Topic: Fomadon LQN 1+14

[cs1]

Just a quick word of warning when using Fomadon LQN. The normal dilution is 1+10. However, according to the datasheet you can also use a dilution of 1+14. Beware that there're strange developing times floating around the net when using 1+14 (e.g. 12m30s for Fomapan 400). These times seem to be wrong! Foma's datasheet is a little hard to read. At some point they speak about some factor 1.4, though it's unclear whether it's the factor you need to use when using the 1+10 developer dilution for a second film or if it's the factor when using a 1+14 dilution.  I've developed one Fomapan 400 for 12m30s in a 1+14 dilution using the times from the net and the film came out underdeveloped. I've then developed another Fomapan 400 for 13m20s which is roughly 9m30s x 1.4. The film turned out fine so this seems to be the correct developing time. I'd say that for a 1+14 dilution you just need to multiply the 1+10 developing times with 1.4 to get the correct developing times.

[Francois]

Good to know.
I don't know why some people go through the trouble of posting erroneous information on the net. If they want to keep their little secret to themselves, they just have to keep quiet, that's it.

I ran into a similar problem with the Arista.EDU Lith 2.0 film. Everybody says it's a 6 ISO film when in reality it's a 3 ISO with a very steep characteristic curve.

[cs1]

The Massive Dev Chart fortunately doesn't seem to have wrong times for Fomadon + Fomapan. I guess that this is quite a common reference site for developing times. My go to Android app that I use as a development timer seems to have 12m30s. However, the user database of the same app has a much longer average time (~13m30s). All very confusing. Anyhow, 13m20s seems like a pretty solid time and it makes sense together with the 1.4 factor in Foma's datasheet. I'll try Fomapan 100 next week. Today's film was a 120, the Fomapan 100 that I have is a 135. But the times should be the same.

[Francois]

Development times for 135 and 120 are usually the same or pretty close.