The K10D was Pentax's flagship 10MP Digital SLR until it was replaced in 2008 by the K20D. At the same time, the K200D was released, a mid-level 10MP camera with similar features as the K10D, but it was intended for a less professional market. Although the K10D can be purchased inexpensively on closeout or used, most people will prefer the K200D.
Similarities
Both cameras have weather sealing, which protects the camera from dust and light rain, especially when used in conjunction with certain lenses. If dust does get onto your sensor, both cameras also have dust removal systems.
They each offer in-camera shake correction, which means that every lens you mount on the camera will have this feature. This is particularly convenient on a Pentax DSLR, because they are compatible with all K-Mount lenses made from 1975 onward in manual focus mode, and even on older M42 lenses with the right adapter. These older lenses are of high-quality and a great value.
Also, both models have an extra readout on top of the camera.
Advantages of K10D
The K10D is a higher-end camera with some features important to professional photographers. The camera is a little bigger and has more buttons instead of relying on dial menus. The K10D has a nicer "pentaprism" viewfinder, and a larger buffer for faster and longer continuous shooting. The larger buffer allows for unlimited continuous photos in jpg mode, whereas the K200D can only take four continuous photos.
Advantages of K200D
Although the K200D has a poorer viewfinder, it has a slightly larger LCD screen, 2.7" inches as opposed to 2.5 inches on the K10D. The K200D is powered by AA batteries, which is an advantage if your batteries run low and you need to pick up some extras at the drugstore. Surprisingly, the AA batteries provide longer battery life than the proprietary battery on the K10D. Both cameras offer an optional battery grip if you need more battery life, but the K200D's battery grip is cheaper.
Different Uses
The K10D seems best for professional photographers who shoot one-time events like sports and weddings, and would therefore require good continuous shooting, easy access to features and a nice viewfinder. The K200D seems best for tourists and backpackers who want a lighter unit that has the convenience of AA batteries.
New vs. Used
As the K10D has been replaced by the K20D, it is likely that you will need to purchase a K10D used. This introduces its own problems as you must trust that the seller kept the camera in good condition, because there will be no warranty. As you can still easily purchase a K200D new at a similar price to the K10D, this makes the K200D a better investment.
Tags: battery grip, battery life, camera with, continuous photos, continuous shooting, larger buffer, older lenses
