We respond to all questions and claims which are brought to our attention.
Our email adress is info(at)fotoimpex(dot)de and for claims also reklamation(at)fotoimpex(dot)de.
Sofar no one has filed a complaint with us for pinholes in any recently produced 25 or 50 ASA film so I would be interested in actually seeing the artefacts you describe.
For now I can only comment in a "general way" and wait for your images or links to be posted.
There are two known main reasons for holes:
1) Bubbles in the emulsion during coating before stiffing
2) Emulsion lift off during processing
Actually only number 1 is generally refered to as a pinhole.
That is because it will be a small round hole with a circular shape and defined border.
When the emulsion is beeing remooved during development the holes are rather undefined with a random border and look "dirty".
If the pinhole was produced during the coating process obviously nothing can be done about that by the customer. Itīs a manufacturing defect and somehow slipped through the QC. The films you describe (ADOX CHS line of films) are produced in a museum-like facility in Croatia.
The facility does everything in a way it was done 60 years ago. The quality inspection is carried out like it was done everywhere before computers and laser detection came up. This way you take a sample, expose it to medium grey and develop it. Then you make 1000 films. Then you take a sample again. If both samples (beginning and end) are fine you assume the rest in the middel is fine as well and release the films to the market. If anything shows you discard the films and keep checking every few meters to see if the defects stop showing. Then you go on. There is nothing else you can do. 100% control means exposing and developing (=destroying) 100% of the film. Itīs a light sensitive product after all.
The CHS films represent the true old ADOX emulsions and are true classic films by all means. This refers to the way they are produced, images they reproduce and the way the film behaves.
Differences to modern films are for example:
- a unique colour reproduction which is giving the images its own characteristic feel. Portraits look differently on an ADOX CHS than on a more modern film, clowds separate better from the sky etc.
- an old fashioned grain style and an historic "dump in the bucket" way of precipitating the raw emulsion
- an old fashioned way of coating it in one layer and drying it over wooden sticks in a Festoon drying tunnel (the last one of this kind in operation)
- an old protective layer which is made acording to the original 50ies recipes of the film
This last point leads to a higher voulnerability of these emulsions compared to more modern film which are hard like a rock.
So theoretically an ADOX CHS film will scratch and show defects/artefacts caused by the process much faster than a modern film will.
There are several ways to prevent this from happening:
1) Donīt use a high alkaline developer together with a stong acidic stop bath (we also mention this in the box instructions). What can happen is that gas will be produced within the emulsion on the neutralization reaction and tiny patches of the emulsion are literally blasted away from the base.
2) Harden the emulsion in the stop bath by adding hardener if needed
3) Keep al things like rust, dirt, sand etc, filtered out of your water
I am telling you al this technological background because I want all of you to understand that with ADOX there are two different qualities available under one brand. All the stuff we sell at very competitive prices is made for us but not made by us.
Our possibilities to control the quality are limited to what the actual manufacturer has in place.
These products are for example:
CHS line of Films
PAN 25 films
ORT 25 films
The "Premium Line" products however are made with us beeing deeply involved in the manufacturing side and with our own quality management in place.
These products are for example:
MCC (coming soon)
ADOX Pan 100 and 400 films (coming soon)
I hope this could help for now. More detailed answers to come when I can see the artefatcs.
Fell free to ask if any of the above is unclear.
Last edited by ADOX Fotoimpex; 05-28-2009 at 12:38 PM. Click to view previous post history.