Here's a related, yet unrelated question.
In my experience with computers, I would believe that one day ASP-C will become a sort of obselete technology. If not totally obselete, I do think that full frame cameras will become much more afforable in say, 5 years.
Now I realize I should be buying my tools for now, not for 5 years rom now. In 5 years I will likely be able to afford much nicer lenses then I am scrounging for right now anyways! However, something rubs me the wrong way about buying an ASP-C optimized lens. I realize the quality/price and size advantage, but considering how well my manual film lens works on my digital body (I assume by cropping the lens, I am cutting out many of the quality issues at the edges), I am hesitant to invest too much into something that may be rather fustrating on a full frame sensor.
I went with pentax for reasonable quality at a fair price, and I am very satisfied as such.
So if I see a sigma 70-300 lens for 300 ish that is compatible with full frame cameras, and a pentax xx-300 lens for 300 which would only be good for an APS-C sensor, what reasons would I have for buying the potentialy obselete version, assuming neither are top quality anyways.
This is assuming they are the same price. I understand then pentax costs a little more. But the used market may even the playing field there.
PS Both of those shots look incredible, but I think it has more to do with you guys than the lens
.