faster film similar to across 100

To my experience Acros 100 is much nearer to panchromatic than to orthopanchromatic.
Or in other words it's a "very very light orthopanchromatic".
Real orthopanchromatic films are
- Efke 25 / Adox CHS 25
- Adox CMS 20
- Rollei Retro 100 Tonal.

Are some of you guys winging this, or have you done actual objective tests under a variety of circumstances and plotted them with a densitometer like I have? But I will admit that "orthopan" is a category, with slight distinctions between specific films, and that ACROS is a bit less ortho than Efke 25for example. Still, I've got a helluva lot of experience with this particular film, especially at high altitude,
and my results are very very predictable because I undertand how it differs from typical pan films.

I would go with T-Max 400 with T-Max devepoler.

Jeff

Michael - I've never had a problem with ACROS shouldering off, even in very contrasty mtn scenes with snow and glacial polish on granite etc. But I develop it in PMK pyro, which makes printing the highlts very
practical. But this also allows me to bring the deep shadows up onto a straighter section of the curve by using ASA 50. A wonderful film when speed isn't the priority. Jeff- TMY is distinctly grainier, at least if you print a 20X24 from 4x5, for example, has a different spectral sensitivity (as noted), different recip
characteristics, etc - a completely different animal, though one of my favorite films too.

Which is true, but I use 120 film so it is not bad!

Jeff

I'm going through my pre-backpack torment right now, trying to make the final decisions of which film(s)
to carry for a week in the high country. Best to keep things somewhat simple (after, need room for a lot
of food in the damn pack too, plus the view camera and snow gear). Like being a kid in a candy shop -
so many good choices, but you can't have them all at the same time.

The second film i like after Acros 100 is TMAX 400 in TMAX developer, i have results that i like over Acros 100, i still have 1 or 2 rolls of Neopan 400 in 120, but i will not use those quickly, i will see what application i will use those for, Also whatever developer i will use with Neopan 400 i will be sure to watch the results and see which another 400 film can match it.