Good points:
Big Live View viewfinder and detailed screen
First DSLR with movie mode
4.5fps shooting & 11-point AF
Great handling and ergonomics
Fair Priced

The Bad:
Resolution not a big step from D80.
Remote & RAW software costs extra.
Video Recording needs lots of storage space and is limited in length to protect the CCD chip.
No Autofocus during video recording.
It is a SLR camera, therefore it does not fit in your pant pocket.

For Whom:
There’s no doubt the D90 should be short-listed by anyone shopping in its price-bracket, and should its features match your requirements, you’ll be very happy with it. Existing D80 owners should however think very carefully about whether it really offers them an upgrade, or whether stretching to the D300 – or indeed waiting – is a better bet. The Nikon D90 is a great gift for anybody who wants to seriously start taking high quality photos with SLR technology.

For beginners in photography, it is highly recommended that you read a lot of books and take a lot of pictures before you begin your search on the internet. This will give you a good knowledge of some important things such as the lens, focus, and face detection, whether to use digital zoom or optical zoom, find out the ISO sensitivity you need for different shots along with the lighting, stabilization features, and the mega pixels you need for a particular project.

Many digital SLR cameras are as cheap as ordinary cameras. But most of these models do not come with all the key aspects like dust control and image stabilization, do not, however, disregard these cameras for those reasons as they do also produce high quality images. These are especially good for beginners.

So, when you want to buy a cheap digital camera, don’t just go for the first thing you see that is a well known name brand. First look at the specific details like the ISO sensitivity, mega pixels, zoom functions and more to make sure that you are getting the quality you want, and also be open to some relatively unknown name brands because if you find the correct specifications, you may get a cheaper camera that is still of great quality. Also look at lots of digital camera reviews and price comparisons from various online and offline sources. Then do different online shop to find the best for you.

Olympus was the first camera manufacturer to install dust-reduction technology in its DSLR cameras, with a special Supersonic Wave Filter (SSWF) system that vibrates the filter in front of the sensor to dislodge dust. The dust collects in a tray below the sensor, which is cleaned when the camera is serviced. Other manufacturers have followed with similar systems - but they may only be included in one or two models.

Some manufacturers combine the vibrating filter with anti-static materials in the camera’s mirror box, while Canon adds a Dust Delete detection/removal system via software. Only Canon’s system deals effectively with dust that becomes ‘welded on’ when a camera with dust on its sensor is moved between low and high humidity.

Listed below are a part of the latest digital SLR cameras that include dust control systems.

Camera with Image stabilization option and ability to handle high ISO is essential. Camera should be responsive and auto focus must be fast and accurate. Lenses with a large maximum aperture of f/2.8 or larger are extremely valuable for weddings. The wide-angle zoom lens makes it possible to photograph in confined spaces, such as the bride’s dressing room or a packed dance floor. The wide-to-tele lens is wide enough to take a group photograph, but still long enough to take a three-quarter portrait of a couple without the unflattering effects of wide-angle perspective distortion.

Flashes and Accessories

1. 2-3 500-800 w/s monolight heads
2. 2-3 “speedlight” on-camera TTL flashes
3. light stands for each flash
4. umbrellas/softboxes for each flash
5. flash triggering device (radio slaves, optical triggers, or PC cords)
6. hand held flash meter

Wedding photos are a challenge to take, simply because of the flurry of activities that go on and the wide variety of lighting conditions that may occur.  But do remember that while wedding photos are challenging to take, they can be very rewarding. Especially when you see the couple smiling and reminiscing about how wonderful their wedding day was.

Nikon D80 or Canon EOS 40D，the truth is these two are not at the same level comparison… Canon 40D is at the better level and I should really be comparing to Nikon D200 or even D300. Although Canon 40D is a little expensive, but it really has some features that Nikon D80 doesn’t (There will be other differences but these are just a few):

1. 6.5 and 3 fps continuous shooting (D80 has 3fps only).

2.  14 bit files (D80 has 12 bit)

3.  Live view and live view simulation (more useable than the D300; D80 doesn’t have this at all) - great for macro and landscapes

4. Low noise and good definition at all ISO - considerably better than D80. The Canon EOS 40D stands up well against the Nikon D80 in terms of noise when both are using their default image settings and best-quality JPEG modes.

5.  Custom settings, c1,c2 and c3 (not on the D80) - very useful to set up and switch between different types of shooting

6.  Free software - DPP and EOS Utility being the most useful - also zoom browser, very handy (you would have to buy the Nikon software separately if you wanted it).

VS

Another thing that is nice about Canon is that your non-DX lenses (like the 10-22mm and 17-55mm) can be used on a crop camera like the 40D and later on a full frame camera like the 5D. The 5D has its limitations but at roughly $2000 it is much more affordable for many photographers than the $5000 full frame D3 from Nikon.

The 40D is a relatively recent camera but that is not true with the D80. I would expect Nikon to produce a replacement for the D80 sometime this year that is closer in performance and features to the 40D, and maybe even better.

Clearly, Sony A350 has advantages on Megapixels Resolution (14 VS 10). The A350 features a breakthrough Live View function that offers straightforward and easy-to-use image framing and auto-focusing with the rear LCD panel. What’s more, the display alternates so that you can get up high or down low without straining your neck or getting on the ground, the articulating LCD and Live View function work quite well together.  In fact, these features set the Sony A350 apart from other entry-level DSLRs, including the Nikon D60 and Canon Rebel XSi. The A350 also feels great in the hands.  It is bigger than Nikon’s D60. But the A350 is still a compact DSLR.  The rubberized grip is most welcomed and helps the A350 to feel secure in your hands.

But if you ask my choice, I would go with Nikon D60. Continuing the Nikon trend of small, compact and cost-effective cameras, the D60 offers some minor upgrades over the D40x. I think Nikon D60 to be the most reasonable priced for the features it has. Good image quality, good sensor size, a huge array of available lenses and a sturdy body design. It has not many hidden frills, but many nice clear options. The most attractive features are a dust control system that includes an airflow control to blow dust away from the sensor and improved autofocus. Nikon D60’s kit includes a vibration reduction (VR) lens for clearer photos in low-light conditions. What’s more, I would trust Sony on the point & shoot cameras, but for digital SLR cameras, I would suggest Nikon or Canon, as Canon and Nikon are the top camera companies and the choice of professionals. And Nikon has more available lenses and accessories. If you ever plan on going further with your photography Nikon will have the pro model cameras and lenses you will need.