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Meyer-Optik Trioplan 75mm 3.5 V
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PostPosted: Wed Mar 25, 2015 11:07 am    Post subject: Reply with quote

I disassembled only one camera - Beier Precisa IIa. This gave me the second one. The first one was given to me by my co-worker as is - just the lens.

Anyway, this camera was sitting on a shelf for decades without being used. Now the lens will be used for sure as I really like it. I really think this is a better outcome for any thing - to be used rather then to rest on a shelf.


PostPosted: Wed Mar 25, 2015 2:29 pm    Post subject: Reply with quote

Snowcat wrote:

Anyway, this camera was sitting on a shelf for decades without being used. Now the lens will be used for sure as I really like it. I really think this is a better outcome for any thing - to be used rather then to rest on a shelf.


I agree, as long as the donor camera isn't a rare collector piece. Mine is removed from a Welta which didn't strike me as anything special. Mine also appears much like your second one as you can see by the photo I provided in this thread. Your results look very promising. Congratulations.

Could you give me the specifics of what you used to achieve the second adaptation? I'm now quite eager to start using it. And the front focusing bonus is great.


PostPosted: Wed Mar 25, 2015 3:27 pm    Post subject: Reply with quote

Of course I will share the setup.

From bayonet to filter: Sony A to M42 adapter, 7mm M42 macro ring, 17mm-31mm M42 to M42 focusing helicoid, M39 to M42 ring, hand made aluminium adapter from native small screw to M39, then the lens itself and the hood made from two filters.

The fishy part is that homemade thing converting native m32 (maybe m32.5) to m39. I have only one such thing and I got it accidentially, among other random parts of lenses from my co worker...

But I managed to assemble two of such lenses. The second is made from old and dirt_cheap lens Industar 50. You can get a copy of Industar 50 in bad condition alsmost for free here in Russia. I took the outer part of it's helicoid, a piece of a wire of proper diameter and inserted the mount of trioplan in that helicoid, filling the space between them with that wire. Not as elegant as the first variant but it works and it's very strong. You just need a correct piece of a wire. I used a standard computer wire and had to forcefully insert it with a screwdriver in between of the lens and Industar's helicoid. The other side of the helicoid is standard m39 or m42.

Here is helicoid - http://www.ebay.com/itm/121230262149?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Here is I50 - http://www.ebay.com/itm/Industar-50-Russian-rangefinder-3-5-50mm-M39-Lens-RED-P-/181699692155?pt=LH_DefaultDomain_0&hash=item2a4e25467b

Hope that helped! Feel free to ask anything else if needed.


PostPosted: Wed Mar 25, 2015 5:49 pm    Post subject: Reply with quote

Thanks. After I start looking into it, I may contact you again.


PostPosted: Mon Apr 27, 2015 8:23 am    Post subject: Reply with quote

At last I have blooming flowers everywhere around me when I go for any walk. And I am taking my half hand made trioplan with me. And I must say I am quite happy with this cosmic looking lens.









Still have no "circles"-in-bokeh like photos but working in it Smile