I am far from a professional photographer, but I take it as seriously as possible while still referring to it as a hobby. I take mostly pictures of people at events and many of my baby son without flash in low light situations.

I had been using a Nikon D40x for 1 year and very early reached my limitation with that camera. The Nikon D40x has very nice image quality, but the camera's interface is not suited for a more serious shooter who wants quick single button or dial access to such shooting parameters such as white balance, shooting mode, metering mode, etc. I also felt very limited by the D40x not having an in-body focus motor that would allow me to use non AF-I/AF-S lenses (which are lenses without the focus motor built-in).

The Nikon D40x limitations were severe enough that I was about to consider purchasing a Canon 40D until the Nikon D90 appeared just in time.


PROS:

1. Fantastic set of separate buttons on the camera to control parameters like ISO, white balance, metering, autofocus, image quality, shooting mode, etc.
2. Two command dials
3. High resolution 920K pixel LCD screen (like the one on the Nikon D300)
4. 12.3 megapixel CMOS sensor
5. Low noise high ISO capability (for low light shooting) I can shoot ISO 1600 with good image quality with this camera, while on my D40x I could only shoot with ISO 400 and obtain acceptable IQ. I will even use ISO 3200 frequently with very usable results!
6. Separate top-viewing LCD screen in addition to the rear high res screen, to show shooting parameters constantly
7. In-body focus motor which allows the use of Nikon's non AF-I/S lenses, including wonderful and CHEAP prime lenses such as the Nikkor 50mm 1.8 (~$100 lens!)
8. Continuous shooting of 4.5 frames per second
9. Small size, although larger than the D40/D40x/D60, it is still substantially smaller in the hand than the D300/D3
10. 720p 24fps MPEG video shooting capability with incredible ability to use depth of field that I cannot achieve with my Sony High-Def camcorder.
11. Eleven auto-focus points (not as nice as the 51 points on the D300, but substantially better than my D40x with its 3 points)
12. GPS option
13. HDMI output
14. Enormous number of options to customize camera and shooting settings to fit your style of shooting
15. Fantastic image quality right out-of-box if you don't want to do any post processing
16. Terrific build quality
17. Top notch camera ergonomics (but this will be a very personal opinion that differs for each shooter)


CONS:

1. "Rolling shutter" phenomenon while recording video: The D90 CMOS sensor has the same problem that other CMOS video recorders have when recording video. If you move the camera, especially horizontally, you get a "jelly" or "rubberbanding" effect where the image wobbles significantly. It is nice to have the video features, which looks very sharp at 720p, but it is NOT a substitute for a video camera. If you use a tripod, and do not do quick zooms/pans, the video quality is excellent. Without a tripod, however, you may get nauseous watching a wobbly video. The sound is also in monoaural.
2. 1/200 flash synch: Not a problem for me, but it might be for you.
3. No weather sealing: This is found on the Nikon D300/D3 and even on similarly priced models from other camera companies
4. The buffer will fill up after about 8 continuous RAW + JPG (FINE) shots. This number differs depending on the shooting parameters that you will choose. If you shoot primarily JPG, the buffer seems to allow a very large number of continuous shots, but I have not quantified this for JPG only.


TIPS:

1. Get the FREE Nikon ViewNX software from Nikon's site as your 1st step in your workflow. This will let you examine your RAW images that you can process for either Nikon CaptureNX2 to do further RAW processing or just export to JPG or TIFF for a JPG/TIFF editor such as PhotoShop.
2. Recommend buying the Nikon CaptureNX2. It is a RAW converter (if you shoot in RAW) that will read the camera settings properly for export to JPG or TIFF. Capture NX2, however, is not as slick as the Adobe products and Capture NX2 requires a fairly powerful computer, otherwise it can run pretty slowly on a PC > 3 years old.
3. If you use JPEGs out-of-camera, consider increasing the sharpness above the default 3 or 4. Nikon uses a very conservative sharpening default setting. Nikon has also decided to change the default JPEG images to match the higher end D3/D700/D300 cameras which produce more neutral images. Consequently, the D90 images that are less punchy than the D40/D40x/D60/D80, so you may also want to turn up the in-camera saturation and contrast.



