Scanning issue - Epson 850 Pro + Silverfast + Mac

[George Collier]

Hey folks - I've been using successfully, an Epson V850 Pro for multiple formats, using Silverfast on a Mac. One issue I have, sometimes (but I can't figure out what is different when it happens.) At the edge of images which have a clean plain solid area, like a sky.
See the attached. Notice, on the left edge, in the lower half, there is a light area parallel on the edge, running up the edge, with a dark edge on its inside. I can often get rid of it with just the right use of the stamp (cloning) tool, but all control settings have to be perfect.

When this happens, I remount the neg onto a piece of ANR glass, and support the glass at the exact height needed, with the edges taped down in the rebate area with painter's tape, then scan. The issue never happens with the glass. I use the holders only because it's faster than taping all negs to the glass.
I'm thinking that this is something to do with the inner edges of the film holder opening, like a reflection. Anyone else have this issue?

 

[Alan Edward Klein]

Which formats does this happen on?

Just to be clear, are these lines only when you scan with the film holders? If so, there is a separate lens used on the top of the scanner when using V850 film holders as opposed to a secondary lens when scanning on the glass platen. You may have a problem with the scanner lens process on top.

 

[koraks]

I'm thinking that this is something to do with the inner edges of the film holder opening, like a reflection.

I think your analysis is correct. I have a much older Epson scanner and the plastic film holders are kind of shiny/reflective on some surfaces. You might try roughening up the interior edges that might be responsible for such a reflection. If you hesitate to permanently modify your holders, you could try some kind of tape that has a matte surface; perhaps even simple Scotch tape.

 

[brbo]

Anyone else have this issue?

Many V800/850 users.

 

[loccdor]

If the holder is not glass and is not keeping the film perfectly flat, you'll notice a greater slope of the curliness around the edges of the frame. That curliness could be at the right angle to catch a reflection. Think of how a shiny metal cylinder catches a specular highlight (it appears as a line).

 

[George Collier]

Thanks for the replies -
Alan - good question - only 35mm (b&w negs only) and only with the holder.
Koraks - yes I agree. I have an extra set of holders, but hesitate to modify them.
loccdor - when the negs are taped to the glass they are absolutely flat, I pull slightly to ensure this.

Well, while waiting for answers, I tried something - I rotated the neg 180, used a different strip in the holder, and the problem disappeared. I also noticed that the frame of my scan selection from the first frame was slightly smaller on the new position, so the effective size of the frames in the holder may be inconsistent based on the angle or position. The second scan has only a slight bit of edge lightness, probably standard old surge from development on Nikor reels.