is this a film or scan or development problem?

Discussion in 'Film and Processing' started by norayr, Jun 22, 2020.

  1. hello, I shot my first colour negative rolls with Mamiya RB67,
    the camera works fine, I shot peel apart with it, and it has no flaws.
    The films were developed by me, I believe the chemicals was fresh, at least I noticed these problems only on MF scans, not on 35mm scans. Also, 35mm were scanned with different scanner.

    this is fuji reala 100, expired of course. Scanned with Canoscan 9000F mark ii, and betterscanning holder with anti newton rings glass:

    [​IMG]

    you see, there is something strange in the sky, some vertical lines.
    this is a flickr link where you can zoom in to the image or download the full size scan: 2020-02-07-0003_mirrored.jpg

    this is Fuji PRO 400H:

    [​IMG]

    same look in the skies.
    flickr link: 2020-02-09-0007_sm.jpg

    What can it be?
    Did I mess up with development? Is it scanning problem?

    thank you!
     
  2. >something strange in the sky, some vertical lines.

    some horisontal lines, of course.
     
  3. If you look at the negatives on a lightbox (for this purpose, an iPad set to a white background will do) with a loupe or magnifying glass, do you see those lines? They look like banding from the scanner to me, but examining the negative will tell you for sure.
     
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  4. could you toss a piece of 35mm color sky into your MF scanner?
    sounds capable of holding such. If that reproduces your problem, its the scanner to blame.
     
    norayr likes this.
  5. Looks like insufficient agitation during processing to me.

    I wouldn't even attempt any colour processing without some sort of temperature controlled rotary machine to help out. The timing, agitation and temperature are too critical.
     
    norayr likes this.
  6. hm, i think negatives are clear. i can only see pixels. not sure the following photos illustrate that, because there's moire and the phone too.

    [​IMG]

    [​IMG]



    [​IMG]

    IMG_20200623_221905
     
  7. >Looks like insufficient agitation during processing to me.

    >I wouldn't even attempt any colour processing without some sort of temperature controlled rotary machine to help out. The timing, agitation and temperature are too critical.

    hm, thank you.
    may be we still have a lab which has machine to process MF in our city, but they always use old/expired chemistry, so i would trust them even less than myself.
    but thank you, i'll think of agitation. i think i did everything like described in ultrafine c41 kit's manual.

    will try to test the scanner more.
     
  8. Agreed on all counts - the negs do OK as far as I can tell from the photos. The other test I can think of is to cut them down to single frames and scan them rotated 90 degrees (if your scanner can handle that). If you do and the lines change orientation to match the scan, you have your answer.
     
  9. The vertical streaks are light leaks, the camera needs new seals.
     
  10. You may have dirt in the calibration area of the Canon flatbed scanner. It calibrates there to get the 255,255,255 value for white. Might be on the side of the glass on the outside, or more annoyingly may be on the inside.

    Scan an empty film holder and see what you get. You should get a uniform grey if you set the white and black points correctly.
     

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