The Nikon D90 has all of the interface features that serious and even professional photographers need with wonderful image quality.

There are plenty of reviews out there, and I don't want to be redundant. So here are some helpful points that I had a hard time ferreting out when doing my research before pulling the trigger on this purchase, given that I was upgrading from a D60 and that I am, like many who are reading reviews on this product, not a professional:

1. I owned the D40, then the D60. So this is my third Nikon. I had trouble deciphering how my lenses, purchased for the D40/D60, would behave when used in this new model. The answer is that the D90 handles all of them perfectly. This includes lenses that have the HSM built in (the Hyper Sonic Motor is packaged in the lens, because the D40/D60 range doesn't have a built in auto-focus motor) as well as those with no internal motor. The D90 has an internal focus motor, so all lenses built for Nikon cameras will auto-focus, including the Nikon 50mm f1.8 lens that I had to manually focus in the D60.

2. The D90 is heavier, but certainly not uncomfortable to hold or carry. Weight will not be a discouraging factor in purchasing this camera.

3. The D90 takes different batteries, so any spares you have for the earlier models will not work on it. Battery life is truly outstanding. I am not even going to buy a spare battery.

4. The user interface is completely different from the D40/D60. I found it intuitive however. The functionality is just superb, much easier and more flexible. This is a pro level camera with the ease of use of a high end amateur camera.

5. Live view is a great enhancement. Really.

Overall, there is nothing I can say negative about the D90. It's everything I was hoping it would be, and it's so worth the money to upgrade. I'm selling the D60 for half what I paid - and doing it gladly - because the D90 is worth more than it's being sold for. I absolutely highly recommend it.

I also thought I would offer some lens advice, because I had trouble finding a reviewer that just cut to the chase and said "look, just do this." So, look, just do this: I do NOT recommend the kit lenses that you can obtain bundled with the D90. Get the body only, and buy yourself that Nikon 50mm f1.8 (Nikon 50mm f/1.8D AF Nikkor Lens for Nikon Digital SLR Cameras). It's a no-brainer at the price point, and the images I have already achieved have been just excellent. For the rest of your lenses, I highly recommend Sigma. I own the 18-200 (Sigma 18-200mm f/3.5-6.3 DC Lens for Nikon Digital SLR Cameras), the 10-20 (Sigma 10-20mm f/4-5.6 EX DC HSM Lens for Nikon Digital SLR Cameras), and the 150-500 (Sigma 150-500mm f/5-6.3 AF APO DG OS HSM Telephoto Zoom Lens for Nikon Digital SLR Cameras). I cannot say enough positive things about the quality of the lenses or the images. Pack the 50mm and the 18-200 superlens for normal occasions. If you can stand the extra weight, you absolutely cannot go wrong with the 10-20 for landscapes, it just pulls in everything and the quality is shocking. The 150-500 is enormous, you are not going to want to carry that thing around, but when you need it, you really need it. I captured images of my son playing in a soccer game that blew me away; could not have gotten the shots without the big lens. Get the lenses in the order I have specified if you cannot afford them all.

I have just learned all this over the past 2 years. I am no expert but I have discovered the joy of capturing great images that you just cannot get from a point-and-shoot. I think once you see the quality you can achieve with a better camera, you will be thrilled with the decision to spend the money and the energy. And Nikon has truly produced the best camera at this price point in the world. It's a pro camera with an amateur price and it's very easy to use. Words really don't do it justice; you need to experience it to understand.

Any questions, please send me a comment. Happy to help!

Update - 16 Jul 2009:

I have now taken well over 4,000 images with the D90 and can confirm that it's still all I had hoped it would be. Every time I think of something I wish I could adjust, I find that the D90 has the adjustment capability in the menu somewhere. The active D-lighting is spectacular. The noiseless photos in low-light conditions have blown me away. I don't see myself upgrading from this camera for a very long time. My technique for most situations has become as follows: snap a few images using the Auto settings. Then switch to full manual and start playing with the depth of field by adjusting ISO, aperture, and shutter speed to fit the situation. Half the time, the Auto photos are so good that I can't do much to top them in manual mode!

