Originally posted by mgvh @Lowell: This thread was instigated because I was just not getting sharp images using LiveView and my manual focus A50 f1.7. I was also getting inconsistent results using Catch-in-focus. The lens is certainly fine and has rendered deliciously sharp images, but I'm trying to standardize my technique to get those consistently. I had tried to eliminate user errors in terms of vibration, shutter speed, etc. by using a tripod. The issue is the best technique for focusing. I kind of knew that CIF was a bit of a gamble whether one catches the focus on the way up or down while focusing. I had hoped, however, that using Live View and magnifying the screen all the way up to 10x would be the best solution, but it wasn't working for me. (It does seem to work best for macro shots, however.)
What is turning out to get me the best and most consistent results is simply using the viewfinder, watching the green focus lamp, and finding the middle of the small range where it indicates it is in focus. And I guess that's where the practice part comes in...
understood and forgotten through the course of the thread.
What I have found using my collection of 40+ MF lenses is the following, related to focus accuracy and the camera's AF confirmation.
Precision of the AF confirmation is inversely proportional to focal length, for example my tamron 200-500/2.5 is only in focus when the green light confirms it is. my 8mm fisheye is always in focus
the system just can;t easily distinguish true focus when lenses have a large depth of field.
With the exception of the 200-500/5.6 which is used on a stock K5, all of my use of MF glass is on 2 bodies my *istD with a Dual split image, and my K10D with a single diagonal split image. I rely on the split image more than confirmation for focus, although I do pay attention to both. you can usually see a perfect split image and move the focusing collar both directions and still have the confirmation light on in the viewfinder.