R4M ISO query

[ashfaque]

Hello Everyone,

It is written on R4M instruction manual "Film Speed Range: ISO 25 - 3200 by 1 /3 steps". Is it possible, somehow, to set an ISO of 20 in R4M? I have some CMS 20 II on their way and now I'm thinking of getting a Bessa R4M for some wide angle shots?

If not, will that difference of 5 ISO matter in films like Adox CMS 20 II, Rollei RPX 25, and Retro 80S*? FYI, I'm currently using HC-110, SPUR HRX, Acurol-N, and Rodinal.

Bests,

Ashfaque

 

[sevo]

A difference of one third stop is much less than the metering consistency you'll achieve with a plain centre-weighted TTL metering system - and it being all manual, you can compensate by hand, if you really want to...

 

[ashfaque]

Thanks sevo 🙂

 

[kossi008]

+1 to what sevo said. When I shoot CMS 20 and use the camera meter on my Ikon or Bessa, I just shoot at Iso 25/15°. If IÄm being picky that day, I set my Ikon to +1/3 when using automatic, but I've never found any difference...

 

[unclened]

also the meter only moves in 1/2 stops, which is trickier to reconcile with 1/3 stop changes in settings.