I guess I am confused with the term 'flange back distance'. I check for infinity by taking five identical photos (wide open aperture) of a distant skyscraper outside my window. I focus a bit before in focus, almost in focus, in focus, slightly beyond focus, then more beyond focus, all carefully measured on the focus ring. I then rack up my enlarger and, with a magnifying glass, carefully scrutinize as to which negative is truly sharpest. If other than the one that is 'in focus', I adjust the tiny screws on the bottom and top of the helical (take top and bottom off camera) in order to make the 'REAL' infinity on the focus turn be the maximum. It is tedious to do but I want 'actual' to match 'apparent' focus.
Brian: Isn't is nice that APUG does not ban one for sacrilegious statements? Some forums do!!! (I won't mention names but take a look on the Lounge.) But, Brian, let's start a new religion (even though I am agnostic) called 'defame the GIII'. It is a great camera (when shooting at 2.8 or less) but the religion part is only to cause more people to open their collective eyes and see that truth sometimes trumps truisms. There is a culture out there (in diverse genres) that says: 'do not ever even think of knocking this' and such adherents will back up this threat with intimidation or worse. (Modern Art is probably the most striking example.) In the 70s it was fashionable to knock normal lenses and to ALWAYS prefer wides. With the digital age that mandate has had reason to become modified due to the small sensors. I love normal lenses, always have, and preferred the older focal length determinant of 55 or 58 as opposed to the more current 50, or even 45.
rbender: This is curious. Are you sure that that image is TRULY sharp or merely acceptable? And the contrast? Did you compare at both 1.7 and 5.6. adjusting shutter speed accordingly? I might dispute you if I saw your negatives. Then, again, this is curious: it is possible that you just might be correct and I might be wrong. Don't think so but have seen enough in this life to place doubt on anything, even me!!! - David Lyga
Last edited by David Lyga; 11-09-2013 at 09:51 AM. Click to view previous post history.