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eawtan
Joined: 05 Apr 2013
Posts: 9
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 Posted: Fri Apr 05, 2013 4:05 am Post subject: DIY Project : Adapting an old folder lens(CZJ Tessar) |
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eawtan wrote:
I have a 645 welta folder which has been lying around for the past 15 years. I got it cheaply and was not satisfied with the front focusing (suspect it is off). I've been trying to try to adapt it for other camera (nikon 35mm mount) but was not successful the first few times.
Goals
- achieve infinity focus
- bypass the front focus (since it is suspected to by faulty).
- no messing around with super/crazy glue, cement etc , has to be a "clean" solution.
That leaves out bellows -- with the rear focus of a 75mm , not much room left .
The lens ....
The rear mount is a 30mm thread (not a standard copal size though).
Mananged to find a 30->52mm filter step ring that fits (after some filing) ....
Added a 52mm->42mm ring ...
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eawtan
Joined: 05 Apr 2013
Posts: 9
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| Posted: Fri Apr 05, 2013 4:06 am Post subject: |
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eawtan wrote:
With M42 helcoid and M42->nikon adater....
On the camera
While the example is on a 35mm camera, one can mount any LF lens in a similiar way to the M42 helcoid , and mount the setup on a lomo, diy camera etc ... |
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eawtan
Joined: 05 Apr 2013
Posts: 9
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| Posted: Fri Apr 05, 2013 4:14 am Post subject: |
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eawtan wrote:
Near Infinity test 1 (f4.5) ... brick wall . ZERO processing, straight out of DSLR .
100% Crop .
Near Inifinity test 2 (f4.5) ... details . again zero processing.
100% Crop
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eawtan
Joined: 05 Apr 2013
Posts: 9
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| Posted: Fri Apr 05, 2013 4:14 am Post subject: |
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eawtan wrote:
Max closeup -- front focusing extended max, and helicoil extended max ...
Front focus at Infinity, helicoil at max extension.
I will use the front focus as a "softness" selection, infinity == 0 softness/glow, and decreasing focus will increase the softness/glow .... |
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eawtan
Joined: 05 Apr 2013
Posts: 9
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| Posted: Fri Apr 05, 2013 4:16 am Post subject: |
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eawtan wrote:
With bellows, this setup becomes a macro lens ....
eg...
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nurkov
Joined: 21 Feb 2013
Posts: 711
Location: United Kingdom
Expire: 2014-03-09
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| Posted: Fri Apr 05, 2013 6:22 am Post subject: |
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nurkov wrote:
good results I have to say.
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Nesster
Joined: 24 Apr 2008
Posts: 5883
Location: NJ, USA
Expire: 2014-02-20
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| Posted: Fri Apr 05, 2013 10:24 am Post subject: |
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Nesster wrote:
Creative, and a neat job. It looks good on the FE2. And the results are excellent
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Camera photos
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eawtan
Joined: 05 Apr 2013
Posts: 9
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| Posted: Fri Apr 05, 2013 10:40 am Post subject: |
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eawtan wrote:
Straight out of cam the images are low contrast (expected of a ~1936 non-coated lens).
Stopped down to f8, and with some curve correction in PS, the lens gives excellent results (as seen in the closeup, with bellows). |
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GeorgeSalt
Joined: 09 Feb 2013
Posts: 336
Location: Norfolk, UK
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| Posted: Fri Apr 05, 2013 11:26 am Post subject: |
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GeorgeSalt wrote:
Excellent results, the macro shots where you've processed the image are fantastic.
I know a junk shop with a selection of beat-up folders in the back, I may need to have a try at this! |
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TAo2
Joined: 09 Mar 2012
Posts: 319
Location: Scotland
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| Posted: Fri Apr 05, 2013 11:30 am Post subject: |
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TAo2 wrote:
As a technical exercise...ah get it
As a desire to re-use an old lens...ah get it
As a macro with bellows, results look fine.
But it's failed tae reach the goals you set? 
It looks cool on the end of the Nikon but that's not the purpose, is it? If it doesn't perform as a lens? |
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Fri Apr 05, 2013 12:16 pm Post subject: |
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Attila wrote:
| Nesster wrote: |
| Creative, and a neat job. It looks good on the FE2. And the results are excellent |
+1
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Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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tond
Joined: 12 Jul 2011
Posts: 63
Location: Dublin, Ireland
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| Posted: Fri Apr 05, 2013 12:16 pm Post subject: |
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tond wrote:
TAo2, no need to overcomplicate things 
Well done, eatwan! I like it. |
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luisalegria
Joined: 07 Mar 2008
Posts: 6602
Location: San Francisco, USA
Expire: 2018-01-18
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| Posted: Fri Apr 05, 2013 6:10 pm Post subject: |
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luisalegria wrote:
If you want to get it working on the folder -
Its really quite easy to reset infinity on these German front cell focus cameras.
The secret is to make a plastic groundglass that fits in the film gate - i.e., piece of clear plastic cut to fit, the side towards the lens sanded with fine sandpaper.
Tape it in the film gate.
Focus the front cell until you get infinity on the groundglass.
Loosen the setscrews on the front cell bezel and turn it so the infinity indicator is in the right place. Re-tighten the setscrews.
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I like Pentax DSLR's, Exaktas, M42 bodies of all kinds, strange and cheap Japanese lenses, and am dabbling in medium format/Speed Graphic work. |
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eawtan
Joined: 05 Apr 2013
Posts: 9
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| Posted: Sun Apr 07, 2013 9:01 am Post subject: |
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eawtan wrote:
| TAo2 wrote: |
As a technical exercise...ah get it
But it's failed tae reach the goals you set?
It looks cool on the end of the Nikon but that's not the purpose, is it? If it doesn't perform as a lens? |
Goals review:
- achieve infinity focus --> Yes, focuses to infinity on a nikon mount .
- bypass the front focus (since it is suspected to by faulty). --> Yes with the helicoid on nikon mount
- no messing around with super/crazy glue, cement etc , has to be a "clean" solution. --> Yes, no super/crazy glue (or cement) used and I can always remount it back to the folder .
The setup is also used for mounting my el-nikkors (39mm screw mount) onto nikon mount while still maintaining the above 3 goals (just remove the czj, 30->52, 52->42 and replace with el-nikkor, 39->42 ).
Another use is to try out UV photography using non-coated lens (as well as el-nikkor) .... |
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eawtan
Joined: 05 Apr 2013
Posts: 9
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| Posted: Mon Apr 15, 2013 11:27 am Post subject: |
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eawtan wrote:
Wide open
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