Re: Sony A77 and A65 and Nex-7 Announcements Today
It\'s difficult to make a direct comparison as an APS sized sensor puts a *lot* more strain on a lens compared to 135 FF. If we take the example of 24 MP.. that\'s ~6000 x 4000. On a FF that\'s (6000/2)/36 = 83.3 lp/mm. On ASP-C that\'s (6000/2)/23.4 = 128.2 lp/mm. A very high quality lens can perhaps deliver 50% MTF at 80 lp/mm. At 130 lp/mm you would be thrilled if you could get 30%. And very few lenses can do that.
Of course this applies to all spatial frequencies - you take a hit in micro contrast as they increase. Add to that the need to use wider lenses to get the same angle of view and you take another hit in terms of image quality. There are many individual exception but as a rule image performance is proportional to focal length - it\'s much easier to build a high performance tele lens than a good wide angle.
Aug 24, 2011 at 03:47 PM
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