Recently I have been using some quite dark filter. Deep reds, very dense ND filters (between densities 1.5 ... 4.0). All are made from gelatin.


The problem is that sometimes the lenses barrel and markings will reflect from the filter to the image. This happens with wide field lenses, like 90mm, 75mm and 65mm in 4x5" size.

The most problematic is my 75mm super-angulon, Linhof Technica-labeled and has shiny metallic barrel. From lenses with black paint finish, only the white markings will cause reflections.


I guess that the main cause is the small gap between the front of lens and the filter itself. I have tried to close that gap with black paper but that doesn't help much. Perhaps it allowed still too much light to enter to the front of the lens via corners etc.


Is there any commonly known solutions for this?