John McMaster Posted March 30, 2013 Share #1 Â Posted March 30, 2013 Advertisement (gone after registration) There are three holes, the one nearest the camera is threaded 1/4" whit (usual tripod thread), one at the front is unthreaded but what thread is the middle one? M6 is too large and M5 is too small so 3/16" whit? Â john Link to post Share on other sites More sharing options...
Advertisement Posted March 30, 2013 Posted March 30, 2013 Hi John McMaster, Take a look here Threads on 70-180 foot. I'm sure you'll find what you were looking for!
Michael Geschlecht Posted March 30, 2013 Share #2 Â Posted March 30, 2013 Hello john, Â Welcome to the Forum. Â Many large or/& heavy Leitz/Leica lenses have both 1/4-20 and 3/8-16 threaded holes to accept either size tripod head screw. Â A 3/8 inch diameter screw gives you slightly more than twice the cross sectional area of a 1/4 inch diameter screw making the 3/8 inch screw significantly stronger & more rigid. It is better to use the 3/8 inch coupling whenever you can. Â Best Regards, Â Michael Link to post Share on other sites More sharing options...
John McMaster Posted March 30, 2013 Author Share #3 Â Posted March 30, 2013 Thanks, the middle hole is smaller than the usual 1/4-20.... Â john Link to post Share on other sites More sharing options...
Michael Geschlecht Posted March 30, 2013 Share #4  Posted March 30, 2013 Hello john,  It could be that 1 or both of these holes are locating holes for shoulder stock locating pins. The shoulder stock itself could then be locked in place with the 1/4-20 screw.  You might try looking in the WIKI at the top of this Page under:  Reflex Lenses & Camera Accessories  Then:  Other R Accessories  Then:  Long Lens Stabilization Accessories  Best Regards,  Michael Link to post Share on other sites More sharing options...
John McMaster Posted March 30, 2013 Author Share #5 Â Posted March 30, 2013 Thanks again, I did not see any info there. I am looking at mounting an Arca style mounting plate to it, the Kirk LP-42 plate had a locating pin I believe, but not holding much hope in finding one though. I am unlikely to get a pin on a mount but could fit a second screw if I knew the thread.... Â john Link to post Share on other sites More sharing options...
algrove Posted March 30, 2013 Share #6 Â Posted March 30, 2013 john- I use RRS QR plates for all my long R lenses ( I never screw a tripod directly into the lens) and they work very well and do not cost too much. If I recall you can get them in either the 1/4 or larger 3/8. Some of their plates have come with both screws for whatever you want. Link to post Share on other sites More sharing options...
John McMaster Posted March 30, 2013 Author Share #7 Â Posted March 30, 2013 Advertisement (gone after registration) I have an RRS MPR-73 in my hands, it comes with 2x 1/4 screws. One of these will fit but the middle hole is threaded differently and I would like to find out if anybody knows what ;-) The hole is smaller and I asked if it was a 3/16" thread... Â john Link to post Share on other sites More sharing options...
Michael Geschlecht Posted March 31, 2013 Share #8 Â Posted March 31, 2013 Hello john, Â When you were looking at the place in the WIKI that I suggested did you follow up on the various shoulder stocks that are shown? Â When you research the various models you will most likely find the answers to your questions about what the threads etc are. Â Best Regards, Â Michael Link to post Share on other sites More sharing options...
John McMaster Posted March 31, 2013 Author Share #9 Â Posted March 31, 2013 Yes thanks, neither 14289 nor 14239 gave any technical information. I can put the second 1/4" screw in front of the foot for locking as I have done on my M Visoflex bellows and Nikon BP-6, but as there is a second screw thread I wondered if anybody knew what it was... Â john Link to post Share on other sites More sharing options...
robsteve Posted March 31, 2013 Share #10 Â Posted March 31, 2013 John: Â I don't think that extra hole was actually threaded. My 105-280mm had the same foot. The extra hole is either something specific to the manufacturing process or may just be there is the customer wants a 3/8" added later. Â For a foot, I used one of the shorter RRS plates with a little lip on the end to keep it from spinning. I put a bit of black tape on the lip to protect the foot on the lens. Link to post Share on other sites More sharing options...
Michael Geschlecht Posted March 31, 2013 Share #11 Â Posted March 31, 2013 Hello Everybody, Â Holes like those are sometimes put there for alignment lugs to fit in to assure proper positionng, or/& to take stresses, when/after screwing something down. Â Best Regards, Â Michael Link to post Share on other sites More sharing options...
John McMaster Posted March 31, 2013 Author Share #12  Posted March 31, 2013 I am asking RRS if something like the B82S plate with lip has the correct dimension (30mm from lip to bolt) to fit  thanks for your help  john Link to post Share on other sites More sharing options...
robsteve Posted April 4, 2013 Share #13  Posted April 4, 2013 I am asking RRS if something like the B82S plate with lip has the correct dimension (30mm from lip to bolt) to fit thanks for your help  john  John:  I think the B82S is what you want for it. It is the one I used. Their plates don't have the ISO spec pin for the second hole, but the lip on the end of the plate engages with the foot to keep it from spinning. Just put a piece of black tape over the end of the plate that has the lip to keep the plate from scratching your lens.  Here is my 105-280mm using the B82S plate. I also use that plate with my Nikon 70-200mm f2.8 VR II.  Link to post Share on other sites More sharing options...
Leicaiste Posted April 8, 2013 Share #14  Posted April 8, 2013 John: I don't think that extra hole was actually threaded. My 105-280mm had the same foot. The extra hole is either something specific to the manufacturing process or may just be there is the customer wants a 3/8" added later.  The R8 & R9 have the same extra hole. It the same as on many video camcorders.  They will all accept the following RRS plate :  Really Right Stuff - Item Listing  A bit short for the R8/R9 with a big lens or for lenses like the 105-280mm.    Lucien Link to post Share on other sites More sharing options...
erl Posted April 9, 2013 Share #15 Â Posted April 9, 2013 Robsteve, I am curious to know how you focus that combo, assuming it is an M9. I have the 70-180mm (for my R8) and no digital solution for using it. I would like to use it on my M9P with an adapter if possible. Not really ready to pony up $'s for the new M, yet. Link to post Share on other sites More sharing options...
robsteve Posted April 10, 2013 Share #16 Â Posted April 10, 2013 Robsteve, I am curious to know how you focus that combo, assuming it is an M9.I have the 70-180mm (for my R8) and no digital solution for using it. I would like to use it on my M9P with an adapter if possible. Not really ready to pony up $'s for the new M, yet. Â That photo was actually with a M7 mounted. I just took it to illustrate that with a small plate the M will still balance pretty easily. In other words, you don't need one of the long quick release plate. Â Years ago I did try some photos using the M8 and R lenses, using the R9 to focus, then swap to the M8. Link to post Share on other sites More sharing options...
tobey bilek Posted April 10, 2013 Share #17 Â Posted April 10, 2013 Robsteve, I am curious to know how you focus that combo, assuming it is an M9.I have the 70-180mm (for my R8) and no digital solution for using it. I would like to use it on my M9P with an adapter if possible. Not really ready to pony up $'s for the new M, yet. Â Consider the Leitax mount ring and a Nikon D800. Â So far I have five R lenses converted to Nikon. I think they will be my go to landscape option. Â I have no interest in an electronic finder or a zombie viewfinder Link to post Share on other sites More sharing options...
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