Originally posted by biz-engineer you get soft corners, which is ok to post images on the web, but certainly not up to full frame image quality standards. You can also use apsc lenses on a medium format camera with some sort of adapter. There is a reason why Ricoh classified lenses good for full frame and not good for full frame. I was recently at a camera shop , we discussed a medium format kit, the guy told me "you can print 2 meters wide with a smartphone image, you don't need medium format". His statement is correct, you can print even 10 meters wide from a smartphone image, it's not illegal.
With all due respect, that is not right. I take my DA 55-300 on long trips just to save weight?
The other day in Algonquin...
How are these soft corners in anyway objectionable or unprintable?
This being a 26 MP file. Cropped the same way on APS-c it would be 15 MP. The benefits to using APS-c lenses on FF are absolutely undeniable. And in situations like this, using the same crop you'd use on APS_c will give you 50% more resolution. You may need to be bit more judicious in the type of image you take, but APS-c lenses can be quite valuable on FF.
You may have to be a bit more selective in where you use the lens for what type of image, but there are scenarios where an APS-c lens makes more sense. The lens doesn't care what forms it's on, I don't either as long as it does what I want. And there are many scenarios where it does exactly what I want.
Any photo that uses a subject away from the edge and uses out of focus backgrounds to achieve subject isolation can use APS-c lenses as long as they cover the image circle without vignetting, because edge sharpness isn't part of the shooting strategy.