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Nex/M42 focusing helicoids on ebay
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Posted: Tue May 03, 2011 7:49 am
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Posted: Tue May 03, 2011 7:49 am
Post subject: Nex/M42 focusing helicoids on ebay
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There are 3 sizes available and not exactly cheap.
Maybe i will get one, just have to figure out which size and have some spare $$$. Smile

14.7 - 21.7 MM Click here to see on Ebay
18.2 - 32.2 MM Click here to see on Ebay
21.8 - 42.8 MM Click here to see on Ebay


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Posted: Tue May 03, 2011 8:34 pm
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Posted: Tue May 03, 2011 8:34 pm
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Wait with purchase , our member Calvin83 will organize a helicoid group buy.

Read this ...
http://forum.mflenses.com/how-to-determine-the-length-of-a-needed-helicoid-t23791.html


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Posted: Tue May 03, 2011 9:18 pm
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Posted: Tue May 03, 2011 9:18 pm
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These are M42-NEX adapters with built-in focus helicoid.

But regular M42 helicoids can attach to M42-NEX adapter. Is price better?


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Posted: Tue May 03, 2011 11:03 pm
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Posted: Tue May 03, 2011 11:03 pm
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visualopsins wrote:
These are M42-NEX adapters with built-in focus helicoid.

But regular M42 helicoids can attach to M42-NEX adapter. Is price better?

Hard to find any new Chinese made one under 100 USD at least I don't know any.


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Posted: Wed May 04, 2011 6:28 am
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Posted: Wed May 04, 2011 6:28 am
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The problem with M42/Nex adapter + M42/M42 helicoid is that the adapter is very thick. If you need to mount a lens with shorter register it won't work. Anyway the prices of M42/Nex helicoids are similar for those M42/M42 helicoids.


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Posted: Wed May 04, 2011 1:03 pm
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Posted: Wed May 04, 2011 1:03 pm
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I could not find a very thin M42->NEX converter, so I made a hole in
the NEX body cap to fit M42->M42 helicoid. This is quite usable, but
the problem is its mechanical strength is not great. Someone in future
may make this thin adapter such as M42->F mount converter (1mm thick).

M42->M42 helicoid is more useful for me, and more versatile. I also found
Nikon F->micro 4/3 converter (non focus adapter). like this>
http://www.pbase.com/kkawakami/image/124972053
This one is not too thick, and nikon has many ext. tubes, and with the above
M42->F converter you can also use M42 helicoid together.

You can find an L-mount to M42 converter (1mm thick) too.


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Posted: Wed May 04, 2011 3:59 pm
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Posted: Wed May 04, 2011 3:59 pm
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M42 Asahi Helicoid ~15-23mm BIN GBP49

Click here to see on Ebay


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Posted: Wed May 04, 2011 5:05 pm
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Posted: Wed May 04, 2011 5:05 pm
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Is it m42-m42 ?


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Posted: Fri May 06, 2011 9:47 pm
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Posted: Fri May 06, 2011 9:47 pm
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yes, asahi unit is M42 female to M42 male.


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Posted: Mon May 09, 2011 6:10 pm
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Posted: Mon May 09, 2011 6:10 pm
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koji wrote:
I could not find a very thin M42->NEX converter, so I made a hole in
the NEX body cap to fit M42->M42 helicoid. This is quite usable, but
the problem is its mechanical strength is not great. Someone in future
may make this thin adapter such as M42->F mount converter (1mm thick).


I've got a thin M42 to NEX adapter of sorts:

Click here to see on Ebay.de

It's a C mount adapter with an extra M42 thread - I got it because it is the widest C mount adapter I could find, it fits my unmodified C mount Tevidons. I can put my M42 helicoids and an M39-M42 adapter and mount most of my weird and wonderful M39 lenses and get infinity focus. Exceptions I found so far are the Componon 28/4 (I may be able to mount it recessed far enough to get infinity) and the Computar dL 55/1.9.

The one major disadvantage of this adapter is its 25mm C mount acts as a baffle. This is less of a problem with most slow enlarging lenses, but a big one for the Nikkor-O 55/1.2. I could Dremel out the C mount, but then my Tevidons won't fit anymore..
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