Page 1 of 2 12 LastLast
Results 1 to 10 of 13

Thread: Caltar II-N 210mm f5.6 aperture scale help

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1

    Join Date
    Mar 2014
    Location
    Vancouver, BC
    Posts
    9

    Caltar II-N 210mm f5.6 aperture scale help

    Iíve picked up a 210mm f5.6 Caltar II-N from ye old auction site. It was banged up enough to be cheap but is in functionally perfect condition... with one issue. The Copal No. 1 shutter itís mounted in has an aperture scale for an f6.8 lens.
    Iíd like to make a correct aperture scale. I know that I could do it myself with some time and effort, but I also know that this is an incredibly common lens for people to own as itís dirt cheap and pretty reasonably good. If someoneís able to take a couple close-up pictures of the scale with a flexible measuring tape, Iíd be very grateful. Given one side I should be able to figure out the other one.
    According to my research the correct aperture scale is (someone please correct me if Iím wrong) 0011.064. The mounting holes on my shutter are 65mm apart (for the larger of the two scales, that is).

    Also, if anyone has use for the scales that are on here (0013.055, I see this scale on a Caltar II-E 210mm f6.8) Iíd let them go for cheap.

    Click image for larger version. 

Name:	47B83BA7-3958-4CE0-89CF-7B4C9F18B474.jpg 
Views:	13 
Size:	55.4 KB 
ID:	200115Click image for larger version. 

Name:	07CB1D0C-26B3-4EB5-B80E-D718C471391D.jpg 
Views:	12 
Size:	54.5 KB 
ID:	200116

  2. #2

    Re: Caltar II-N 210mm f5.6 aperture scale help

    Just as a point of reference, I have had a set of 210mm f/5.6 Symmar-S cells in a Caltar II-E 210mm f6.8 shutter for ages shooting as is with zero exposure issues. I was shooting chromes with it for architectural jobs to boot. But to be clear, I never shot at wide open (as one can imagine) so the widest opening was just for focusing and I would close down to whatever (f/22/f/32 on the native aperture scale matching the meter) and fired away.

  3. #3

    Join Date
    Mar 2014
    Location
    Vancouver, BC
    Posts
    9

    Re: Caltar II-N 210mm f5.6 aperture scale help

    That’s a good point... I would still like to make an aperture scale, but I’ll go ahead and use it for now. I did notice that f/64 on the scale doesn’t line up with the narrowest aperture of the lens (the lens stops down a bit further past the f/64 mark). But I’m shooting colour neg so not a big deal to overexpose.

  4. #4

    Join Date
    Jan 2013
    Location
    Madisonville, LA
    Posts
    2,102

    Re: Caltar II-N 210mm f5.6 aperture scale help

    Quote Originally Posted by Theo View Post
    .... I did notice that f/64 on the scale doesn’t line up with the narrowest aperture of the lens (the lens stops down a bit further past the f/64 mark). But I’m shooting colour neg so not a big deal to overexpose.
    It's the same scale for the Caltar E and Caltar N as long as they're both for a 210mm lens. One is marked to 5.6 and one to 6.8! Nearly all shutter apertures close beyond the narrowest aperture of the lens because shutters are not made for specific lenses!
    Last edited by Luis-F-S; 5-Feb-2020 at 18:32.

  5. #5

    Join Date
    Jul 2012
    Posts
    46

    Re: Caltar II-N 210mm f5.6 aperture scale help

    I'm curious about this too. I have the same shutter with the same markings, with matching 210/6.8 lens cells. BUT, I sometimes stick my orphaned Symmar 150/5.6 cells in the shutter.

    I had been under the impression that I could derive the actual iris diameter from the focal length / f-number and use that to calculate the f-number for the other lens (in this case, f/11 on the 210 scale is 19.09 mm, which would be f/7.8 for the 150 scale) but it didn't quite work. I have to stop the lens down 1 2/3 stops further than my numbers say to. I wish I understood why. Maybe it's because the cells are different? It might work for you though.

  6. #6

    Join Date
    Sep 1998
    Location
    Buford, GA
    Posts
    13,051

    Re: Caltar II-N 210mm f5.6 aperture scale help

    Quote Originally Posted by devb View Post
    I'm curious about this too. I have the same shutter with the same markings, with matching 210/6.8 lens cells. BUT, I sometimes stick my orphaned Symmar 150/5.6 cells in the shutter.

    I had been under the impression that I could derive the actual iris diameter from the focal length / f-number and use that to calculate the f-number for the other lens (in this case, f/11 on the 210 scale is 19.09 mm, which would be f/7.8 for the 150 scale) but it didn't quite work. I have to stop the lens down 1 2/3 stops further than my numbers say to. I wish I understood why. Maybe it's because the cells are different? It might work for you though.
    Be much easier to just order scales from Rodenstock and not tell them that itís for a Schneider lens. Just tell them 150 Apo Sironar in Copal 0.

  7. #7

    Join Date
    Jul 2012
    Posts
    46

    Re: Caltar II-N 210mm f5.6 aperture scale help

    Quote Originally Posted by Bob Salomon View Post
    Be much easier to just order scales from Rodenstock and not tell them that it’s for a Schneider lens. Just tell them 150 Apo Sironar in Copal 0.
    It's actually a Linhof Symmar from 1960 or so. Would that still work?

  8. #8

    Join Date
    Sep 1998
    Location
    Buford, GA
    Posts
    13,051

    Re: Caltar II-N 210mm f5.6 aperture scale help

    Quote Originally Posted by devb View Post
    It's actually a Linhof Symmar from 1960 or so. Would that still work?
    As long as you tell them 150mm Sironar N and Copal 0 it should.

  9. #9

    Join Date
    Jul 2012
    Posts
    46

    Re: Caltar II-N 210mm f5.6 aperture scale help

    Quote Originally Posted by Bob Salomon View Post
    As long as you tell them 150mm Sironar N and Copal 0 it should.
    Good to know. Thank you!

  10. #10

    Join Date
    Jan 2013
    Location
    Madisonville, LA
    Posts
    2,102

    Re: Caltar II-N 210mm f5.6 aperture scale help

    Quote Originally Posted by devb View Post
    . Maybe it's because the cells are different? It might work for you though.
    No, it's because the focal length is different. One is a 210 FL, the other is a 150!

Similar Threads

  1. Caltar Rodenstock 135mm aperture scale
    By korby in forum Lenses & Lens Accessories
    Replies: 9
    Last Post: 6-May-2019, 20:00
  2. G-Claron 210mm f9 aperture scale
    By Fotoguy20d in forum Lenses & Lens Accessories
    Replies: 5
    Last Post: 23-Jun-2012, 17:10
  3. Need the aperture scale for a Calumet 210mm
    By Jason_1622 in forum Cameras & Camera Accessories
    Replies: 9
    Last Post: 25-Aug-2010, 12:26
  4. Aperture scale for 210mm symmar convertible
    By Darin Cozine in forum Lenses & Lens Accessories
    Replies: 1
    Last Post: 2-Feb-2005, 21:08

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •