Archived posting to the Leica Users Group, 2008/04/20
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]My noct is coming back from Germany this week. Wish me luck. Leica claimed that adding the 6 bit coding ring would 'shim' it slightly and improve focusing with my m8. here's to sharp eyes and soft ears, Eric On Sun, Apr 20, 2008 at 10:31 AM, Leonard Taupier <len-1@comcast.net> wrote: > Hi Steve, > > Don didn't ask for my M8, just the lenses. He still has them and I would > expect for awhile as he's pretty busy. Others on the Camera forum have > done > the same thing and report very good results. > > Len > > > > > On Apr 20, 2008, at 10:15 AM, Steve Barbour wrote: > > > > > > On Apr 20, 2008, at 6:46 AM, Leonard Taupier wrote: > > > > > > > This is a very interesting issue. I don't know if anybody has mentioned > what happens to the depth of field of the Noctilux, or any other lens, in a > Leica film camera versus the M8 digital camera. It seems that nobody > complains about the focus on a film body but all kinds of complaints on the > M8, especially the Noctilux, Summilux Asph and the 75mm Summilux. Is there > a > difference? Yup, there sure is. I tested 16 leica lenses for depth of field > at a distance of 8 feet. I tested 13 of the lenses with film using a .85 MP > and compared the results to those taken with an M8 and a 1.25 Leica > magnifier. > > > > > > In every case the DOF shifts away from the camera with the M8. In other > words the lens appears to back focus. The worse lens for this shift is the > Noctilux. But even on a film camera it is barely in focus. The typical back > focus shift of any 50mm Leica lens is about 4 to 5 inches at 8 feet with > the > M8. The backward shift of the Noctilux is between 8 and 9 inches. This puts > the focused point of the rangefinder outside the depth of field of the > lens. > The other thing I noticed is the DOF is better centered on the older LTM > lenses then on the newer lenses. I don't know if this is a quality control > problem now or if the focus point test has changed. I tested 7 LTM lenses, > the Xenon, Summarit, Summitar, Summicron Coll, 50 Elmar RS, 90 Elmar and > 135 > Hektor. The focus point nicely stayed within the DOF on both cameras. Of > the > M lenses the best is the 1st 50mm Summicron rigid version followed by the > current 50mm Summicron. > > > > > > I verified my results with a second M8. The MP body is one year old and > purchased new. I also sent my Noctilux and 75mm Summilux to DAG for focus > adjustment even though the lens is still in warranty. I'm also shooting > more > with film these days. > > > > > > > hi Len, > > > > is it appropriate to send a Noctilux to DAG for focus adjustment, without > the body... > > > > does that work out OK? > > > > I agree that with film (bodies) I did fine with the Noctilux wide open, > with the M8 much less so... > > > > Steve > > > > > > > > > > > > > > > Len > > > > > > > > > > > > _______________________________________________ > > > Leica Users Group. > > > See http://leica-users.org/mailman/listinfo/lug for more information > > > > > > > best, Steve > > > > > > "I never wanted to be famous" > > http://www.blurb.com/bookstore/detail/186890 > > > > > > _______________________________________________ > > Leica Users Group. > > See http://leica-users.org/mailman/listinfo/lug for more information > > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >