Efke100 & Efke25 with Rodinal or PMK

Hello,
could anyone tell me the developing time for these two film with these two developers (the films are 4x5")?
I have had quite good results with Efke100 and Rodinal 1:25 in this way:

N : e.i. 100asa - 6 min.
N-1 : e.i. 100asa - 5 min.
N-3 : e.i. 64 asa - 3.5 min.

Method : 1 min. presoak, agitation the first 30 sec. than 10 sec. each min.

I've not any measurement system so I'm not sure that these time are scientifically correct

Can someone help me with the developing times of the other film/developer combination (including N+2,N+1,N,N-1,N-2) ?

Thanks a lot

Giuliano Guarnieri

Giuliano, for Efke 25 & pmk try iso 12, 2 minute presoak, 45 seconds of continuous agitation, 15 second agitation cycles for 7 minutes (actual time is 7:30 with 30 seconds added for presoak) at 20c. This should be close enough to start. Be careful about exposure and development. 20% will be N+ and N- times (try these to get started).

Efke 100 use the same process and between 10 and 12 minutes, depends on light etc.

Use distilled water for your working solution, or times will not match up. tim

I use Rodinal 1+100 for Efke 25 (35mm) for 10 minutes,
2 minute presoal, agitation 30s at beginning then every other minute

i use efke / adox 100 4x5".

standard development N:

1 minute presoak!
the film is rated as 50 asa
rodinal 1+50 for 11 minutes
agitate every 30 seconds.