Some time ago I saw a post that included a fall off mask made to correct an un-even distribution of light arriving on the baseboard from an Omega D3 enlarger with condenser head. This mask is like a centre filter and must slot in the head somehow. I'm interested in making one of these masks because with the D3 there is a certain light fall off at the corners as compared with my cold cathode head. Any suggestions as to how to make this mask and where it must sit would be welcome. When I finally have one made and working sweetly, I'll post instructions!
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