photo5 Posted April 20, 2007 Share Posted April 20, 2007 My F3HP has a very slight focus error at infinity. It focuses very slightly past infinity with my 35-70mm zoom (noticeable at 70mm), both my 50mm and 55mm lenses, both my 85mm lenses, and my 105mm lens as well as my 70-300mm ED zoom. I have 3 screens, the original K screen that came with it, an E screen, and an R screen that I recently installed to replace the E screen. With the R screen, having the split image rangefinder in the center of the viewfinder, it is easy to see the error when I focus on a tree at the top of a hill about a half mile away from my home. I have had the camera professionally overhauled since I bought it two years ago so it is in excellent mechanical shape and works perfectly. I did some research on photo.net and came up on a couple of possibilities. The finder can be shimmed to adjust the body focus, or the lens mount can also be shimmed. My slides and prints all look sharp to me. I try to compensate when I shoot at infinity and not focus past infinity. Is this something anyone else has run into with the F3? If so how have you corrected it? Thanks, Dave Link to comment Share on other sites More sharing options...
bruce_rubenstein Posted April 20, 2007 Share Posted April 20, 2007 If what you see in the viewfinder matches the film out of the camera, then don't worry about it. The way to check the focus is to use one of the focus test targets and see if the camera front or back focuses. When you shoot the targets, use the largest apertures that he lenses have and make sure that your exposure is accurate. Link to comment Share on other sites More sharing options...
fred aspen Posted April 20, 2007 Share Posted April 20, 2007 Dave, I have seen this anomaly with a number of cameras and lenses of various brands. Some are slightly long, some are slightly short and some are right on. However, in spite of the differences I have not noticed my negs/slides are affected by this small error as depth of field very easily takes care of the differences. The error can occur with both bodies and lenses. I wouldn't worry about it if the results are okay. I quit worrying about it years ago unless it is a serious problem, i.e., infinity focuses at a much closer distance. Link to comment Share on other sites More sharing options...
fred aspen Posted April 20, 2007 Share Posted April 20, 2007 Dave, neglected to add that longer lenses focus past infinity to accomodate variation in operating temperatures. And zoom lenses tend to have looser tolerances than primes which are built to tighter tolerances. Link to comment Share on other sites More sharing options...
christiaan_phleger___honol Posted April 20, 2007 Share Posted April 20, 2007 Yup, what Bruce said, if the images *on film* are sharp and are consistent with your chosen focus point, don't mess with it. As a regular part of service, I have my bodies collomated at Inf. Link to comment Share on other sites More sharing options...
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