Hi.. I have been thinking of upgrading. I have the kit zoom lens, pancake and Helios MF lens. Been looking for fast zoom lens or prime and think the price is hi! As size is no longer a concern, I wondered if TCO of dslr is lower given cheaper AF lens and wider range. I am not keen on MF.
And I am confused whether AF lens for pentax, canon and nikon are interchangeable. And read somewhere that old lens can't be used on some models?? I see adverts of used 50mm F1.x lens for <$100. are these MF?