BTZS, Reciprocity Codes, ExpoDev and WinPlottr

[djkloss]

hello my friends, I'm just gonna throw this out there.... I know some of you use BTZS... Hopefully receiving a short 'quick and dirty' answer...
does anyone have the BTZS reciprocity code figured out for WinPlotter, (used when exporting a film profile to ExpoDev) using HP5+ and Pyrocat-HD @ 1:1:100 around 70degs? None of the films in the database use Pyrocat.
Thanks...wish I had more time, Dorothy

 

[BCM]

Try C5 and adjust from there. The dialog under Export -> Common Films has a full list. If you are using a different developer, you can research the published reciprocity curves associated with that developer and match it to others in the list as well. I have noticed that while effective speeds can change with developers, the % change in reciprocity over printed data isn't usually dramatic. The Ilford chart gives you base values but note that they do quite a bit of rounding so the specific factor is less critical IMHO. You can also do a simulated long exposure film test to get exact values which we used to do but stopped due to the limited data it provided. https://www.ilfordphoto.com/wp/wp-content/uploads/2017/06/Reciprocity-Failure-Compensation.pdf'

 

[djkloss]

Thanks Brian, that was me on FB asking this.