Originally Posted by Aeonus
You may want to look at DSLRs with a crop sensor, because it adds an optical multiplier to effective focal length. For example slapping a 300mm lens on a Canon EOS 20D results in 480mm focal length. Also, a crop sensor camera can manage with a less expensive telephoto lens because it only utilises the central area of the lens, not the sides, so the lens quality requirements aren't as massive.
I'm not saying anything about the crop sensor optical multiplier vs. a full-frame DSLR with more megapixels, though...any ideas? I usually think optics > cropping.
Well I currently have a Canon XT with a sigma 100-300mm (cant recall max aperture), and I also have a Pentaz k-100d with my longest lens being a manual focus 200mm with a maximum aperture of 2.5.
Im not sure if either of those cameras have any ability to digitally zoom, but I doubt it.
I could alwasy accomplish the same thing later with cropping.
I also just remembered I have a 2:1 teleconverter for the pentax, so I could make that 200mm into a 400mm, although Im worried about how much the effective aperature will be effected.
Id like to be able to shoot in somewhat low light.