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Originally Posted by janoskiss
Why do the Pentax seem less popular than Canons and Nikons with similar specs?
I am only dreaming at the moment, but if I did get a DSLR it would be for astrophotography.
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Steve, the canons are considered to have the best and biggest range of quality lenses available, also the canons have the CMOS type chip instead of the CCD chip - which is considered superior in low noise and sensitivity in long duration exposure astro stuff, or was? - dont think that is the case now?. Also the canon RAW mode is/was? considered the only true RAW mode out there - RAW mode means zero compression - so it can be manipulated and cleaned up more post imaging(Nikon got into hot water about theirs not being a true RAW mode at one stage) but seeing a lot of people just using jpeg mode with great results - i dont know anymore. Also the canon 20D is prized for the fact that the amp shuts down on long exposures - and as a result you dont have to remove the noise/glow it makes.
With adapting older style lenses there can be issues with back focus and autofocus i think? - pity coz we have some great old K- mount pentax/tamron prime lenses i would like to use from our old pentax manual 35mm film cameras.
I read in Covingtons book that he thought some of the best astro prime lenses were made in the 70's and i think that included some pentax ones.
Also canons image stabilisation on board software/lenses are considered the best and cutting edge at that job (not that that has anything to do with astro work - but bird/action photogrphers love it - dont even need a tripod with telephoto lenses) - also the thing with digital cameras is the proprietry on board software differs in quality - nikon and canon are considered the best in that area - or so I believe - that may be out of date info now.
but with daylight shots there is very little diff between the brands with cameras of equal quality.
kearn