Massive Dev app

[jtomasella]

So today I shot some Tmax 100 and there were two ISO'S for 100 one had a period after it like this 100. One was 5:30 and the one with the period was 7:30. I split the time and went with 6:30 and the negative looks great. Anyone know why there is two different times? Is one for an older version of Tmax?

[otto.f]

I never saw any explanation about these different times which are not seldom offered for film-developer combinations in the Mass Dev App. I only know that for my enlarger head with Leds (Heiland Splitgrade), I mostly need about 15% longer development times than the app gives. I also suspect that many times are just taken from the original factory’s time/developer recommendations and whether these are meant for condensor or cold light heads is never explicated as far as I know.

[Jim Noel]

the times have been sent in by individuals, not developed by a single person, or company.

[Pieter]

I never saw any explanation about these different times which are not seldom offered for film-developer combinations in the Mass Dev App. I only know that for my enlarger head with Leds (Heiland Splitgrade), I mostly need about 15% longer development times than the app gives. I also suspect that many times are just taken from the original factory’s time/developer recommendations and whether these are meant for condensor or cold light heads is never explicated as far as I know.

I wasn't aware the Massive Dev App had print times.

[jtomasella]

the times have been sent in by individuals, not developed by a single person, or company.

Thanks. Splitting those times actually worked well. There was also the same scenario for 35mm Fomapan 100.

[jtomasella]

I wasn't aware the Massive Dev App had print times.

It doesn't, I think he miss understood.

[otto.f]

It doesn't, I think he miss understood.

‘he’? I think Pieter misunderstood. I was only talking about developing times for film. I need harder films for my enlarger with Led lights than I used to need for my condensor enlarger. This is not relevant for printing times but for gradation of the paper

[otto.f]

the times have been sent in by individuals, not developed by a single person, or company.

And we don’t know what kind of light source these individuals use, which is very relevant for the gamma value of the negative you need

[j.e.simmons]

You develop negatives to best match how you print. If you’re going to use a condenser enlarger, your negative development time will probably be different than if you use a cold light. That’s what Otto is talking about.

[drew.saunders]

You don't specify your developer, but if I use the web page, and allow all developers, I notice HC 110 dilution B has both a 7.5 and 5.5 minute listing. Hopefully this URL gets the search for you: https://www.digitaltruth.com/devchar...=C&TimeUnits=D
Anyway, what the web page offers, that the app may not, is the "notes" column. The 7.5 minute version has "note 29" which the 5.5 does not. Note 29 is:

Note [29] Data is taken from a previous version of this film. Starting point time should be similar.