Vignetting on the print

[thefizz]

So this has me puzzled. A print I was making today was very vignetted and I can’t work out why.

The negative was a 6x7 (slightly cropped) and the lens was a 90mm (set 2 stops down) which I have used for years. The enlarger is a Kaiser VPM7005 which has a multigrade head.

The lens ring was the correct type for 60mm to 105mm lenses and was inserted correctly and the enlarger was very well aligned.

There is no vignetting on the negative itself.

I put the same neg and lens in a different enlarger and no vignette to be seen.

Any suggestions of what else I should check on the Kaiser?

 

[pentaxuser]

So if you project the negative onto white paper what vignetting, if any, do you see? I cannot work out how a projected negative with no vignetting on it can cause vignetting that you did not see when focusing the negative and still not see when you switched the enlarger on to expose your paper?

I'd try using the back of the vignetted print you made to see what you see. If there is any obstruction then it has to show up at that point and gives you something to try to eliminate on the Kaiser

I have blades for cropping on my Durst negative carrier and it is possible to accidentally touch slightly and give a shadow effect on the paper. It depends on how you define vignetting but my definition is blocking light from the negative stage in all the corners giving that classic "old days" oval effect on the print

pentaxuser

 

[MARTIE]

It's not an enlarger I'm familiar with so I had a quick look online.
Which double condensers is the enlarger fitted with? (You'll need to take the head off in order to check)
35mm, upto 6x6, upto 6x9?

 

[thefizz]

My model goes up to 6x7. I’m going to take the double condenser out and see if anything looks off.

I should clarify when I said vignetting on the print, I was referring to the corners being lighter to the rest of the image, like a significant light fall-off, so maybe vignette is the wrong word in this instance.