A digital SLC digital camera is presented by a bewildering array of options. They may be of different models which are almost 34 according to the number of manufacturers. This article shows some essential factors that should be considered when getting the camera.

Factors to consider when buying an SLC digital camera

Lens compatibility

Lenses like Canon, Nikon, Pentax, Sony have their DSLR are fully compatible with lenses used to focus film-based SLRs. Most Nikon manual focus lenses will not mount on most Nikon DSLRs, and most Pentax bayonet mount lenses will mount on Pentax DSLR, so for those systems that there is good compatibility with older lenses. The use of optical adapters lowers the quality of the image to be produced hence the route is not recommended. If you are considering to use 3rd party lenses such as those that are made by Sigma, Tamron and Tokina, make sure that the lenses you are interested in are available.


This is a major factor in any camera purchase decision. A buyer should be able to balance the budget between the camera and the lenses. Currently, the prices range around $400: Nikon-d40 kit and Canon-rebel -black, to a high almost $8000.

Size and Weight

Price tends to go hand in hand with size and weight, with the lightest and smallest camera being least expensive. For example, the 10MP Olympus-e420 is 130mmx91mmx53mm and weighs just 440g.Whether size and weight are important depends on your application. No DSLRs with a lens is small enough to fit in a jacket pocket, so small differences in size and weight may not be a big issue if you are carrying around a camera bag anyway.

Pixel count

The pixel count of currently available DSLRs ranges from about 6MP; Nikon-d40 kit to 22MP. If the image is viewed from up close you might need 300ppi, or if it’s viewed from a slightly greater distance you might not see any real difference at 180dpi, but 240ppi is a good number for a high-quality print viewed from a natural viewing distance.


All current DSLRs can achieve excellent focus on a high contrast static subject in bright light, but they may vary in performance when trying to get a focus lock or tracking focus on moving low contrast subject in dim light. DSLRs also vary in the number of AF zones comes in at least two types; cross and linear. The cross types are better since they can focus on both horizontal and vertical (detail). Linear AF zones can only focus on detail in one direction.