Hi, Am 23.02.19 um 16:34 schrieb Florian W: > Thanks for your answers guys. > > Simon, I'm curious to know why to you it's not the best idea ?
(oversimplifying it a bit) Full-frame lenses are designed to deliver their full sharpness across the whole full-frame image circle. If I put a full-frame lens on my APS-C D7100, I am basically expecting it to deliver 24 megapixels within the smaller APS-C image circle the sensor is cropping out. That means I expect the lens to deliver about 24*2,25 = 54 megapixels over the whole full-frame image circle. Which not that many standard lenses will do. If put my standard 24-70/2.8 on a Nikon D850 and (let's say) it only delivers 40 megapixels of actual resolution instead of the ~46 the sensor wants, that's not going to be a catastrophe. If I put it on a camera with a lower resolution sensor, e.g. the 24 megapixel sensor in the D750, there is zero problem. But if I put the same lens on the D7100, the cropped area will only get around 40 / 2,25 = 17 megapixels. That's suddenly 30% less than what the sensor needs. And not every lens will even deliver these 40 megapixels. Good APS-C and especially Micro-Four-Thirds lenses are expensive and hard to make because they have to be very sharp within the smaller image circle. Prime lenses are usually sharper to begin with, so with your 50/1.8 and 28/2.8 it might not be that much of an issue. But I can clearly see the problem with my 24-70/2.8, and especially with the good old 70-300/4.5-5.6. cheers, Simon ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org
