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What was the intended benefit of this release-button-extender? - and does it have a product code/name? 

I couldn't find it on the Leica Wiki M accessory list. 

It seemingly doesn't improve ergonomics - like the Nikon AR-1 does on a Nikon F, where it lifts the release button above the film advance for easier access and provide a larger contact surface for your finger. 

The Leitz version actually reduces the finger contact area and doesn't provide a softer release feel like the Nikon AR-1 does.

This accessory does not fit a Barnack Leica (where it would have made more sense IMO).

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28 minutes ago, nitroplait said:

What was the intended benefit of this release-button-extender? - and does it have a product code/name? 

I couldn't find it on the Leica Wiki M accessory list. 

It seemingly doesn't improve ergonomics - like the Nikon AR-1 does on a Nikon F, where it lifts the release button above the film advance for easier access and provide a larger contact surface for your finger. 

The Leitz version actually reduces the finger contact area and doesn't provide a softer release feel like the Nikon AR-1 does.

This accessory does not fit a Barnack Leica (where it would have made more sense IMO).

 

Description:

LEITZ: Rare chrome 14088 OZTNO cable release adapter, c. 1955. Enables the use of screw-type cable releases on Leica M cameras.

 

https://auctions.leski.com.au/lot-details/index/catalog/615/lot/207353/LEITZ-Rare-chrome-14088-OZTNO-cable-release-adapter-c-1955-Enables-the-use-of-screw-type-cable-releases-on-Leica-M-cameras?url=%2Fauctions%2Fcatalog%2Fid%2F615%3Fpage%3D3

 

 

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8 minutes ago, frame-it said:

Enables the use of screw-type cable releases on Leica M cameras

Great, thanks!

OK. So you would buy this thing in order to use your Barnack cable-release on your M (instead of buying a new cable release). No wonder it is rare 😆

Thanks for the link. I guess it is Australian $280, but still!

I see it advertised for €200 in Europe!

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The Nikon AR-1 is commonly referred to as a soft release adapter, but many believe it was originally to bring the finger nearer to the shutter speed dial when using a Photomic head. I suspect the Leica adapter does something similar because height isn't necessary for a soft release, only area (which this doesn't have). So is there something like a Visoflex that it would work alongside?

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That's OZTNO, it allows the APDOO self timer to run on a M2.
If a user has a nice complicated close focus or scientific setup for Leica screw mount cameras with double cable release (think early reflex housings, bellows ....), the adapter allows to re-use this setup with a M Leica (of course a M-LTM adapter will be needed as well).
From my point of view, it has never been intended as a "soft release".

Best regards,
Peter.

Edited by scattered-light
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1 hour ago, sandro said:

No it would be too high for the releas arm of the Visoflex. In fact it would make use of the Visoflex as good as impossible. 

That‘s true for the Visoflex II or III. The Visoflex I didn‘t have the arms but only the double release. You could fix one release cable to the M camera with the OZTNO and the other on the Visoflex body, where you could fix it directly the same way as with a screwmount Leica. 

Edited by UliWer
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