Rivergoat wrote:

I'm thinking I was right on the border of exceeding capabilities on a
recent high altitude shoot. Using a Nikon N90s with circular polarizer
and an 81B warming filter (sorry, I just can't afford a warming
polarizer just now), and the lens hood (on a 24-120 Nikon), some shots
seemed to exhibit a slight vignetting. I am assuming that's due to the
stacking? Is there a rule of thumb, should I be best off not using the
hood when I need to stack? All in all, though I still got some very
nice shots on the trip....

So ... post the phots!

Stacking is a good way to get vignetting at the wide end at large
apertures.
In particular if you also had a UV/Skylight filter, plus 81B plus
the pol it becomes pretty much guaranteed.

The hood may make it worse if it is pushed out... with my circ
pol, a threaded hood cannot be used.

Rule of thumb: if you stack, think about aperture and FL
contributions to vignetting. Wide aperture and wide FOV will
vignette many lenses _without_ filters ... adding them just
increases the liklihood.

Cheers,
Alan


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