Archived posting to the Leica Users Group, 2008/04/20
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On Apr 20, 2008, at 7:58 AM, Eric Korenman wrote: > 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. sounds very scientific...let us know, Steve > > > 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 >> > > _______________________________________________ > 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