Hi everyone,

U just got a 65mm KL lens for my RB67 and I want to find out if it is noticeably better in terms of sharpness and CA than the 50mm C lens, because I will probably not be able to justify keeping them both. I normally forego any kind of testing and just make the photos I would normally make, then form an impression over time. However, if I did want to take some test shots to compare I assume it would be best to focus on an object that is in the middle distance or maybe closer to the foreground? In that case, which of the following would be a more fair comparison

a) focusing on an object a given distance away from the camera (ie not moving the camera between shots)
b) focusing on an object which I would keep the same size on the negative (ie moving the camera a bit closer for the 50mm shot)