Strange vertical stripes in adox pan 25 sheetfilms

[Usagi]

Hi,

Some of my recent photographs taken on Adox Pan 25 4x5 sheet film has been ruined by stripes that goes vertically on the negative (when viewed in landscape orientation).

These all negatives are from same box (emulsion). The problem occurs in every negative.

Before that, I used negatives from another batch and didn't had any problems. Actually liked the film very much.

But now...

Any possible explanations for the stripes? First I thought that it was caused by my development (I use Paterson Orbital whichs bottom is scratched so that film does not stick). But obviously that is not the reason.

During the last night I ran a series of test. I exposed negatives with enlargers light so that there's no camera interfering. Then I developed each negative differently and marked negatives by punch holes.

This test showed that these stripes occures always. No matter how I develop. Do I use orbital with motor, orbital's tray with 'tilting' agitation, manual shuffle style agitation in tray or use ordinary roll film developing tank.

(what this test also shows is interesting: There's uneveness in the developing with orbital, but not at the edges as I have been afraid of... But it's different story).

The scan from the one negative with enhanged contrast is in the attachment. Is this kind of emulsion fault?

 

[John Shriver]

Too regular to be a processing fault, so it must be a manufacturing fault. Send it to your supplier for an exchange.

 

[VesaL]

Do you pre-wet the emulsion with water before development starts? to me it looks like bromide drag.

 

[alkos]

Do you get the stripes on wet print as well? Looks to me like your scanner cannot cope with the density of the negative - seen it many times in my own scans...

 

[Usagi]

Do you get the stripes on wet print as well? Looks to me like your scanner cannot cope with the density of the negative - seen it many times in my own scans...

Didn't yet tried wet prints of these negatives, but the stripes are visible on the lightbox too.

I'll do contact prints just to be sure before contacting Adox.

 

[Usagi]

Do you pre-wet the emulsion with water before development starts? to me it looks like bromide drag.

Yes, I use presoak with adox films. Usually at least one minute.

One thing came just to my mind; could the 1+100 dilution cause these?
I am not 100% sure, but lately I have used only 200ml of working solution as it seems that Paterson orbital does better job with smaller amount of liquid than larger. It is designed to keep up constant flow on the paper/film so using too much liquid will cause problems with flowin (creates waves).

It could be that with previous box I used always something like 300ml.

This is also one thing that I have to check.

 

[George Collier]

You could do one test sheet in a tray, open, constant agitation (alternate the direction of the flipping) in total darkness and eliminate (or confirm) the film as a problem.

 

[rorye]

I had what looks like exactly the same stripes on a batch of Rollie 25 in 120. I never did figure out the exact cause, but general consensus was a manufacturing defect.

 

[Usagi]

Rollie 25 used to be exactly same film as Adox Pan 25 (at least in 35mm and 120 size). So this comes to close.
Is the sheet films also made by filmotec?

 

[alkos]

"but the stripes are visible on the lightbox too"

100% manufacturing defect then, if you ask me

 

[Usagi]

Wirelessly posted (Samsung 2700: SAMSUNG-B2700/XBIB2 SHP/VPP/R5 NetFront/3.4 SMM-MMS/1.2.0 profile/MIDP-2.0 configuration/CLDC-1.1)

It is confirmed to be caused by factory that adox used for emulsion coating during the time when that batch of film was made.

Now theyre using another factory with better maintained equipments. Hope that it means end for quality issues for pan 25.
The films coated by efke are different story. However i have encounter problems with films with efke label. Adox labeled have been fine which is good as there are no similar products like CHS 50 ART and CHS 25 ART available from any major manufactors.

This goes a little offtopic, but i like a Adox CHS 100 ART which stains really well in pyrocat-hd. Perhaps due to silver richness?
So i am wondering is the stain one thing behind the nice tonality? Or am i assuming too much as i havent never tested any other conventional medium speed sheet film like apx100 (rollei retro 100 if it is available on 4x5), plus-x, fp4+ or fomapan 100.