Update - 20 Jan 2010:

Over 10,000 photos taken with my D90. No new lenses purchased since last update. I have yet to find a situation the D90 cannot handle deftly. Over Christmas, I took a family photo of my wife's entire extended family, over 40 people involved. It was indoors, at night, with only weak overhead lights and the lights from the Christmas tree behind the group. I used an ISO of 3500, my small Nikon 50mm lens at 1.8 aperture, and my remote control (so I could be in the photo too!) Under these low light conditions, with no flash, I was able to capture 50 images in a very short time, and miraculously got several with everyone smiling and no one blinking, and out of these one was perfect! The group included several young kids who hate standing still, to name one challenge! The output was startling; in the natural light, its almost ethereal. I'm the new family hero. The reality is that this single photo is irreplaceable and worth more than the camera and lens. It could not have been accomplished with a lesser camera/lens combination, including the previous Nikons I have owned. I would venture to say that no other camera in the price range could touch what I did with the D90 in this situation. Over and over, the camera proves its worth to me. In the end, what is one fabulous photograph of your child, your vacation, or your life's important events worth?

I think most of us buying D90 would be someone like me. Goto review website for technical review and skip the rest. Read mine if you use it like I do. Here you go. Enjoy!

I have a D50 and just bot a D90. I shoot primary my daughters' school events usually indoor in a gym or threater. I have some of Nikon better F2.8 glasses. With indoor lighting and action such as TKD. The results are sometimes less than satisfactory. When using flash, the subject is well lit but the background would be dim. (you could solve this placing multiple flashes in the GYM like the professionals) when not using flash, you get hand shakes and motion blur. I shot my daughter's TKD blackbelt test yesterday, the D90 blew me away. Here is what it does, on Sport mode with Flash, it selected ISO 1100, F4 and 1/60. subject is well lit, the back kick is frozen to show the form, the foreground and background of the GYM were well lit. The white balance is perfect. I could not have done a matter job myself in manual mode! At the same sport mode, D50 chose ISO 500, F5.6 and 1/60. The subject is well lit, the gym background faded into darkness. When not using flash, D50 just can't get the white balance correct no matter how i set it. D90 white balance was perfect.

The D90 giant colorful LCD really tells instantlly if I have got the shot. I would buy D90 again just for catching the highlights of my daughter's belt test.

D90 is actually the same size of D50. D50 felt more comfortable in my hands initially, but after 3 hrs, the D90 felt just better. It could be a weight issue. I don't know why.

So bye bye to my wonderful D50. Hello to D90.

Further edit:

After a few weeks, it is clear Active D lighting works wonder. It lights up details which are lost when using a Canon 5D without post-processing. I would buy it again just for that. The custom FUNC is also a welcome addition. I set it to open my favorite menus making everything fast. I used to use flash whenever indoor. You don't need to do that in most cases anymore. I shot Halloween at Hollywood Blvd, pictures have good color and exposure using available light. It was unimageable with the D50.

Good shooting!

I just upgraded to the D90 from the D40 because I was tired of futzing with the white balance of the D40, and I wanted more low-light sensitivity (better ISO), as well as the flexibility of using faster lenses, many of which are not AF-S.

I have been very impressed with the D90. I'm comparing it to the D40. It takes significantly better pictures because of its larger dynamic range and better colors (ADR) and better white balance. The things that I think are important are ranked from most to least important.

1. Active D-lighting (ADR). This has gotten me photos with large dynamic ranges of light (highly shaded subjects with a bright background) that I would have otherwise botched. Also, we rent a house where they did a quick paint job in white, but there are splotches of beige and light green underneath. We've never successfully taken photos of this with the D40 or our point-and-clicks. The D90 pulls these out (without flash) to the point where it's easier to see them in the photo than by eye, and it nails the colors! I also suspect that the ADR is helping tame the noise at high ISO levels (see #3 below).

2. White Balance. The white balance is a big improvement over the D40, which botched AWB lots of times. If you look closely, it's not perfect, but close enough for all but the perfectionists, and the beauty is it works in Auto. That means that you can focus on taking pictures and not on fiddling with your settings so much. There's also a lot of flexibility to set your AWB defaults with a lot of precision.

