Development of 120 film-Chemicals

[Incroyable]

Hello,

I am fairly new to developing 120 roll film in a hands on basis. However the darkroom at school that I use has the equipment, chemicals neccessary. I believe they use something from Lauder apparently. The film is Ilford Delta 100.

My question is for the chemical process are the chemicals used for 135 film going to be the same as for the 120 development? I.e. fixer, hypo, etc. Also what about the timing? More or less or perhaps about the same.

Thank you.

 

[VoidoidRamone]

yep, it's all the same. But you do want to put more liquid (keeping the same ratios) into the tank so that you get evenly developed negs.
-Grant

 

[jim appleyard]

Chemistry is the same, volume is different and times might be different. Many photographers add as much as 20% to the time.

Try a test roll first!

 

[modafoto]

Many photographers add as much as 20% to the time.

Why is the time different with the same film in different formats?

 

[rjr]

Morten,

´cause the emulsion isn´t the same and the film bases are different - varying in thickness, in coatings, in reaction to the developers.

 

[Ole]

Why is the time different with the same film in different formats?

Because there is less need to worry about grain. TF (35mm) negatives are often made to print well on grade 3, MF for grade 1 1/2 to 2.

 

[modafoto]

Thanks for clearing this for me!

 

[rogueish]

check this place out (if you haven't already)
http://www.digitaltruth.com/devchart.html

 

[jim appleyard]

The times are often, but not *ALWAYS* different. Plus the sprocket holes in 35mm may help to add small currents during agitation.

 

[andrewmoodie]

check this place out (if you haven't already)
http://www.digitaltruth.com/devchart.html

Thanks for that link, it's really good.

I'd like to know if there are more people out there who expand their dev times when processing 120 film.

 

[Konical]

Good Morning, Andrewmoodie,

For T-Max 100 (favorite film) and T-Max 400, my processing times are generally the same for 35mm and 120/220. For the same films in 4 x 5, I'll generally reduce the time by 10% to 20% (for "normal" development) but only because I use a drum and the agitation is continuous. The other posting above are also correct to note that there can be slight changes in time with some films; checking the film data sheet is a good idea, at least as a starting point.

Konical

 

[Tom Hoskinson]

I agree with Konical and would add that development times should be viewed as starting points. You should always expect to do some testing in order to tune the development process for your film, chemistry, equipment, end use (printing, projection, scanning, etc.) and personal preferences.