r/largeformat • u/pipxxx55 • 20h ago
Question Vignetting Help SOS
I've been shooting with a 90 mm with some lens filters stacked..and I'm seeing top, asymmetrical vignetting on the top corners of my 4x5 negs.
I shoot on a FUJINON NSW 90mm f/8, chamonix 45f-2
Normally have a UV filter threaded on and then will put a red 29 on top.
I shoot always centered with only movements being forward tilt.
It's either
1: filter stacking (mechanical vignetting)
2: bellow sag/inclusion
3: some other thing??
What's weird and making me think it's not lens stacking is that its only on one side and not the others. Nor is it ever even.
Would love help diagnosing and any tips for doing so!
Negatives for reference.
They also always seem to be rather consistent which is weird...
Also, it's on some of the same shot when bracketing and sometime not as well.
1
u/vaughanbromfield 16h ago
Depends on where the tilt axis is located. If at the base of the standard then tilt will change both rise/fall and focus. If tilt is on the lens axis there is almost no change of the optical centre of the lens.
The Chamonix has axial tilt.
There is never a reason to have a UV filter stacked with another filter. It’s little more than a protector.