Odd lines on Negative

[grantwesthoff]

<p>Hey everyone, sorry if this is under the wrong forum/category but I didn't see anything pertaining to scanned film and figured my problem is in the processing of the film. Anyway, here is my issue:<br>

<img src="http://i.imgur.com/T7peu.jpg" alt="" width="1000" height="509" /></p>

<p>I have these very obvious vertical lines (they run parallel to the length of the film, not perpendicular) across many, many rolls and have no clue what the culprit is!<br>

Has anyone had this before and if so, is there a way to prevent it?</p>

<p>-Grant</p>

[thirteenthumbs]

<p>If they are on the film when you look at it then it is processing, if the film is clean (no streaks) then it is the scanning.<br>

Most likely cause is the agitation technique is not appropriate for the tank/reel combination you are using.</p>

<p>Please list the film format, tank/reel combination, and agitation technique and interval you are currently using.</p>

<p>A prewet (prewash) may help.</p>

[nealcurrie]

<p>Almost certainly agitation issues. I've had these.</p>

[zensphoto]

<p>I have seen this before, but what would really help is if you explain how you developed the film in the tank, what tank you used and what agitation method you used so we can stop guessing and make a better educated answer of what might have happened.</p>

[john_shriver]

<p>Are the on the film, or are they a scanning artefact? Use a 5X to 8X loupe to look at the film. If you don't have one, a 50mm lens used backwards makes a fine loupe. Do you see these density variations by eye?<br>

If you are scanning the film with a flatbed scanner, there are two possibilities. The most likely is that the glass is dirty in the "reference area", where the scanner scans nothing at the top of the frame to calibrate the CCD array against the list source. There's normally a cut-out in the film holder there. The less likely is that the scanner is junk, and that the gains of the different pixels in the CCD are dramatically different, and it can't recalibrate for that.</p>

[g_trout]

<p>Is it fron the same camera? if so, look at pressure stress..kinda like lookin for scratch problems..flawed/dirty pressure plate, film guides, takeup area, etc<br>

I've seen similar on 120 film</p>