As a Pentax shooter, I will have to disagree here. The amount of old Pentax glass floating around is incredible- someone on here once described it as "an embarrassment of riches." The K mount goes back forever, and therefore so does Pentax lens availability. If you are limiting yourself to lenses made in the last three years or AF lenses only, the big two probably come out on top, but who only uses AF lenses? The OP may, of course, be one of these people, but overall I think it is important to point out that there is a ridiculous amount of excellent glass floating around that will mount right up to my K100D, much of it older than I am. I am not sure about other brands, I am sure some have limited availability of used gear, but I do know that Pentax is definitely not one of those.
It's all relative. There's still far more used Nikon, Canon, and even Sony/Minolta glass out there than Pentax. Go search on
KEH.com and you'll see. And the local pro shop is usually loaded with used N/C lenses, but just a small corner for other stuff. I think it's safe to assume that most newcomers are going to be sticking with AF lenses, and Nikon has a 10-to-1 advantage there vs Pentax. 27 pages of listings vs just 3 for Pentax on
KEH. One lens I'm looking at for Nikon (an 80-200 f/2.8 telephoto zoom) there are 2 pages of listings just for that lens alone. I didn't see any Pentax f/2.8 telephoto zoom listings at all. That's what I'm talking about.
I really think the OP is poorly served by listening to those who believe Canon and Nikon are the only brands that matter.
The market collectively already kinda sorta decided that Canikon are the only two brands that matter ages ago. Don't ask me why, but that's the reality of the market today. There's Canikon, and then everybody else. You also get far better aftermarket support with Canikon with third party lens makers. They all make their lenses for both Nikon and Canon, but commonly not for the other systems. If you decide you want a full professional DSLR, Canon and Nikon both have multiple options to choose from vs zero from the other systems. And you'll still be able to keep using a lot of your lenses and accessories as well and won't have to re-buy. 5 of my 8 lenses will work 100% on a full-frame FX Nikon DSLR.
If you've got a collection of old Pentax lenses that you can use, it certainly makes total sense to buy into the Pentax system. I didn't. Or if you
know you're never going to want to step up to a full professional DSLR and professional lenses and just have basic needs as far as lenses, it certainly makes more sense to consider the other systems as well. I can't say that either.
Personally I'm a fan of underdog companies, but none of the other systems really stood out to me. Are they pushing some groundbreaking revolutionary new sensor? Nah. Are there some incredibly unique lenses that you can't get within Canikon? Nah. Is there some huge value, feature, or functionality that they offer? Nah. Actually Nikon led the way on D40 pricing for awhile. I really wish one of these companies would take some risk and come out with some revolutionary new sensor technology to get people excited, like this Kodak sensor I read about awhile ago that didn't use Bayer interpolation and gave far greater image quality than a lot of what was on the market. Or how bout some dedicated black and white DSLR with just a sensor, no stupid color filters, and no stupid Bayer interpolation once again? The sensitivity and dynamic range would be HUGE. Swappable back consumer level DSLR where you can swap in different sensor backs depending on what you want to do? There are risks these companies could be taking that have the potential to really let them stand out, but instead I think they're all just playing it safe and trying to stay in business. That doesn't get you noticed, unfortunately.
Anyways, I'm sure this thread will be locked now. :mrgreen: