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I just received a Summaron 2.8 cm f5.6 lens, which came mounted on an Irzoo adapter. Obviously, I wanted to remove it so I could screw it onto my IIIG! But I couldn't unscrew it... despite my repeated attempts with a W40 and filter wrenches. ...nothing budged. Frustrated, I decided to attach it to an M lens rear cap, and then, to my surprise, when I moved the lens slightly, it unscrewed itself without any effort.
This post will probably be of no use to the specialists on this forum, but perhaps it will be useful to people who have never had this experience... 

 

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1 hour ago, PG Black nickel said:

Frustrated, I decided to attach it to an M lens rear cap, and then, to my surprise, when I moved the lens slightly, it unscrewed itself without any effort.

This works - most of the time - though you might damage the plastic of the rear cap as the edges of the adapter cut into the cap's material.  It's easier and won't damage anything when you attach the lens to the camera's bayonet (of an M ...)  and turn the lens counter clockwise. 

In case an LTM-adapter is stuck on the camera's bayonet the rear side of an old rear cap of an M-lens will work wonders.

You find some illustrations for both ways here:

 

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It's because when you grab it you aren't applying pressure evenly around the circumference and you're slightly distorting the adapter causing it to stick, the same as a filter getting stuck on a lens, gentle forces don't distort the metal and it will usually unscrew using a mouse mat or other grippy surface to push it against.

Edited by 250swb
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Current M back caps are strong... but it was not so for the ones of decades ago... some years ago had a similar problem and tried to use an old back cap (the "flat" one, with classic Leitz logo): I damaged seriously its BM, and kept the adapter still firm on the SM Summaron which probably had it for 40 years or so, never removed... Still have that cap... it stays on the back of a BM lens, rotating freely 😁

Edited by luigi bertolotti
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I've been 3-D printing my own caps from downloaded files, so damaging one from a tight adapter would be no big deal. I noticed that LLL lenses come with nice metal rear caps - but looking closer they have molded plastic inside so could also be damaged.

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The 16596 bellows adapter provides the even loading and leverage needed.

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2 hours ago, alan mcfall said:

The 16596 bellows adapter provides the even loading and leverage needed.

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Good idea indeed, but... I like better to use more trivial devices... my 16596 I pretend it continues to "click" always perfectly 😎

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If you insert the stuck adapter that is on the screw mount lens into the 16596, red dot to red dot and then only turn the lens counter clockwise to unscrew the lens, you will not engage the 16596 button lock pin, as it is activated by turning the lens with bayonet adaper, clockwise. Plus it is then easier to remove the loose bayonet adapter from the 16596 as it is not "locked" in place.

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