Archived posting to the Leica Users Group, 2000/03/24
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]OK, OK, now I'm in over my head. I have just enough knowledge to be dangerous. Why do you have to change the profile on the focusing cam when you put on the spectacles? Skip At 3/24/00 01:14 PM +0000, you wrote: >Skip, >I understand perfectly about that modification, short of modifying the >profile on the focusing cam on the lens (as the bespectacled 35mm /M3 lenses >were) there is no way to maintain correct rangefinder focusing with a pair >of goggles on the front of the lens. Ask Reinhold Mueller, the engineer who >did these mods (on 2 or more lenses) for Tom, he'll tell ya! > >Now Tom would say that there's little need for rangefinder focusing with a >21mm lens, and he'd be right, if that's what suits him. For myself, although >I was most interested in having this mod. done, I forwent it as I figured >I'd be one step forward and two steps back. > >Each to his own, > >best regards, >Jem > > ---------- > > From: Skip Williams[SMTP:skipwilliams@pobox.com] > > > > Jeremy, > > > > You may not understand my recommendations. Tom A had a 21/3.4 Super > > Angulon custom-fitted with the goggles from a 35/2 M3-era Summicron. He > > also had the 21 modified so that it brings up the 28mm frameline on an > > M6. So when you look through the finder, you see the 28mm framelines > > expanded to the 21mm's angle of view. The rangefinder focusing is not > > affected. Yes, it's a bit larger package, but not much more than the lens > > > > and a separate finder pair. > > > > Skip > > > > At 3/24/00 10:27 AM +0000, you wrote: > > >Skip, > > >But the drawback is the size of the lens package you're carrying around > > AND > > >the fact that you loose your rangefinder focusing except at infinity! > > > > > >I'd certainly prefer a dedicated w/a Leica, but the difficulty might be > > the > > >correct triggering of the frames with older lenses. As there was never a > > >defined setting for their frame triggering lugs I suspect that 21 and > > 24mm > > >lenses might trigger a variety of framelines. > > >If we work on the basis that there are only 3 positions available for > > >frameline triggering it follows that if we see the range as 21 - 35 to > > >include 24 and 28, then there are 4 focal lengths to look after, as on > > the M4 > > ------SNIP------- - ----------------------------------------------- Skip Williams Westfield, NJ skipwilliams@pobox.com http://www.skipwilliams.com - -----------------------------------------------