CV 15mm vs. Velvia 50

I just looked at some of my shots made with Velvia (can't remember if Velvia 100 or 50, probably 100) and 15mm CV, and there is a touch of fall off, but nothing like what you've shown above. Are you sure it's not atmospheric conditions, more than the lens?
 
I have this lens. The light falloff is a problem even with color negatives. Negatives have a lot more tolerance for overexposure, so I overexpose 2 stops to get the corners decently exposed. I can then use a circular gradient in software to remove central hot spot.

The same problem also occurs with the 21 f/4 Skopar. It gets less as that lens is stopped down. So, you may want to try stopping down the 15mm lens to f/8 to see if the corners will improve a bit.

An alternative with slides is to make two exposures (if the camera is on a tripod), and merge the two images in software. Of course, one exposure needs to be 2 stops greater exposure than the other one.
 
Well, there must be light fall off, but it may be made look worse if the scanner is poor and can not extract the shadows well - artificially boosting the contrast and so making the fall-off more pronounced.

Still - a center filter would probably be a good idea. I have seen images from the 15 with light fall off being obvious with BW film - the Velvia has much more contrast.

The light fall-off is at least 1 stop (and probably more) - indeed very visible with Velvia. Stopping down can not eliminate it all (it is just physics).
 
It was stopped down to f11 or even f16.
Tried various settings with my scanner (Canoscan 8800F) and yes one would be able to pull some out of the shadows.
But I just wanted to share the experience so others will know before they go on a trip and pop a roll of super delicious Fuji Velvia 50 in and start taking images...
Center filter is a good idea dough ;-)
 
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