I think it would be helpful if you could share a photo of your lens. The results are not normalOriginally Posted by SergioSanta
I think it would be helpful if you could share a photo of your lens. The results are not normal
In largeformat photography 'telephoto lens' has a slightly different meaning: it has nothing to do with the focal length in relation to the film format, but is used for lenses with a special constrution, making their focal flange distance much shorter then their focal length. This means they can be used on camera's that dont have enough bellows draw for the focal length. Well known examples are the Schneider tele-xenar and the Nikon tele-ed's.
Hello and thanks for the replies,
I bought the lens at a physical store where I go often.
They work with all kind large format cameras and photographic procedures, collodion, film, super 8...
The lens seems to be in order (see pics attached) but it's a simple lens without shutter.
Keeping your remarks in mind I maybe found the problem. And its a bit of a stupid thing...
This lens rear element is too wide for the SINAR copal DB shutter I work with (the 1st model, the green one).
I've discussed the problem when I bought it and we, me and the guy from the store, came up with a solution to avoid buying another shutter, specifically for this lens.
I've placed the shutter in between the two bellows...
If this is the problem, either I buy another shutter or I use the bag bellows in place of the normal one an keep it as closed as possible.
I don't have the camera with me, but here's a sketch.
Could this be the problem?
That's the problem.
I don't know how close the rear element is to the shutter, but I'm surprised the obstruction couldn't be seen either by looking back through the lens towards the ground glass or on the ground glass itself?
A modern 300mm lens on 4x5" should give very bright and even illumination.
Doesn't this lens taken #3 shutter?Hello and thanks for the replies,
I bought the lens at a physical store where I go often.
They work with all kind large format cameras and photographic procedures, collodion, film, super 8...
The lens seems to be in order (see pics attached) but it's a simple lens without shutter.
Keeping your remarks in mind I maybe found the problem. And its a bit of a stupid thing...
This lens rear element is too wide for the SINAR copal DB shutter I work with (the 1st model, the green one).
I've discussed the problem when I bought it and we, me and the guy from the store, came up with a solution to avoid buying another shutter, specifically for this lens.
I've placed the shutter in between the two bellows...
If this is the problem, either I buy another shutter or I use the bag bellows in place of the normal one an keep it as closed as possible.
I don't have the camera with me, but here's a sketch.
Could this be the problem?
Flickr Home Page: https://www.flickr.com/photos/alanklein2000/albums
Yes, it takes a #3 shutter - between the element groups not at the rear. Behind the lens the opening must be much larger than a #3 to avoid vignetting.
One solution would be to find a "top hat" lensboard that would extend foward the lens enough for it to clear the Sinar shutter mounted on the back of the front standard. I would have thought that your Rodenstock 300mm f5.6 Sironar-N MC would have come that way for use with a Sinar shutter. Maybe the original lensboard was replaced with flat Sinar board???
I’m not sure, but it seems that lens board is already a kind of “top hat”?
The SINAR shutter that I have has the same diameter as the rear element of the lens, so vignetting will always happen I suppose?
I'm going to try with bag bellows an see if it works nonetheless.
The alternative is to buy another shutter, but it seems to me that any other SINAR DB shutter will have the same problem... or the new models have bigger diameters?
Can someone advise the best solution?
These type of lenses sold without shutters must be paired with a specific SINAR DB.
Sorry for all the questions, I'm a newbie trying to swim in open waters...
Correct but not "top hat" enough for the lens to clear the Sinar shutter when the shutter is mounted on the back of the front standard. I once owned a projection lens with the same problem and had to mount that lens in its "top hat" in the front of a "top hat" Sinar lensboard.
This is the lensboard you need. I recently bought one from him and it is excellent. I am going to make a monocular viewer out of it with the right lens.
https://customcamerabuilding.com/en-...s/185271583212
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