Pan-F 50 artifacts, whats going on here?

Nikanon

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It looks like silver climps near the edge of the film, but firmly in the image area. Any idea what causes this? I used Xtol and agitate every 30 seconds.
 

Sirius Glass

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We need to see the whole negative, but I strongly suspect air bells. When you pour in each chemical, give the tank a hard thump.
 
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Nikanon

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Sirius Glass said:
We need to see the whole negative, but I strongly suspect air bells. When you pour in each chemical, give the tank a hard thump.
Click to expand...

Do you mean to see outside the image more or the actual negative? I have always, for my 15 years of experience or so, thumped the tank pretty good both when the chemical goes in and directly after each inversion cycle
 

Sharktooth

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Dark spots in you positive image mean the negative has clear spots. Check your negatives with a magnifier to see if there are clear spots in that area. It wouldn't be silver clumping, since that would result in light spots in your positive image.
 

pentaxuser

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Is this the only negative affected and have you used Pan F previously without any such effects? If you have can you recall if there was any differences in the total process compared to this process with Xtol?

Is this a print done under an enlarger from the actual negative we are looking at or a scan of a negative that has been reversed?

Thanks

pentaxuser
 

ooze

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Interesting. I had the same thing on some rolls/frames of 35mm FP4+ (mostly about three years ago iirc, with non-expired film). Never managed to find the cause.

What do you mean by “silver climps”? Btw, this has nothing to do with air bells.
 
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Nikanon

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Everytime I use Pan-F I seem to get this artifact. This is a direct scan of the negative
 
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Nikanon

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I wasn't thinking about the reverse aspect, for as long as I've done this and the most detailed aspects of chemistry and physics I studied, I still make dumb comments like that! It has to be something that prevented development in that area and would be lighter on the negative
 

koraks

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250swb said:
It looks to me like it's been either scuffed or something has stuck to it.
Click to expand...

Agree.

Nikanon said:
Everytime I use Pan-F I seem to get this artifact.
Click to expand...

My first thought would be either a transport or reel loading issue in combination with what is probably a fairly fragile emulsion. Do you get it with different cameras as well? Do you have different reels or even development tanks you could use?
 

pentaxuser

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Nikanon said:
Everytime I use Pan-F I seem to get this artifact. This is a direct scan of the negative
Click to expand...

Thanks so it is every Pan F roll that has this artifact? However is it every frame? Are all your pics taken with the same camera and processed with the same equipment?

We really need to be able to narrow down the problem

pentaxuser
 

B+WFriend

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I use a lot of PanF and the emulsion is fairly thin and fragile by comparison to more modern films. I agree that a further work down of equipment and process would help eliminate variables. In my own work flow I use so much of the same equipment day to day that the cause of any defect is pretty apparent. I do a presoak and develop with diluted chemistry to slow the times way down. That has improved my tonal values and decreased defects due to processing.
 
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