I presumed this fact to be intuitively obvious to the most casual observer. Nevertheless, if the scale on the lens is correct, misalignment of the mirror will not affect film focus using the scale and a tape measurement.
Regards, Bob... From: "Fred" <[EMAIL PROTECTED]> > > 4. Poorly positioned mirror (the usual problem) will have no > > effect on film focus, but will affect focus screen focus. > > Actually, Bob, mirror misalignment ~will~ affect film focus, albeit > indirectly. (However, directly or indirectly, the effect is going > to be that the image cast onto the film will not be sharp.) Since > the user will be focusing the lens so as to make the focus screen > image as sharp as possible, if the mirror is out of alignment, > he/she will always be setting the lens so as to cause the image > landing on the film plane to be out of focus. (A pentaprism SLR > always makes the assumption that the mirror focus is aligned with > the film plane focus - if they don't match, then out-of-focus images > will be captured at the film plane.) Therefore, a poorly positioned > mirror ~will~ have an effect on film focus. - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
