Archived posting to the Leica Users Group, 1997/10/01
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]> >Dan--All this complaining about m-system RF going off is a little >silly I`ve had more problem SLRs going off than Leica RF > >my Nikons have had to go to shop my Pentax 67s (and other >photographer`s too that I have known) have had problems All for out >of alignment focusing screens Not uncommon at all > >One of my studio mates had a Hassy system that went out He borrowed >other studio mates hassy system and began replacing parts As long as >he had any part--body lens or back that was his then focus out of >alignent He finally sent it off to Hasselblad and they couldn`t >figure it out either and sent it back unfixed He finally in >frustration (and a reshoot of a CD album cover in mexico) sold it off in >pieces and bought all new > >So obviously Hassy Nikon or Pentax 67 are also not acceptable for >`professional` work according to our rec/dot/idiot poster > >We backup computers get our cars tuned up so why would cameras be any >different? > >Donal Philby >Kauai Hawaii Another problem apparently quite frequent with P 6 X 7's is that the mirror gets out of alignment (position when focusing) resulting in all pix being out of focus. This can happen with other SLRs too. Both screen and mirror need to be in perfect alignment!! With AF, there are undoubtably a host of additional problems that could throw off focus. With an M, one can easily validate the calibration by using the infinity check. With a standard set up (e.g., tripod, wall, and meter stick) one could also focus on a known fixed distance, say 1 M for a near range check. If both infinity and close range are OK, then the system checks out as two points define a line (relation of rangefinder position/focus with actual distance). In landscape mode the rangefinder image moves from left to right as you focus closer as has been pointed out, this is quite natural for most folks. Focusing vertical changes the relation so may be giving folks problems. I typically focus first horizonatally then decide on a portrait orientation - this works well for handheld MO. Working in vertical on a tripod is a different case - probably using the coincident aspect of the RF would work best (e.g. two noses focus into one) unless the picture has horiz. lines (e.g. tree branches, or horiz. parts of window frames) as these now work best with the split image aspect. Tom Thomas C. Kline, Jr., Ph.D. Research Scientist/ Diving Safety Officer Prince William Sound Science Center 300 Breakwater Avenue, P. O. Box 705 Cordova, AK 99574, USA 907-424-5800 tkline@grizzly.pwssc.gen.ak.us http://www.pwssc.gen.ak.us/