edmond_terakopian Posted July 6, 2014 Share #1 Posted July 6, 2014 Advertisement (gone after registration) Greetings All, Bit of a strange one. I have an old Nikkor 8mm f8 Fisheye lens and I'm toying with the idea of mounting on my M 240 to see how well it'll work. I doubt very much it'll be technically good on the Leica M, but I think it might make some interesting results. However, I'm quite concerned the rear element on the fisheye protrudes far too much. I've measured from where the Novoflex adapter's mount ends (which is the bit that already goes inside the camera body, and the rear element still continues for 1.1cm. Does anyone have exact measurements of how deep a lens can be mounted? Please don't guess though as if your guess is off, no matter how well intentioned, then it's going to cause damage to my shutter curtains and probably sensor! Any thoughts would be most welcome! Cheers, Edmond Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/230060-mounting-an-8mm-nikkor-fisheye/?do=findComment&comment=2624971'>More sharing options...
Advertisement Posted July 6, 2014 Posted July 6, 2014 Hi edmond_terakopian, Take a look here Mounting an 8mm Nikkor Fisheye?!!. I'm sure you'll find what you were looking for!
edmond_terakopian Posted July 6, 2014 Author Share #2 Posted July 6, 2014 One more view. Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/230060-mounting-an-8mm-nikkor-fisheye/?do=findComment&comment=2624982'>More sharing options...
mmradman Posted July 6, 2014 Share #3 Posted July 6, 2014 It requires careful measurement. 1. Measure distance between flat end of M flange on the adapter to most distant part of the lens proutrouding when lens is focused at infinity (or any other distance it may protrude the most). 2. Measure distance between top of the M flange on the camera and shutter curtain, use tooth pick of drinking straw to probe into the camera chamber. 3. If distance 1 is shorter than distance 2 with say couple of millimetres difference it should be safe depth wise. As rear of the lens fits inside the throat of the lens adapter it should fit inside the "mirror" box on the M camera. If you have M film camera you can set shutter at infinity, fire, attach Nikkor/Novoflex contraption to check what is happening inside the chamber. Good luck. Link to post Share on other sites More sharing options...
01af Posted July 6, 2014 Share #4 Posted July 6, 2014 If this lens damages your shutter curtains then it will do just the same on any Nikon F camera. So don't worry, it will work just fine on that Novoflex adapter on a Leica M (Typ 240) ... and on a Leica M8 or M9, too, as this lens doesn't require careful focusing; scale focusing will do. [EDIT: Umm, wait, isn't this a fix-focus lens anyway?] The old Elmar 5 cm 1:3,5 lens (pre-war version), when collapsed, reaches almost 22 mm into the camera body (measured from the M bayonet adapter's flange) and doesn't touch the shutter curtains, much less the sensor. The distance from the M bayonet flange to the bars directly above and below the shutter blades is 22.5 mm (give or take one or two tenths of a millimeter). The distance to the actual blades is another 0.5 - 1 mm. So with your lens reaching into the body by a mere 11 mm, you're safe. Link to post Share on other sites More sharing options...
edmond_terakopian Posted July 6, 2014 Author Share #5 Posted July 6, 2014 If this lens damages your shutter curtains then it will do just the same on any Nikon F camera. So don't worry, it will work just fine on that Novoflex adapter on a Leica M (Typ 240) ... and on a Leica M8 or M9, too, as this lens doesn't require careful focusing; scale focusing will do. [EDIT: Umm, wait, isn't this a fix-focus lens anyway?] The old Elmar 5 cm 1:3,5 lens (pre-war version), when collapsed, reaches almost 22 mm into the camera body (measured from the M bayonet adapter's flange) and doesn't touch the shutter curtains, much less the sensor. The distance from the M bayonet flange to the bars directly above and below the shutter blades is 22.5 mm (give or take one or two tenths of a millimeter). The distance to the actual blades is another 0.5 - 1 mm. So with your lens reaching into the body by a mere 11 mm, you're safe. Thanks for the words of wisdom :-) Link to post Share on other sites More sharing options...
edmond_terakopian Posted July 6, 2014 Author Share #6 Posted July 6, 2014 Well, I did it!! Cheers All, Edmond Link to post Share on other sites More sharing options...
01af Posted July 6, 2014 Share #7 Posted July 6, 2014 Advertisement (gone after registration) It has been done before. Link to post Share on other sites More sharing options...
ayewing Posted July 6, 2014 Share #8 Posted July 6, 2014 Congratulations on a successful experiment. Despite the excellent advice I suspect there was a touch of anxiety at the moment of mounting the lens on the camera. Incidentally Ricoh produce a handy little gauge for checking compatibility of M lenses with the Ricoh GXR A12 M Mount. It would be good if Leica produced a similar gadget for the M240. Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/230060-mounting-an-8mm-nikkor-fisheye/?do=findComment&comment=2625225'>More sharing options...
darylgo Posted July 6, 2014 Share #9 Posted July 6, 2014 My 8mm Nikkor mounted fine on the M9 and it is a fun lens on the M bodies requiring no focus. I would be interested in your results as mine were slightly soft. It does make a nice portrait lens with it shallow depth of field and slight softness However I found it quite an interesting lens for time-lapse and subsequent conversion to video on a Nikon D200. Link to post Share on other sites More sharing options...
edmond_terakopian Posted July 7, 2014 Author Share #10 Posted July 7, 2014 Congratulations on a successful experiment. Despite the excellent advice I suspect there was a touch of anxiety at the moment of mounting the lens on the camera. Incidentally Ricoh produce a handy little gauge for checking compatibility of M lenses with the Ricoh GXR A12 M Mount. It would be good if Leica produced a similar gadget for the M240. [ATTACH]446025[/ATTACH] [ATTACH]446026[/ATTACH] Thanks :-) Indeed there was still a lot of anxiety!! The idea of the checking tool is super; perhaps you should suggest it to Leica?? Edmond Link to post Share on other sites More sharing options...
edmond_terakopian Posted July 7, 2014 Author Share #11 Posted July 7, 2014 My 8mm Nikkor mounted fine on the M9 and it is a fun lens on the M bodies requiring no focus. I would be interested in your results as mine were slightly soft. It does make a nice portrait lens with it shallow depth of field and slight softness However I found it quite an interesting lens for time-lapse and subsequent conversion to video on a Nikon D200. Indeed the perfect, shallow DOF portrait lens :-D It's a bit soft, but that's to be expected. The rear element is so close to the sensor, plus no profiles etc. Still good fun! Edmond Link to post Share on other sites More sharing options...
edmond_terakopian Posted July 7, 2014 Author Share #12 Posted July 7, 2014 Well folks, I've written a blog post on this and also have taken a nice picture today using the setup: Nikkor 8mm Fisheye On A Leica M Type 240 | Photo This & That Cheers, Edmond Link to post Share on other sites More sharing options...
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