Ario Arioldi Posted March 14, 2007 Share #1 Â Posted March 14, 2007 Advertisement (gone after registration) I've discovered that my M8 rangefinder needs to be calibrated. For very far subjects, with the lens on infinity, I cannot see the images out of the rangefinder to overlap as they should be. I understand that some of the usual contributors to this forum has already done such calibration I would like to know if in my particular case the rotation to be applied to the eccentric is clockwise or counterclockwise. Thanks, Ario Link to post Share on other sites More sharing options...
Advertisement Posted March 14, 2007 Posted March 14, 2007 Hi Ario Arioldi, Take a look here Rangefinder Calibration. I'm sure you'll find what you were looking for!
blakley Posted March 14, 2007 Share #2 Â Posted March 14, 2007 I presume you're talking about horizontal mis-alignment - you can adjust vertical also, but you have to take the red dot off to get to the eccentric, and I think you need a special screwdriver (torx?) Link to post Share on other sites More sharing options...
Ario Arioldi Posted March 14, 2007 Author Share #3 Â Posted March 14, 2007 I presume you're talking about horizontal mis-alignment - you can adjust vertical also, but you have to take the red dot off to get to the eccentric, and I think you need a special screwdriver (torx?) I do not think I have any problem with the vertical misalignment (hopefully) Ario Link to post Share on other sites More sharing options...
jaapv Posted March 14, 2007 Share #4 Â Posted March 14, 2007 1. Remove lens 2. Little wheel is sitting in front of you at the top of the "mouth"of the camera 3. Insert 2 mm Allen wrench in the centre of the little wheel 4. Move the wrench a few degrees at a time, remounting the lens each time to check if you are moving in the right direction and amount 5. Use something really far away, at least several kilometres to check adjustment. The moon is very good. Link to post Share on other sites More sharing options...
blakley Posted March 14, 2007 Share #5 Â Posted March 14, 2007 A bright star is even better than the moon, because it's a point source and it shows both horizontal and vertical misalignment very clearly. Link to post Share on other sites More sharing options...
carstenw Posted March 14, 2007 Share #6  Posted March 14, 2007 The vertical misalignment requires a special Leica tool to fix, which costs about €300. It also requires removing the Leica red dot. This not really recommended to anyone but the most hard-core. The near-far balance is done with the screw and tab at the end of the arm which holds the wheel. This is also not recommended to fiddle with for anyone etc. The wheel adjustment is very easy for anyone with patience, care, and a 2mm allen key. I have done mine a couple of times, and it is simple. You just need some patience turning it back and forth until it is right. Link to post Share on other sites More sharing options...
blakley Posted March 14, 2007 Share #7 Â Posted March 14, 2007 Advertisement (gone after registration) The red dot, by the way, is very fragile & easily damaged. It's apparently held on with a piece of double-sided tape whose adhesive, I'm told, is exceptionally aggressive - so it's very difficult to get the dot off without damaging it. I suspect that when Leica repairs them they just throw the old dot away & put a new one on. Link to post Share on other sites More sharing options...
carstenw Posted March 14, 2007 Share #8 Â Posted March 14, 2007 My macro photos in the Visoflex III thread would seem to contradict that! The dot clearly is missing some paint in two places. Â I have read that it is relatively easy to get it off, if you are patient. Take a flat toothpick, or a small screwdriver with a piece of thin cloh around it, and push the dot alternatingly clockwise and counter-clockwise, by placing the flat end of the toothpick on the Leica lettering and pushing. Some Magnum photographer who wanted to paint his red dot black came up with that one. Anyway, it doesn't help much if you don't have the tool... Link to post Share on other sites More sharing options...
Ario Arioldi Posted March 15, 2007 Author Share #9 Â Posted March 15, 2007 I've discovered that my M8 rangefinder needs to be calibrated.For very far subjects, with the lens on infinity, I cannot see the images out of the rangefinder to overlap as they should be. I understand that some of the usual contributors to this forum has already done such calibration I would like to know if in my particular case the rotation to be applied to the eccentric is clockwise or counterclockwise. Thanks, Ario I do not mean to incourage anybody to to the same by I need to inform you that I easily managed to calibrate the infinity point by rotating the Allen wrench by few degrees counterclockwise. Obviously I had to do the operation twice because at first I choose the wrong direction ( as per Murphy's law). Ario Link to post Share on other sites More sharing options...
carstenw Posted March 15, 2007 Share #10 Â Posted March 15, 2007 You should check that your near focus is still spot on. Mine is either-or. I have chosen to focus at 2m perfectly, and to simply turn the lens to infinity for long shots. In between I have to guess. It works okay, but once the waiting times lower a bit, I will send it in again. Link to post Share on other sites More sharing options...
Ario Arioldi Posted March 15, 2007 Author Share #11 Â Posted March 15, 2007 You should check that your near focus is still spot on. Mine is either-or. I have chosen to focus at 2m perfectly, and to simply turn the lens to infinity for long shots. In between I have to guess. It works okay, but once the waiting times lower a bit, I will send it in again. I did already check the near focus and is spot on, equal or better then before the calibration. Ario Link to post Share on other sites More sharing options...
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