Archived posting to the Leica Users Group, 2010/01/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I have measured the clearance distance of every collapsible lens I own for the benefit of the LUG members. While I use every one of them in my M8's, I have never collapsed one. There is only one camera where I collapse a lens, a Leica II with a 50mm f3.5 nickel Elmar I carry in my pocket sometimes. Len On Jan 17, 2010, at 1:52 AM, Henning Wulff wrote: > At 1:32 AM -0500 1/17/10, Mark Rabiner wrote: >>> Rei, >>> >>> I think it may be a disclaimer in case something goes wrong when >>> inserting a lens with some sort of fault. As an example look at the >>> end of your Summitar. There are 3 fingers that have slots bent >>> up to >>> provide a snug fit to the barrel when the lens is extended. If >>> one of >>> these fingers get bent up too far it can hit the shutter in the >>> collapsed condition. Just an idea. Also I believe the old >>> collapsible >>> 90mm Elmar can hit the shutter. >>> >>> Len >>> >> >> >> I'm dying to know how all you guys have figured this all out!!! >> Leica says "don't put the retractable lens in your five thousand >> dollar >> camera or...." so you guys go >> "I bet that's baloney" and do it anyway and then write about it. >> What if it WASN'T ok? >> One five thousand dollar camrea off to Solms to have its insides >> replaced? >> I can't figure this out!?! >> >> Just doing it super slow makes it safe? To me it just seems >> impossible! >> >> [Rabs] >> Mark William Rabiner >> >> > > > You don't just take a lens, mount it and collapse it waiting for > the crunch. You measure things first. > > It's quite easy to measure, and once you check what the mounting > flange to shutter distance is, you know what to stay clear of. You > then measure, on a removed but collapsed lens what the distance is > between the lens' mounting flange and the back of the lens. You'll > find that with all 50's there is plenty of clearance. You can also > mount the Super Angulons, both f/4 and f/3.4 and even the Hologon f/ > 8, although the latter produces some rather remarkable vignetting. > > You can also look to see what intrudes into the chamber between the > mounting flange and the shutter from the top, bottom and sides and > relate it to the greatest diameter of the collapsing tube, namely > the three-prong locking claw. > > In any case, the only collapsible lens I have any doubts about is > the old 90/4 Elmar (not the current macro Elmar). I don't have one > to measure, but all other collapsible lenses, from old Nickel > Elmars through Hektors, Summars, Summitars and Summicrons and newer > Elmars clear everything easily. As mentioned before, best to mount > the lenses in their extended condition, as careless, skewed mount > could possible catch something (most probably the focussing arm). > -- > > * Henning J. Wulff > /|\ Wulff Photography & Design > /###\ mailto:henningw at archiphoto.com > |[ ]| http://www.archiphoto.com > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information