3. Low light photography. I take a lot of shots indoors without flash. Until very recently, there weren't any f/1.4 prime lenses that were AF-S (needed on D40). The D90 helps in 2 ways: a) takes AF-D lenses and b) has better high ISO performance. I did controlled tests using my 55-200mm VR lens at 55mm (f/4) and looked at ISO sharpness and color on the D40 and D90. I did it in manual mode, following the exact procedure of Ken Rockwell (tripod, VR off, remote trigger). I find that the D90 is between 1 and 2 stops better ISO than the D40. D90/ISO 6400 is too dirty, but D90/3200 is pretty usable. With the D40 at ISO 800, the sharpness is slightly better than the D90 at 3200 (but worse than D90/1600), but there's a lot more out-of-control, day-old pizza look in dark sections with the D40 at 800 than the D90 at 3200 (I'm guessing that ADR is helping here). The D90's color starts to fade at little at ISO 1600, and drops more at 3200, then quite a bit at 6400.

4. The 11-point AF has helped get things in focus compared with the D40's 3 spots. AF also feels faster. Autofocusing is a big improvement.

5. I also really like that it's quicker changing ISO, WB and QUAL because of dedicated buttons. I've also set AF as my top choice under My Menu, making it 1 button away as well (hit the Fn button). This was another Rockwell suggestion.

6. The screen is amazing, as others have said. Also, you can navigate a zoomed image on the screen really fast.

7. I'm also looking forward to using my SB600 flash remotely in commander mode (you can't do that on the D40).

8. On the down-side, I've just discovered that some old Nikon manual-focus lenses from the 1960s will not mount on the D90, but they will on the D40. I don't think this should affect too many people.

Another observation: I'm not that familiar with the D300 and D700, but the D90 feels pretty solid compared to the D40. I thought that weight would help stabilize hand-held shots, but I also find that it's shutter is stronger than the D40, and that vibration tends to cancel out its heavier weight in terms of holding the camera still.

For someone who doesn't like to adjust the manual settings very much, the main benefits of the D90 over the D40 are the ADR and WB. These upgrades will probably appear in the D40 replacement in ~6 months. I might wait for that. For others who use their manual settings regularly, this is quite a camera.

Look, this is an outstanding camera. It really is. I think others have probably already expounded on its greatness better than I can so I will keep this review (reasonably) short.

Here are the three things that jump out at me, and I will be comparing this camera to the Canon 5D (full frame) which I used previously to this.

Sharpness: Good god this camera is sharp. To me it is noticeably better than the 5D in terms of definition, detail and sharpness. I have gone back and pulled out similar pictures taken with the 5D (5D with L series lenses) and they are not as sharp. I am a sharpness whore and a pixel peeper so trust me on this. It's amazingly sharp.

Auto Exposure: very good; but not blow me away great. It will take some getting used to and I think perhaps I will have to fine tune it more than I thought I would have to. I'm really just nitpicking here; it's not a big deal and it's not bad; again just not blow me away great right out of the box.

Low-light performance: I'm sorry, but the 3-year old 5D has it beat big time here. I know it's unfair in a certain sense since the 5D is full frame, but as I said I think this camera has it beat in sharpness which is not supposed to happen when comparing a cropped sensor to a full frame. The fact that it wins sharpness is huge. Unfortunately, the low-light performance is nothing to write home about here. It is certainly better than the D200/D80/D70/D60/D50 (all previous Nikons I have used) but noticeably worse than the 5D. I'm not sure if Nikon was marketing this camera as a good low-light performer like the D3 and the D700 (I don't pay much attention to the marketing stuff) so this might not be a detraction but I just thought I would mention it since people care about low-light performance more and more these days. Of course also I am speaking from the standpoint of someone who has to market/sell most of my pictures. I rarely take pictures for fun unfortunately. I am quite sure that for anyone not using the low-light feature for professional work intending to be sold, it will be more than fine. Frankly it will even be fine for some professional work at ISO 400-800 but nowhere near the level of competence of the D700/D3.

Bottom line, in most situations this camera is superior to the 5D which really is saying a lot since the price is half and the sensor is cropped. At the end of the day, however, if low-light performance is key to you then I would recommend the Nikon FF D700/D3 or the Canon full frame offerings such as the 5D.

