Archived posting to the Leica Users Group, 2007/01/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Henning, Thanks for that info. It's such a simple design it has to be something simple like the spacer. In any case I got $100 discount plus a free Leica repair. I shot a 36 exp roll with the lens and every shot under 500 meters was stunning. Len On Jan 13, 2007, at 10:32 PM, Henning Wulff wrote: > At 9:49 PM -0500 1/12/07, Leonard Taupier wrote: >> I tried a 400mm f6.8 Telyt lens today. The lens was mint as was >> the R8 I tried it on. The problem I had was it would not focus all >> the way to infinity. This was visible in the viewfinder as well as >> on film. I would say the focus was fine up to about 500 meters. >> Has anyone run into this problem? it appears that if the sliding >> focus was allows to come towards the body another 1/8th inch or so >> it would be fine. As neither the lens nor the body were mine I >> didn't attempt any adjustment to the infinity stop. >> >> This lens is very nice otherwise and includes the shoulder brace >> and original instructions in the original box for less then US >> $600. The photos of closer focused objects look pretty sharp. >> >> Len > > This is a guess, but.... > > The front lens assembly is held in a unit that unscrews from the > rest of the front barrel. The final location of the front lens > unit, which will determine whether it can focus only on nearer > objects, to infinity, or past infinity, is determined by a spacer > ring that this front lens assembly screws against. This ring is > machined at the factory to match the individual lens, as the lenses > are not all of exactly the same focal length. > > So it could be that the spacer ring is not seated correctly, > because if it is slightly askew, it could seem that the front > element is seated firmly while not being in the right position, ie, > not screwed far enough in. Or some foreign object could be in the > way, preventing correct seating. Or, and this is a lot less likely, > a spacer ring from another lens was mistakenly inserted. > > In any case, the first thing to do is to unscrew the front element > assembly, shake out the spacer ring and reinsert it after making > sure no foreigh object is in the way, letting it fall in smoothly. > Then screw in the lens assembly again and check focus. Most likely > the lens will now focus to infinity. > > If it still doesn't, the spacer ring can be ground down until the > lens does focus to infinity. > > BTW, $600 is somewhat on the high side. > > -- > * Henning J. Wulff > /|\ Wulff Photography & Design > /###\ mailto:henningw@archiphoto.com > |[ ]| http://www.archiphoto.com > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information