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?
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?
It was available only for a couple of years around 1986 or so. Barely covered 45 and never sold well.
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.
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?
Bob, do you mind 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.
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