I haven't used the video feature yet (and probably won't for a while since I bought this to take pictures) so I don't have anything to report there.

Ergonomics are great and battery life is awesome.

Overall after shooting a few thousand pictures with it my rating would be 92-95/100. Again please take any of my seemingly negative opinions as what they are--my attempt to be thorough because I know some people want to know the finer points of some of these issues and I don't like writing reviews that just say "I love this camera" or "this camera is great" and that's all.

I do not have a negative opinion of this awesome camera by any means at all and I would recommend it wholeheartedly to anyone looking for a pro-sumer DLSR around this price range. Definitely superior to the 40D in my experience and from what I read it is probably superior to the 50D also, but I have not personally used the 50D yet (and don't plan to) so I can't say that for sure. But anyway yeah, if you are comparing this to the 40D then get the D90 unless you have a bunch of nice Canon lenses and don't want to switch them all over to Nikon.

After reading recommendations here as well as heeding Ken Rockwell's advice, FINALLY, after several years of indecisiveness between the Nikon D80, D200 and D300, the D90 really stood out for price/performance - I made the plunge. I paired this D90 with the Nikon 18-200 mm lens and the Santechi LCD battery grip, as well as a Delkin silicone body skin and a B+W UV multi-coated filter as well as a Nikon SB-600 speedlight flash. Every part of the camera and lens is now fully protected. ( A slight bit of trimming on the Delkin skin was necessary, along the bottom of the skin, so I could put the LCD battery grip on. Delkin states you can't put a battery grip on with their skin. But if you trim a bit of the skin then it fits perfectly! So no worries there. Get the Delkin skin. It is well worth it!) As a complete unit, it functions beautifully. Speaking about just the camera here, it is ridiculously easy to use, very intuitive, a well thought out design, well balanced, with enough heft, yet light enough for all that it offers. The pictures rendered, and the bright, 3" LCD screen on the back of the camera makes it wonderful to use. The menus are thoughtfully laid out. As for the video mode, it works just fine with the Nikon 18-200 mm lens. Best used in video mode for fixed distance videoing. I vidoed my future son-in-law fishing waist deep in a local river. The video came out excellent. Remember, this is a camera first. Not a video cam. But having the video option is nice, as you have everything within one camera body. This camera is certainly worthy as a semi-pro entry; maybe even as a back-up camera to a Nikon D3 or D3X for a professional photographer. I think the D40 or the newer D5000 would be a better choice for light users who want a few more features than a simple point-and-shoot camera, but who have no intention of really delving into photography and learning all the terminology and techniques involved in lighting, exposure compensation, picture composition, etc. But, if you are serious about photography and want room to grow, or you are a photo enthusiast, semi-pro or pro, you would be hard pressed to find a camera with a better price/functionality point. I purchased my D90 through Amazon via J&R Music, as they had the best price and had the D90 in stock. I received the camera a day after the order was placed. In less than 2 weeks I had taken nearly 1700 shots. I have taken early dawn, early twilight, late night, portrait, nature, time exposures, double exposures, and sports photos in that time. It is nearly impossible to take a bad picture with this camera. It is easy and a pleasure to set up. Once you take the necessary time to learn the camera and all that it can do, you will understand what a joy it is to own this camera. I highly recommend visiting the KenRockwell.com site to become well-educated on photography in general as well as getting a crash course with a simple, no-nonsense approach regarding the workings of the D90 -- well beyond all the sometimes useless and verbose language the Nikon manual for the D90 employs.
Bottom Line: The Nikon D90 is nearly impossible to beat right now for the price/function point. TIP: Invest in high quality lens/lenses as it/they will do more for you than the camera, as far as giving you quality pictures. Great pictures are more about proper lighting and exposure than the camera or the lens. Those things merely make it easier for getting that great shot. The photographer is responsible for the composition of the shot. Learn the proper way to compose and you will be well on your way to productive and enjoyable photography!

Many people have bought the Nikon D90 thinking of it as a Hi-Def camcorder first and a camera second. However, if you want to be happy with the D90 it's better to think of it as a best in class APS sized sensor DLSR which happens to have a movie mode.

