Vignetting 4x5 300mm

[SergioSanta]

Hello everyone,

Long time reader, 1st time "writer".
I don't know if this is the correct "forum" or even if the question was already posted (I've made a quick search and didn't find anything).

I'm taking the 1st steps with a "new" lens on my 4x5 SINAR norma.
It's a beautiful Rodenstock 300mm f5.6 Sironar-N MC.
(I'm used to wider lenses, as I work manly with architecture)

I'v' already taken a few shots, but the last ones have an horrible vignetting.


I'm guessing this has to do with the image circle and bellows distance but I'm not quite sure how to solve it/ avoid it.
I would like your expertise on the matter before doing a couple of tests, exploring the distance to subject en consequently bellows expansion.

Thank you very much for your advice.

[paulbarden]

This makes no sense, as this lens has a 407mm image circle - sufficient for at least 5x7 and probably 8x10.
So, I have to assume you've put a lens shade on the front that is occluding the view - IE: it's too small a shade for this lens. I can't imagine how else you'd get such heavy vignetting.

[Kevin Crisp]

Paul is right, you should have plenty of coverage. You have both front and back elements?

[Graham Patterson]

My bet is on a lens hood. The effect is least on the close-up. If the image is previewed at the taking aperture this should show up, though?

[Greg]

Paul is right, you should have plenty of coverage. You have both front and back elements?

The correct front and real elements... I once bid on and won a lens on eBay that had the correct front set of front elements but the rear set of elements were from another focal length lens. Same effect of severely limiting the coverage.

[Doremus Scudder]

... or you're stacking filters maybe?

[ic-racer]

Need pictures of the lens and how it is mounted on the camera.

[paulbarden]

The correct front and real elements... I once bid on and won a lens on eBay that had the correct front set of front elements but the rear set of elements were from another focal length lens. Same effect of severely limiting the coverage.

Worth looking into - I've seen this happen before. And earlier today I spotted a Kodak Retina IIIc with a front element from a 1a that had a f3.5 Xenar lens! People do strange things just to get an item sold. But some sellers have no idea what they have, or what has been done to it before they got it. These things aren't always intentionally malicious.

[Alan Klein]

Aren't there different types of telephoto lenses for large format?

[Vaughan]

Aren't there different types of telephoto lenses for large format?

A Rodenstock 300mm f5.6 Sironar-N MC is not a telephoto design, it's a plasmat.