Originally posted by narual Somehow, I don't expect there's any magical characteristic of the FF camera vs the crop sensor bodies which is going to suddenly make this difference disappear.
I am not expecting 'magical' benefits but I am expecting benefit. Firstly, I make the assumption that my fast legacy glass (good stuff) is not meant to be shot wide open (but can be if need be). BUT the big aperture does enable opportunity to improve focus accuracy. The FF will have a bigger view to enable manual eye focusing AND the AF confirmation will be better than say the K-3.
Taking my first assumption a step further, I will probably refrain from shooting wide open, rather, shoot at the limits of the AF (i.e. f2.8). Here I get the benefit of manual visual focus and AF confirmation through the bigger aperture, AND, the benefit of CA/ fringing dissipating with each stop down setting (i.e. f2.8 +).
Lastly, I do think there will be resolution benefit. Legacy glass optics were tailored to FF format. Shooting FF lenses on APS-C has possibly enhanced the 'flaws' of the associated optics. In this respect I have seen considerable difference in lens performance between the APS-C and FF (Sony A7r). The FF camera I have recently used showed me that my FF lenses will actually perform better - with perhaps the biggest disparity evident in the SMC Takumar 35/2. ON APS-C the SMC Takumar 35/2 produced wicked light blue teal CA (yuck and hard to correct) but was considerably/ significantly less on the Sony A7r.
As monochrome points out, the price point of this legacy glass has over the last few years been pretty good. Many prime lenses can be had to the price of a single modern zoom. Ultimately I am happy with that equation too.
Last but not least, if it turns out that I was completely wrong then cool, still happy with the quality I get with this legacy glass AND I am a avid collector anyway and gain much satisfaction with this activity - as I am sure everyone does. IN this respect I am not afraid of being proven wrong
All differences aside (Legacy versus new) I think we will all be happy to have the ability to slap on some old glass from time to time for nostalgic purposes.