(To explain that, most DSLR's have a sensor smaller than 35mm as sensors get more expensive the bigger they go. Nikons and Canons have one roughly the size of the 1990's era APS film cameras, hence the term. Several newer and more expensive DSLR's have sensors that are equal to 35mm.)

The D90 has substantially better high ISO noise performance than it's predecessors, all the way to ISO 3200. From some test photos I've seen the D90 even outdoes the D300. It is fast, responsive, has the new generation LCD that is clear and easy to read. In general is in every way an improvement over the D200 I used previously except for the inability to meter with manual lenses. That is an issue for me, but probably not for most people.

This shouldn't be confused with full frame sensor cameras like the D3, D3X, and D700. I have the D700 and the difference in performance is like a Corvette to a Mazda, the D700 also costs a few times as much.

The movie mode, which got most of the excitement, is both amazing and disappointing. Amazing because if you own a lot of lenses suddenly you can do things that used to take a serious pro movie camera; such as truly wide angles, narrow depths of field, and very low light shooting.

It's disappointing because it's nothing more than capturing the live preview. There's no settings to speak of, no external microphone pickup, and as many people have pointed out any motion causes the image to "wiggle" on the screen. This essentially makes it useless for handheld movies, which I bet a lot of people were planning on using it for.

I also found a lot of gradient changes (shifting noticeably in steps from light to dark) if you pan around in areas with a lot of contrast, like looking from inside a house to outside the window, even on a cloudy day. You can program the AE-L button to freeze the exposure, and that does help a lot.

Despite my misgivings the movie mode has a lot of potential, just it has to be treated like a "pro" movie camera; mounted on a tripod and having shots planned out carefully.

As a camera, like I said it's the best APS class Nikon so far, I only wish it could meter with manual lenses.

Just wow. This is my second Nikon DSLR and a big step up from my fine D-70s. The D-90 is about the same size and weight which is important if you're holding this camera throughout a busy day. The focus is fast and accurate in most cases. The d-lighting is a nice feature for compressing highly dynamic lighting. Shooting 4.5 frames per second is wonderful. The rear screen is sharp and bright. The ability to shoot 720P video is nice but is limited by a lack of automatic focus. The resulting video is very sharp as the DSLR's lens are bigger than anything short of a professional video camera. Nice for an occasional video but not a full replacement.

I received the D40 last year, and while I enjoyed it immensely I was ready to upgrade for more creative control. I ordered the D90 as soon as it was available, and I cannot say enough good things about it! The pictures are incredibly sharp, clear, and Nikon colorful. I have gone as high as ISO 2000 with no recognizable noise (unless zoomed in). Even at ISO 3200, it was comparable to my D40 at ISO >800. I loved my D40 and still think it is a great camera for someone who is just starting out, or for use as a 2nd lightweight camera, or who wants something a little nicer than a point and shoot but still really simple. However, once you are ready for more, this is the camera to buy. I have already used the video recorder several times, and while it isn't going to replace your video camera altogether it is wonderful to have. It is great for the quick video shots, such as at little league baseball -- I don't want to film an entire ball game, but it's nice to have video of my son when he is batting. (The sound of the crack of the bat just can't be captured on a still!) So I have been getting great stills at games as well as fun batting videos and end of game celebrations. Also, I have used it at school programs, at the moment when my son is reeling in a fish, at special moments at the zoo and park, etc. Some people may think it's just a gimmick for a serious shooter, and I probably won't use it when I am out seriously shooting. But it's great to have for the user who also has a family and wants to use it to capture memories in their everyday lives. And that's why I think it's brilliant. I can't think of any other purchase that I have made in recent years that has as much versatility and opportunity for use as this camera. Plus, as previously mentioned, I am absolutely thrilled with the photographs that it is producing, and that's what really matters at the end of the day. If you're thinking about getting it, just do it! You won't be disappointed!

I bought the D80 a couple months ago and was having major noise issues. My Nikon D50 (a lesser model) took better quality photos. After exchanging the D80 several times and even sending it in for service, the issue still remained. I was so fortunate that the D90 was released this week....I have already exchanged the D80 for the D90. After using it for just one day, I am amazed at the quality. I took photos at ISO 3200, and they are nearly the same quality as the D50 at ISO 400. Nikon has finally solved their noise issues!!