Page 1 of 3 123 LastLast
Results 1 to 10 of 26

Thread: Sironar N 120mm

  1. #1

    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    954

    Sironar N 120mm

    Does anyone know this lens?
    I have seen 135mm, 150mm. But when I saw the 120mm, it surprised me, the lens is in Copal 1 shutter. Does anyone know why it's the case?

  2. #2

    Join Date
    Sep 1998
    Location
    Buford, GA
    Posts
    13,469

    Re: Sironar N 120mm

    It was available only for a couple of years around 1986 or so. Barely covered 45 and never sold well.

  3. #3

    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    954

    Re: Sironar N 120mm

    Bob, do you know why would they use a copal 1 shutter instead of copal 0?

  4. #4

    Join Date
    Sep 1998
    Location
    Buford, GA
    Posts
    13,469

    Re: Sironar N 120mm

    Quote Originally Posted by Songyun View Post
    Bob, do you know why would they use a copal 1 shutter instead of copal 0?
    Sorry, we have nothing that would stste why. But it would have to be for the same reason why a 90mm 4.5 Grandagon is also in a 1 shutter. Physical size of the threads on the lens groups. Otherwise they would have saved money and gone with a 0.

    The only tech info I have is a flyer from 3/88 that shows the 120 Sironar-N being only in Copal, Compur and Prontor Professional 1 shutters and its having an image circle of 175mm. It was quite a bit larger then the 100 and 135mm Sironar lenses. They had a 40.5mm front filter thread while the 120 had a 52mm filter thread.. In fact it was also larger in diameter then the 150mm and only the 180mm and longer had a larger filter size. Also it had a 51mm diameter rear mount. That was the same size as the 180mm Sironar-N as well. The 150mm had a 42mm rear mount diameter. Lastly, the 120mm lens was 59mm long. A 180mm Sironar N was 57mm long. So don't look just at the focal length and assume it should be in a 0 shutter. This was quite a big lens for its focal length. Not as big as the 115mm Grandagon 6.8 but that lens was also in a 1 shutter.

  5. #5

    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    954

    Re: Sironar N 120mm

    That is what I am confused about. 90 4.5 in copal 1 doesnt look odd to me, coz one step up is the 115 f6.8 in copal 1.
    120 sironar-n is totally odd in the line up. besides, 120 sironar-n is still a plasmat, I expect it to be inline with 100 and 135. Was Rodenstock trying to use a different formula?

    Quote Originally Posted by Bob Salomon - HP Marketing View Post
    Sorry, we have nothing that would stste why. But it would have to be for the same reason why a 90mm 4.5 Grandagon is also in a 1 shutter. Physical size of the threads on the lens groups. Otherwise they would have saved money and gone with a 0.

    The only tech info I have is a flyer from 3/88 that shows the 120 Sironar-N being only in Copal, Compur and Prontor Professional 1 shutters and its having an image circle of 175mm. It was quite a bit larger then the 100 and 135mm Sironar lenses. They had a 40.5mm front filter thread while the 120 had a 52mm filter thread.. In fact it was also larger in diameter then the 150mm and only the 180mm and longer had a larger filter size. Also it had a 51mm diameter rear mount. That was the same size as the 180mm Sironar-N as well. The 150mm had a 42mm rear mount diameter. Lastly, the 120mm lens was 59mm long. A 180mm Sironar N was 57mm long. So don't look just at the focal length and assume it should be in a 0 shutter. This was quite a big lens for its focal length. Not as big as the 115mm Grandagon 6.8 but that lens was also in a 1 shutter.

  6. #6

    Join Date
    Sep 1998
    Location
    Buford, GA
    Posts
    13,469

    Re: Sironar N 120mm

    Quote Originally Posted by Songyun View Post
    That is what I am confused about. 90 4.5 in copal 1 doesnt look odd to me, coz one step up is the 115 f6.8 in copal 1.
    120 sironar-n is totally odd in the line up. besides, 120 sironar-n is still a plasmat, I expect it to be inline with 100 and 135. Was Rodenstock trying to use a different formula?
    Don't know and the brochure does not say. It just states that the Sironar-N was a 72 coverage design except for the 360 and 480mm which were limited by the shutter opening size..

  7. #7

    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    954

    Re: Sironar N 120mm

    Bob, do you mind take a look at this ebay item 261115530057. The seller claim it is a sironar-n 120mm in copal 0.

  8. #8

    Join Date
    Nov 1999
    Location
    San Clemente, California
    Posts
    3,445

    Re: Sironar N 120mm

    Quote Originally Posted by Songyun View Post
    ...take a look at this ebay item 261115530057. The seller claim it is a sironar-n 120mm in copal 0.
    The serial number is from 1986 per this page:

    However, the front cell diameter is definitely consistent with my 135mm Sironar N from that period, i.e. accepting a 40.5mm filter, not the larger 52mm filters Bob mentioned in post #4. Images in that listing don't reveal the focal length engraving. I'd ask the seller to provide another picture that shows it. Most probable explanation is that the seller made a mistake and it is a 105mm or 135mm. Based on the front element's apparent curvature and flare angle of the rear cell, I'm betting on 105mm.

  9. #9

    Join Date
    Jan 2007
    Location
    Sonora, California
    Posts
    1,462

    Re: Sironar N 120mm

    Quote Originally Posted by Songyun View Post
    Does anyone know this lens?
    I have seen 135mm, 150mm. But when I saw the 120mm, it surprised me, the lens is in Copal 1 shutter. Does anyone know why it's the case?
    I'm slightly dyslexic...and so, it seems like a very simple explanation...the very common 210mm Sironar-N lens does come in a copal #1 and could easily be described as a 120mm by someone like me.

  10. #10

    Join Date
    Sep 1998
    Location
    Buford, GA
    Posts
    13,469

    Re: Sironar N 120mm

    Quote Originally Posted by Songyun View Post
    Bob, do you mind take a look at this ebay item 261115530057. The seller claim it is a sironar-n 120mm in copal 0.
    Can't see what is engraved on the front.

Similar Threads

  1. Rodenstock Sironar N 5.6 120mm MC -IMAGE CIRCLE
    By Mark_Se in forum Lenses & Lens Accessories
    Replies: 11
    Last Post: 6-Dec-2011, 07:09
  2. Rodenstock Apo-Macro-Sironar 120mm f/5.6 vs. 180mm
    By David Solow in forum Lenses & Lens Accessories
    Replies: 21
    Last Post: 12-May-2011, 14:37

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
  •