jaques Posted November 20, 2015 Share #1  Posted November 20, 2015 Advertisement (gone after registration) just saw this interesting adapter for offer on ebay. From what I can understand it converts the lens to a coupled non-goggled summicron 35mm? It seems to me that prior to this adapter such an operation was considered impossible? It looks as if the only thing it doesn't do is change the framelines- so you will have 50mm frames but no goggle correction... you can have the lens adjusted (file lug? collar?) further to bring up the 35mm lines but then the mod would be irreversible...  I have the goggled summicron and have always admired the compact non-goggled version. Having said that the goggled version has it's own merits...  Has anyone on the forum used this adapter- or if not- would you consider it? Link to post Share on other sites More sharing options...
Advertisement Posted November 20, 2015 Posted November 20, 2015 Hi jaques, Take a look here Convert Goggled Summicron to Goggle free with this adapter?. I'm sure you'll find what you were looking for!
NB23 Posted November 20, 2015 Share #2 Â Posted November 20, 2015 No... But what an awful translation. Headache. Link to post Share on other sites More sharing options...
gyoung Posted November 20, 2015 Share #3  Posted November 20, 2015 Not clear from the enigmatic instructions how it copes with the rf cam being ground differently to a non goggled lens, so rangefinder not accurate at mid distances if goggles removed  Gerry Link to post Share on other sites More sharing options...
jaques Posted November 20, 2015 Author Share #4 Â Posted November 20, 2015 Hmm, anyone with language skills prepared to contact the seller and discuss? Â The text seems to indicate that the lens will focus to infinity after the mod-and- as far as can be gleaned- seems to infer that further alteration by an expert in Guangzhou would be required for a complete and irreversible modification.... I assume/d this referred only to the frame lines- but perhaps the focus too? Link to post Share on other sites More sharing options...
earleygallery Posted November 20, 2015 Share #5 Â Posted November 20, 2015 As said, the lens cam (is said to) has a different profile to compensate for the goggles and I understand that even the focus scale is calibrated to show the focus distance as measured by the goggled rangefinder, i.e. you can't rely on scale focus unless stopped down enough for DOF to allow for any margin of error. Â But hey, buy it and try it out - you could prove all of this to be wrong! Link to post Share on other sites More sharing options...
adan Posted November 21, 2015 Share #6 Â Posted November 21, 2015 I wouldn't call this an "adapter," just a modification. (What does it adapt the lens to? Nothing it doesn't fit already (an M camera body)). Â The description/instructions are unclear (and it isn't just the translation - it isn't mentioned at all) - but I think it does two things. 1) Gets rid of the lumpy, unsightly rectangular flange to which the goggles mount, and 2) has the short camera mounting flange that brings up the 35mm frame instead of the 50mm frame (saves having to Dremel-tool the original). As mentioned, part 3 of the equation - changing the focus cam for the now-un-goggled RF geometry - remains as an exercise for the reader/buyer. Â James, I don't see where the focus scale would be different for goggled and ungoggled lenses. They are identical 8-element 35mm Summicron lenses: they are focused at infinity at x-many mm from the film plane, and at 1 meter at y-many mm from the image plane. Â The focus-cam modification in goggled lenses works backwards from what you suggest - it corrects the RF focusing to match the scale on the lens, (which is hard-wired to the physical distance of the lens from the film, and thus the same on goggled and un-goggled lenses). Link to post Share on other sites More sharing options...
jaapv Posted November 21, 2015 Share #7  Posted November 21, 2015 Advertisement (gone after registration) just saw this interesting adapter for offer on ebay. From what I can understand it converts the lens to a coupled non-goggled summicron 35mm? It seems to me that prior to this adapter such an operation was considered impossible? It looks as if the only thing it doesn't do is change the framelines- so you will have 50mm frames but no goggle correction... you can have the lens adjusted (file lug? collar?) further to bring up the 35mm lines but then the mod would be irreversible...  I have the goggled summicron and have always admired the compact non-goggled version. Having said that the goggled version has it's own merits...  Has anyone on the forum used this adapter- or if not- would you consider it? Whatever else I would never consider it. Ruining a perfectly good lens, destroying its value, can never make good the price differential to an un-goggled one. Selling it and buying the other seems the way to go. Link to post Share on other sites More sharing options...
jaques Posted November 21, 2015 Author Share #8 Â Posted November 21, 2015 could be a good option if your goggles were damaged? Also it doesn't ruin the lens as it is reversible. Link to post Share on other sites More sharing options...
jaapv Posted November 21, 2015 Share #9  Posted November 21, 2015 You still have to modify the focusing cam, otherwise you can only focus correctly at infinity. That is non-reversible.   2: if you want to completely converted into a M2 (M4) lens, need another modification curve to the end of the lens, otherwise the linkage of the lens range is not accurate, this need senior maintenance technician to complete, someone special to complete the work in guangzhou, but once the revised version can't revert to glasses lens. 2)The adapter able focus infinity. Link to post Share on other sites More sharing options...
sdk Posted November 21, 2015 Share #10 Â Posted November 21, 2015 Surely the helicoids that drive the focus cam are different in goggled versus non goggled Leica lenses. It's not just the part that couches the RF traveler in the camera that would have to be changed. Other parts would need to be replaced, and the lens essentially rebuilt. Link to post Share on other sites More sharing options...
james.liam Posted November 21, 2015 Share #11  Posted November 21, 2015 Listen to Jaap. Mess around with an old manual focus Nikkor non-AI, Canon, Pentax or Tamron, all plentiful and cheap if you screw up.  Don't mutilate a Leica.  Why someone would consider this Red Chinese Scheiße on eBay is incomprehensible. And who the hell is 'Yeenon'? "20 years experience" reverse-engineering other people's inventions? Link to post Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.