Acros with red filter ?

[Peter_Jones]

Has anyone had success with a red filter on Acros ?

I ask as there seems to be a majority opinion on the web that Acros lacks red sensitivity and responds poorly to a red filter, however a google image search seems to show plenty with dark skies, cloud detail etc.

I know the best way to find out is to try it myself, but just want to know if I'm barking up the wrong tree before I waste any rare good skies/sunshine (if you know what I mean)

 

[sparrow6224]

From what I understand and please do correct me if I'm wrong, it's not red sensitivity you're seeking with the filter, but the strong diminishment of light from the blue end of the spectrum. If red is no good on Acros you can always try yellow and yellow-orange which are also blue blockers to a lesser degree. I used to shoot a lot of Acros and I don't remember trouble with filters but I tend to use orange more than red.

 

[stratcat]

I've shot Acros in 35mm with an orange filter and I'm happy with the results; nice, deep, dark gray skies, if only a little grainy (developed in Rodinal).

Recently I shot a couple rolls of Acros in medium format with an orange filter too but I haven't developed and scanned those.

 

[sevo]

With orange or light red filters (25) it needs about a stop more compensation than average pan film. Above merely having low red sensitivity, Acros seems to end well within the still visible range. In my experience the deepest visual red filters (which already need 4-8 stops compensation with pan film, and a mere 2-4 stops with "traffic" films like Ilford SFX) will pretty much blind it.

 

[ath]

Works well, even with a 29 red filter. You just have to find the correct exposure. In case of TTL make a few exposures at different compensations (say 0, +1, +2) and decide from there. For non-TTL metering I would start with the factors stated in the film datasheet (not the filter datasheet!) and go from there.

 

[ZorkiKat]

Acros does not lack red sensitivity. Just a tad less sensitive to red than other 'pans'. It is orthopanchromatic, meaning, it still will respond to red. Using red or orange filters is possible. Just like what has been said earlier, a bit more - a stop more- than the usual red compensation is in order. I've used it with #25 red, no issues at all.

 

[shimokita]

I have done tests and it's progressive with Acos when using YELO, OR, and RD filters...
For my conditions, I have a preference for OR, but best to do some test shots...

Casey

 

[k__43]

I shot acros with dark red, seems ok to me. Although I have not printed from this film yet so it might turn out that I'd need a 00 filter to control the contrast



Untitled by Kay__K, on Flickr

Untitled by Kay__K, on Flickr

 

[mfogiel]

Acros in Rodinal (Orange filter)


MF20080304 by mfogiel, on Flickr