Speed difference between Acros II, TMX, and Delta 100 at same CI?

[Augustus Caesar]

Sounds like a Zone System speed, not a speed determined according to ISO criteria.

No, determined by ring-arounds and printing. Developer was Acutol. There is no way Acros is 100.

 

[ic-racer]

For most purposes, the CI wouldn't matter in a practical test of speed using delta-x criteria.

 

[Andrew O'Neill]

No, determined by ring-arounds and printing. Developer was Acutol. There is no way Acros is 100.

For you. For someone else, it may be different. Why must you always think "my way or the highway"? ISO's/EI's are personal.

 

[John Wiegerink]

No, determined by ring-arounds and printing. Developer was Acutol. There is no way Acros is 100.

I get a solid speed of 320 with Acros, according to ISO criteria! I've said this at least ten times on the site that no meters are exactly the same, nobody meters exactly alike, not people point there meter in the exact same spot................! I haven't even mentioned camera variance or different developing techniques etc.. Your EI 80 is my EI 125 or my EI125 is your EI 80, da, da, da.

 

[Milpool]

No, determined by ring-arounds and printing. Developer was Acutol. There is no way Acros is 100.

Printing is the best way to determine the EI you prefer to use, but the ISO speed is 100. Foma films seem to be the exception as the data sheets for those films indicate the nominal speeds on the box are really EIs, not ISO speeds.

Maybe Acros doesn’t quite reach full emulsion speed in Acutol.

 

[Milpool]

Agree. It moves relatively little versus a simple fixed density criterion.

For most purposes, the CI wouldn't matter in a practical test of speed using delta-x criteria.