Originally posted by thibs
I said there would be stupid price arguments, here's one.
So, buying the Canon or Nikon lens is alright but buying the Pentax one is not because Sigma and Tamron can sell you the same (uh... NOT) lens at half the price.
Again, you wish for FF but you won't pay a dime for it.
And we moan because Pentax users are cheap. No wondeR.
Me I don't want FF... I'am too affraid it mean bigger optics. And the biggest problem of 70-200 for me is the size. I'am almost happy with what I have. I'am also invested in APSC and I would need to change half my gear. That's at least 4000€ to spend for an FF setup. Not worth the trouble.
As for engineering, I'am sure you can have good lenses for a bargain, I don't see any justification to spend more to milk Canon, Nikon or Pentax. I may finally buy one, but it doesn't mean I think the price is fair. I don't at all think Canikon is more justified than Pentax.
Realilty is that with some volume you could have better quality lenses like thoses Canon 70-200 for 500$ if they would sell it in huge quantity. This is exactly what happened for phones. In the end price are high because they are marketed as such (as the high end lenses) and because at this price & weight, almost nobody buy them.
Sigma/Tamron made a middle ground offering your high quality glass, maybe a bit less quality in term of AF or ultimate picture quality... And that the whole argument to spend twice the price. I don't think this is worth it.
I mean there always better and we all know that for ultimate quality, MF is better than FF... But most do not consider MF because it is too expensive. Some consider thoses 70-200 from Canikon not really because they give a huge difference toward the latest sigma, but just because it is still in their acceptable price range. They can throw the money and have a marginally better product. That's a way of thinking. That by no way the only way or the ultimate deal one can have in photography !