Can anyone help with strange bands on film

[dglickstein]

Attached is a photograph with two faint dark vertical bands down the center of

the image. I had to use Curves after scanning it to make them more visible and

I can see them on the film too (the film is much lighter so the bands are

harder to see).

 

Data: Fuji Velvia 400RHP (120 roll), F8, 1/50 of a sec., Hasselblad H2

 

These bands only appear on a few frames on this roll. Could this be something

in developing?

 

Your help is sincerely appreciated.

 

dG<div></div>

[ronald_moravec1]

I think it is processing problem. Insufficient bleach or fix or poor agitation. Perhaps either was under replenished.

 

I can`t think of a camera defect that would do this.

[jtk]

Damaged pressure plate? Processing is more likely.

 

Do you know what kind of processing machinery was used? Wild guess: Kreonite roller transport machine (soft linear damage, lack of roller maintainance). Hard to understand how a dip/dunk or simple reel setup would cause that, it seems so even.

[dglickstein]

Thank you!

 

It was dip & dunk developing.

 

I showed the lab, they want to see the film: good idea.

 

dG

[philip_hall2]

This is a film manufacturing defect. I would contact Fuji. The lab did not produce these marks.

 

Regards

[James G. Dainis]

"...they want to see the film: good idea."

 

Yes, good idea. Too often when there is a problem with the film, people show a cropped picture made from the film. You can't see the sprocket holes, the clear areas between frames, the index printing on the side etc, to see if the problem runs through there. If I have a problem with my car, I bring the car to the mechanic; I don't bring him a picture of the car.

[dglickstein]

Philip,

 

Why do you say this is a manufacturing (Fuji) defect? Have you seen this before? Thank you.

 

dG

[randrew1]

Do these dark bands line up with the perforation holes? If so, pressure marks are the likely cause. If the film is pulled around a very tight bend, the pressure on the emulsion can cause color shifts. The perforations holes cause the film to bend slightly more in this area.

[dglickstein]

This is a 120 roll (medium format), there are no perforation holes.

 

dG

[James G. Dainis]

The Hasselblad feeds film vertically for a 6x4.5 format. Therefor, the vertical band you show is running vertically from the frame above to the frame below in the center of the film. Is that correct?

[dglickstein]

James,

 

Yes, that is correct, it feeds up/down, not left to right. Dip and dunk doesn't use rollers either. Oddly, this is only seen in a few of the frames on this roll.

 

dG

[jtk]

Do you ever wrap rubber bands around rolls, pre or post exposure?

[dglickstein]

No rubber bands, pre or post developing. A good thought though.

dG