sps Posted January 20, 2007 Share #1 Â Posted January 20, 2007 Advertisement (gone after registration) First 60 pictures are backfocused by about 5 inches using the latest 75 Summilux. The 35 Summilux seems better focused initially. Â Shame- Everything focuses perfectly on the M7. Â I'll try the rest of my lenses as the day goes on. Link to post Share on other sites More sharing options...
Advertisement Posted January 20, 2007 Posted January 20, 2007 Hi sps, Take a look here Mine is back-focusing too. I'm sure you'll find what you were looking for!
jim_royer Posted January 20, 2007 Share #2 Â Posted January 20, 2007 And, what does backfocused mean? Jim Link to post Share on other sites More sharing options...
scjohn Posted January 20, 2007 Share #3 Â Posted January 20, 2007 sps How do you know "everything was focusing perfectly on the M7"? I noticed back focusing on the m8 with my 50mm but not with my 35 or 90. I assumed it was the 50 and not the camera. I had never noticed any issue with the 50 on my m7 but digital allows for immediate comparirisons. It is also easy to "zoom in" on digital images to study focus more closely. I assumed I just had not noticed the issue on the m7 so I already sent my 50 in for adjustment, repair (and coding while I was at it). Â Shouldn't it be the lens not the camera if other lenses do focus properly on the camera? Â (These are serious questions not rhetorical questions so common on this board) Link to post Share on other sites More sharing options...
sps Posted January 20, 2007 Author Share #4 Â Posted January 20, 2007 I was using the 70/1.4 last week on my M7, and printed proofs at 5x7, then had some blow-ups done. I was shooting at 1.4 & close to get d-o-f effects. I did the same thing today, and the face of the sleeping animal is blurry, and the fur on its body is tack sharp. I would notice this in a 5x7 print. Link to post Share on other sites More sharing options...
khanosu Posted January 20, 2007 Share #5  Posted January 20, 2007 And, what does backfocused mean? Jim   Hi Jim, hope this thread will be of help to you:  http://www.leica-camera-user.com/digital-forum/12697-m8-backfocus.html?highlight=backfocus  Furrukh Link to post Share on other sites More sharing options...
pemayeux Posted January 20, 2007 Share #6 Â Posted January 20, 2007 I received my M8 yesterday. I've been doing some test shots. I've got a 35 lux ASPH, 50 lux ASPF and a 75 lux. When I focus through the rangefinder the shots are out of focus. Looking at the depth of field scale, if I adjust the focus appx 1 fstop closer, the image is sharp. It is the same on all three lenses. Does this sound like a rangefinder adjustment? Link to post Share on other sites More sharing options...
pascal_meheut Posted January 20, 2007 Share #7 Â Posted January 20, 2007 Advertisement (gone after registration) Yes it does. Link to post Share on other sites More sharing options...
tjv Posted January 20, 2007 Share #8 Â Posted January 20, 2007 Strange thing, my 28 ASPH focuses perectly and my 50mm Summicron is slightly back focusing too. I was wondering if I was going crazy and perhaps needed glasses. Was thinking it was the lens, but am a little inclined to think that it's the rangefinder as a 28mm obviously has a larger DOF which may be counting to offset any focus issues in near to medium distances. Link to post Share on other sites More sharing options...
arthury Posted January 20, 2007 Share #9 Â Posted January 20, 2007 Did you do the newspaper test? Place a newspaper perfectly flat stuck on a wall. Mount your camera on a tripod and shoot the newspaper: with focusing variations. Check your images on the computer. Link to post Share on other sites More sharing options...
bradreiman Posted January 20, 2007 Share #10 Â Posted January 20, 2007 easy fix with a 2mil allen key. see the thread backfocus-solution Link to post Share on other sites More sharing options...
carstenw Posted January 21, 2007 Share #11 Â Posted January 21, 2007 The 2mm Allen key can fix infinity focus only. Link to post Share on other sites More sharing options...
jcbjr Posted January 21, 2007 Share #12 Â Posted January 21, 2007 The 2mm Allen key can fix infinity focus only. Â my own experience with two cameras is that the focus cam adjustment with the 2mm allen wrench works perfectly to adjust back focus issues. Â john Link to post Share on other sites More sharing options...
johnkuo Posted January 21, 2007 Share #13 Â Posted January 21, 2007 I would like to add that the 2mm allen key adjustment fixed the backfocus issue for my 35, 50 and 75. The only thing is the 28 which still front focuses. I think it's the lens itself. Link to post Share on other sites More sharing options...
pascal_meheut Posted January 21, 2007 Share #14 Â Posted January 21, 2007 Yes, by fixing the infinity focus with the 2mm allen key, you'll probably fix the backfocus all along the range. This is what happened to mine which is now spot on from 1m to 300000 km (i.e. the moon) Link to post Share on other sites More sharing options...
rvaubel Posted January 21, 2007 Share #15 Â Posted January 21, 2007 It's soooo much easier to check back focus on a digital camera than it is on a film camera. It's that instant gratification that does it. Just make sure that you focus on a newspaper at a 45 degree angle, not something flat on the wall. Use a tripod since a little body wooble can ruin the results. That is all you really need to do for near focus. Infinity focus is pretty obvious. Â Rex Link to post Share on other sites More sharing options...
sps Posted January 21, 2007 Author Share #16 Â Posted January 21, 2007 I hate to admit it, but I will.... The problem was me. I must have done something wrong in my shots. Â This morning I set up some critical testing as I refused to believe my new camera is off. All lenses (including the 75/1.4) were spot on. Â Interestingly, it was the first time I had mounted either the Noctilux (shot at f1.0) or the 135 Apo Telyt (shot at f3.4). Using the 1.25x magnifier, focus wasn't too difficult to achieve. Â Now if only I can figure out this whole digital processing thing.... Link to post Share on other sites More sharing options...
jrc Posted January 21, 2007 Share #17 Â Posted January 21, 2007 If your primary target is in focus, how do you separate minor back-focus issues from depth of field? For example, if you are focusing on X, and X is sharp, and five gradations behind X are fairly sharp, but only two gradations in front of X, how do you know whether you have a back-focus issue or are simply seeing a demonstration of DOF? Â JC Link to post Share on other sites More sharing options...
sps Posted January 21, 2007 Author Share #18 Â Posted January 21, 2007 I guess it depends on the f-stop of the lens. The Apo-Telyt at 3.4 has some DOF. However the Noctilux shot a minimum focusing distance all the way open is unforgiving. You can definitely tell. Link to post Share on other sites More sharing options...
Guest guy_mancuso Posted January 21, 2007 Share #19 Â Posted January 21, 2007 I need to run this test and see , mine seems to be fine . But here is a quick way to see if you are back focusing. Get the tripod out , yes a tripod and on the kitchen table get 4 boxes of cereal and just line them up and overlap them going across. Get the fastest lenses you have at 1.4 focus on the second box and shoot these wide open and see where you focus falls. Another quick test go to a corner of your house outside and at a 45 degree angle shoot down the wall maybe make a mark on the wall about 2 or 3 inches from the corner and focus on that and shoot wide open and see if that is the focus point , if it is not than you may see it after the mark which is backfocusing or in front of the mark front. But use a Tripod, sometime we move and not realize it Link to post Share on other sites More sharing options...
Guest Bernd Banken Posted January 21, 2007 Share #20  Posted January 21, 2007 with a little help from our friends;)  http://www.focustestchart.com/chart.html  Thanks Tim for your help.  Cheers Bernd Link to post Share on other sites More sharing options...
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