Archived posting to the Leica Users Group, 1998/04/15
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hi Luggers After reading all the posts on this subject I decided to try an experiment and it worked rather well so I thought I would share it with the Lug. I took the back doors off my various Leica M's and mounted them on a tripod, took the plain ground glass from one of my Nikon F2's and placed it resting on the film rails of each of the M's. I focused each of my lenses on a target fairly close by and then observed the ground glass with a loupe. There is indeed some variation among the lenses when observing through the viewfinder (they don't all find infinity at the same point), and there is some variation depending on combination of body/lens. on the groundglass the focus of some lenses (in particular my 50mm Summicron Canada) is not quite on the spot when compared to the viewfinder, but I think the difference is actually negligible (say focus at closest focus is out by maybe 1- 1.5 cm. I guess on a F2.0 lens that would be considered within acceptable tolerances (I'm not sure)?! On the Noctilux focus seemed to be spot on on all bodies. So did focus on the 35mm Asph. Summilux. This is strange as the 90mm Summicron seemed happy on two bodies and fractionally out on the third. Strange! Rock photographer Jim Marshall who shoots with M4's (he apparently has 5 or 6 of them) apparently has his lenses individually adjusted to individual bodies and then never takes them off!! He reckons it's the best way to get supreme accuracy!!! Hope this is of some interest Harold - ---------------------------------------------------------------------- Visit my web site at: http://hgphoto.home.ml.org You can send a short text message to my cellphone by sending e-mail to 0837004303@sms.co.za. Please ensure that mail sent for this purpose is in plain text only. My e-mail addresses are as follows: haroldgess@journalist.com gess@icon.co.za Please use either of these to reach me and, lest you lose sight of it, have a nice day!