| View previous topic :: View next topic |
| Author |
Message |
enzodm
Joined: 11 Sep 2010
Posts: 350
Location: Italy
|
 Posted: Sat Nov 29, 2014 9:27 pm Post subject: Cheap focal reducer, no infinity - suggestions? - SOLVED |
 |
|
enzodm wrote:
Some month ago I bought a cheap focal reducer (EOS to Nex) from a seller positively cited here on the forum (c.kee).
I immediately discovered that it was not focusing at infinity, just very few meters. I arranged a return with the seller (kind), but... it was between work trips and vacations, and I forgot to send it back (my fault, not seller's).
So after some time I tried to adjust it but with no success. The focal reducer is one of those with screwed lens cell, so I tried to move it back and forth, but I did not find a satisfying position. I also tried to screw in /out the back element.
Any other suggestions? Maybe I could try to turn elements, one at a time... but if someone has an optical scheme maybe I could avoid mistakes. It is a pity because on short distances seems really not bad. Thanks.
_________________
Canon 60D, Tamron 17-50VC, Canon 55-250IS, Sigma 50-150/2.8 plus:
Wide: Mir 20/3.5, Kenlock 24/2.8, Tamron 28/2.5, Yashikor 35/2.8, Mir 37/2.8
Fifties: Voigtländer Color Ultron 50/1.8, Pentacon 50/1.8, Zenitar 50/1.9, Leica Summicron 50/2, CZJ Pancolar 50/2, CZJ Tessar 50/2.8, Industar 50/3.5 , Rikenon 55/1.4, Petri 55/1.8, Helios 58/2
In the middle: Cyclop 85/1.5, Nikon 100/2.8
135s: Tamron 135/2.5, CZJ Sonnar 135/3.5, Jupiter 135/3.5, CZJ Triotar 135/4, Tamron Twin Tele 135-225
Tele: Soligor 200/2.8, Pentax Super Takumar 200/4, Hanimex 400/6.3, Makinon 500/8
Various: Schneider-Kreuznach Componar 135/4.5, Tominon 105/4.5, Vest Pocket Kodak meniscus, Wray Supar 2"/4.5
Sony Nex 6 plus:
Industar 69 28/2.8, Fujian 35/1.7, Rokkor 50/1.4, Jupiter 50/2, Cosmicar 50/2.8, Industar-22 50/3.5, Leitz Elmar 90/4, Canon Serenar 100/4
Last edited by enzodm on Sun Nov 30, 2014 2:56 pm; edited 1 time in total |
|
| Back to top |
|
 |
enzodm
Joined: 11 Sep 2010
Posts: 350
Location: Italy
|
| Posted: Sun Nov 30, 2014 7:51 am Post subject: |
|
|
enzodm wrote:
Ok, just writing about it gave me the courage to attempt again an intervention and now is ok 
In the longest focusing distance position, the lens cell was hitting the body. However, I noticed that this was due to the last retaining ring, that cannot be screwed fully in. So I dismantled the lens cell, carefully aligned things, reassembled all, and now I can go slightly beyond infinity too. Glad owner of a cheap focal-turbo-meta-thing
_________________
Canon 60D, Tamron 17-50VC, Canon 55-250IS, Sigma 50-150/2.8 plus:
Wide: Mir 20/3.5, Kenlock 24/2.8, Tamron 28/2.5, Yashikor 35/2.8, Mir 37/2.8
Fifties: Voigtländer Color Ultron 50/1.8, Pentacon 50/1.8, Zenitar 50/1.9, Leica Summicron 50/2, CZJ Pancolar 50/2, CZJ Tessar 50/2.8, Industar 50/3.5 , Rikenon 55/1.4, Petri 55/1.8, Helios 58/2
In the middle: Cyclop 85/1.5, Nikon 100/2.8
135s: Tamron 135/2.5, CZJ Sonnar 135/3.5, Jupiter 135/3.5, CZJ Triotar 135/4, Tamron Twin Tele 135-225
Tele: Soligor 200/2.8, Pentax Super Takumar 200/4, Hanimex 400/6.3, Makinon 500/8
Various: Schneider-Kreuznach Componar 135/4.5, Tominon 105/4.5, Vest Pocket Kodak meniscus, Wray Supar 2"/4.5
Sony Nex 6 plus:
Industar 69 28/2.8, Fujian 35/1.7, Rokkor 50/1.4, Jupiter 50/2, Cosmicar 50/2.8, Industar-22 50/3.5, Leitz Elmar 90/4, Canon Serenar 100/4
|
|
| Back to top |
|
|
philslizzy
Joined: 07 Aug 2012
Posts: 4744
Location: Cheshire, England
|
| Posted: Sun Nov 30, 2014 10:25 am Post subject: |
|
|
philslizzy wrote:
I'm glad you sorted it out. I'm happy with my Zhongyi version. I suspect there may have been an error in assembly. A pity you weren't able to send it back.
_________________
Hero in the 'messin-with-cameras-for-the-hell-of-it department'. Official. |
|
| Back to top |
|
|
enzodm
Joined: 11 Sep 2010
Posts: 350
Location: Italy
|
| Posted: Sun Nov 30, 2014 3:01 pm Post subject: |
|
|
enzodm wrote:
Phil, yes, an error in assembly. One distance ring was slightly off, and due to the relatively strict tolerance, gave resistance when screwing in the last ring. It is ok now, and in the next days I will try it with some meaningful picture. At the end the focal reducer is slightly shorter than the EOS-Nex adapter, and this makes it even more convenient, apart from aperture gain.
_________________
Canon 60D, Tamron 17-50VC, Canon 55-250IS, Sigma 50-150/2.8 plus:
Wide: Mir 20/3.5, Kenlock 24/2.8, Tamron 28/2.5, Yashikor 35/2.8, Mir 37/2.8
Fifties: Voigtländer Color Ultron 50/1.8, Pentacon 50/1.8, Zenitar 50/1.9, Leica Summicron 50/2, CZJ Pancolar 50/2, CZJ Tessar 50/2.8, Industar 50/3.5 , Rikenon 55/1.4, Petri 55/1.8, Helios 58/2
In the middle: Cyclop 85/1.5, Nikon 100/2.8
135s: Tamron 135/2.5, CZJ Sonnar 135/3.5, Jupiter 135/3.5, CZJ Triotar 135/4, Tamron Twin Tele 135-225
Tele: Soligor 200/2.8, Pentax Super Takumar 200/4, Hanimex 400/6.3, Makinon 500/8
Various: Schneider-Kreuznach Componar 135/4.5, Tominon 105/4.5, Vest Pocket Kodak meniscus, Wray Supar 2"/4.5
Sony Nex 6 plus:
Industar 69 28/2.8, Fujian 35/1.7, Rokkor 50/1.4, Jupiter 50/2, Cosmicar 50/2.8, Industar-22 50/3.5, Leitz Elmar 90/4, Canon Serenar 100/4
|
|
| Back to top |
|
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
Search
Memberlist
Register
Profile
Log in to check your private messages
Log in
