Archived posting to the Leica Users Group, 2008/04/20
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]When I use the focus chart I find the results are different from real like photos. If I build a test bed which is along the horizontal plane and the camera is at the same height as the test, I can move further away from the target to a more realistic distance. For a rangefinder camera it is more realistic to be 5, 6, 7 feet from the focus point. I got more accurate results. The test chart was developed for a SLR with a contrast detecting auto focus system. If it detects the contrast and sets the lens improperly it will have an error no matter what the distance. Not so with the rangefinder. I hope I was able to be a little clearer. I had to do an awful lot of testing to come up with this opinion. Len On Apr 20, 2008, at 1:57 PM, Adam Bridge wrote: > On Sun, Apr 20, 2008 at 10:02 AM, Leonard Taupier > <len-1@comcast.net> wrote: > >> Adam, >> >> Good memory. >> >> The chart is here. Print out the pdf. Print page 9 with photo >> grade paper. >> That's the chart. >> >> < http://focustestchart.com/focus20.pdf> >> >> I originally used this chart but found if everything is on the >> same plane >> the results are more accurate. >> > > Len, I don't think I understand what you mean here. Could you > elaborate? > > Adam > >> >> Len >> >> > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information