Fuji Acros - Orthopanchromatic?

[BobNewYork]

I'm starting over and looking at new films to try and I just glanced at the Acros spec sheet and noticed that it is classified as "Orthopanchromatic." Isn't that an oxy-moron like "Government Intelligence"??

Bob H

 

[Trond]

The term orthopanchromatic is used to describe a film with reduced red sensitivity compared to panchromatic film. The colour sensitivity is supposed to match the human eye more closely than panchromatic film.

Trond

 

[BobNewYork]

Thanks a lot Trond. Hadn't heard that one before.

 

[Trond]

Efke 25 and 50 are also orthopanchromatic films, if I remember correctly.

Trond

 

[thebanana]

Acros 100 is a great film. No reciprocity failure to worry about.

 

[Stefan Findel]

I'm starting over and looking at new films to try and I just glanced at the Acros spec sheet and noticed that it is classified as "Orthopanchromatic." Isn't that an oxy-moron like "Government Intelligence"??

Bob H

It is. And the only way to get it properly exposed is to use a Zone VI modified Pentax spot meter. It really is a color transparency emulsion, which, properly developed, yields a bw negative. (Sorry, I couldn't help myself.)

 

[markbarendt]

Trond,

APUGers constantly amaze me with these little gems of knowledge.

Thanks

 

[ath]

While Acros is named "orthopanchromatic" the results show that it is in reality more panchromatic.

 

[Jeff Kubach]

I have used Acros over the years and I like a whole lot.

Jeff

 

[Tom Stanworth]

acros is not orthopanchromatic to the extent of the slow efke films.

 

[AgX]

With all these designations we should have in mind that spectral sensitivity falls into
-) the extent of sensitivity in terms of wavelength
-) the extent of sensitivity at a given wavelength.

So even a film with a somewhat lesser extent into the red could be `more panchromatic´ due to some relative peak.
Anyway, to my knowledge all these designations are not standardized. And when you look at all those spectral sensitivity curves published so far, one will see that designating them all would be difficult.

 

[Anscojohn]

In ye oldene dayze, we called it a Type B emulsion, iirc. Plus X, for example, was (originally, at least) a Type B. We shot 4x5 Kodak Super Pan Press-B (ASA 125) a lot. Tri-X was a Type C emulsion, with slightly greater red sensitivity--what Trond said. I (truly) think it was easier to keep B and C apart. And Type B is a lot easier to spell than orthopanchromatic(grin).

 

[BobNewYork]

Suck it and See

I've used TMX for a long time and had it doing what I wanted in Xtol and Rodinal but I've been seeing the compliments Acros has been getting here on APUG. I'll just have to run a few comparison rolls to see if it works for me.

Reason I love APUG is that there's just so much knowledge, experience and experimentation happening. It highlights ideas to try, new ways to think - and now, with spectral sensitivity curves to ponder, new ways to make my brain hurt. (Not that it takes much nowadays)

I appreciate the help here guys.

Bob H

 

[BobNewYork]

Sorry. Should have said "Thanks for the help here guys and guyesses"

Bob H

 

[Anscojohn]

In Eastern Pennsylvania "Guy" was generic for whatever gender. In Northeastern PA, it might be "youze guyze." In South Western PA, it was "yoonz. Harder to keep track of than the spectral sensitivities of Type B, Type C, and orthopanchromatic, methinks.

 

[BobNewYork]

Think you're right John. Although my brain's still a-hurtin' !!!

Bob

 

[Willie Jan]

It is. And the only way to get it properly exposed is to use a Zone VI modified Pentax spot meter. It really is a color transparency emulsion, which, properly developed, yields a bw negative. (Sorry, I couldn't help myself.)

When i read the http://www.butzi.net/articles/zone VI worth it.htm website, i see a max difference of 1/3 stop with the zone VI meter. Why would it be the only way than?

 

[Stefan Findel]

Hi Willie Jan,
Sorry for the confusion! When I read Bob's post referring to 'Government Intelligence' as an oxymoron, I could not help myself but to make some smart remarks orf my own. Of course I agree with Paul Butzi's ramblings about modified meters and Fred Picker (you just made me read that, I had long ago drawn my own conclusions.)
Oh, and a color transparency film producing a bw neg was meant to be an oxymoron, but come to think of it, that would actually be possible. Maybe I should stop trying to be funny. Forgive me!
Stefan

 

[Willie Jan]

Hi Willie Jan,
Sorry for the confusion! When I read Bob's post referring to 'Government Intelligence' as an oxymoron, I could not help myself but to make some smart remarks orf my own. Of course I agree with Paul Butzi's ramblings about modified meters and Fred Picker (you just made me read that, I had long ago drawn my own conclusions.)
Oh, and a color transparency film producing a bw neg was meant to be an oxymoron, but come to think of it, that would actually be possible. Maybe I should stop trying to be funny. Forgive me!
Stefan

where would the world be without funny people....

 

[BobNewYork]

......... Maybe I should stop trying to be funny. Forgive me!
Stefan

Trying, ( and succeeding) to be funny beats being a miserable old goat any day of the week..

Bob H

 

[StorminMatt]

Acros 100 is a great film. No reciprocity failure to worry about.

On the other hand, for whatever reason, Acros cannot be processed in dr5. Neopan 400 can be processed in dr5, but can only be processed as sepia. I'm not sure what it is about Fuji B+W and reversal processing. But generally speakng, Fuji B+W is not for slide aficionados.

Oh, and a color transparency film producing a bw neg was meant to be an oxymoron, but come to think of it, that would actually be possible.

Very true. A B+W negative is actually the first step in the processing of Kodachrome.

 

[wogster]

On the other hand, for whatever reason, Acros cannot be processed in dr5. Neopan 400 can be processed in dr5, but can only be processed as sepia. I'm not sure what it is about Fuji B+W and reversal processing. But generally speakng, Fuji B+W is not for slide aficionados.



Very true. A B+W negative is actually the first step in the processing of Kodachrome.

Isn't a B&W negative also the first step in E6?

 

[Poohblah]

This thread has only reinforced my love for Acros.

There's a reason I have about 26 rolls of the stuff in my fridge.

 

[mike c]

Just bought 10 rolls of arcros and neopan 120. What developer works good ?,I was thinking of useing hc110 1:63.

 

[Poohblah]

HC-110 1+63 is my choice. 6.5 minutes or less works fine for most situations, but I have to go for 7.25 to 7.5 min to bring some life into the Holga negatives.