Maybe still interesting to read the whole thread and the links.
Yes, Fomadon R09 will be slightly cheaper than Rodinal R09 but this is a complete wrong decision to use a particular developer anyhow.
Going to the 500ml Rodinal packing the difference will be neglectible here in Europe.
Main difference is that R09 can fail after some time in use and Rodinal will not (I am talking in a few years time span now).
Getting back to our reference test with APX 100 (new)/Rollei Retro 100 you can see that the grain is more pronounced with R09. Looking at our APX 100 negatives themselves, the acutance and sharpness are both in the same order with THIS film under test.
The main problem for the R09 after months (a year ?) in use will be the decision when to dump it. The developer will still have the same color. Same problem is valid for e.g. Kodak Xtol after 6 months or so. Also still the same color and suddenly they can fail!
Well, I hope to give you all more insight information in these two para-amino phenol developers. And for those who are thinking Fotohuis is giving crappy
information:
We are also the Dutch Foma distributor.
Best regards,
Robert