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  1. #1
    mhainz's Avatar
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    Just wondering if anyone has tried developing Agfa APX100 in Perceptol. Is it possible? What sort of development times would you recommend?

  2. #2
    David A. Goldfarb's Avatar
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    I haven't tried it, but it sounds like an interesting combination. The Massive Dev Chart (www.digitaltruth.com) suggests 9 minutes in straight Perceptol for an EI of 100 with the original APX 100. That's probably a good starting point.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  3. #3
    djklmnop's Avatar
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    Perceptol is similar to Microdol-x, I've found that APX 100's Exposure Index is ISO 32, and takes 18 minutes to develop in Microdol-x 75F 1:3. Your mileage may vary.
    My results were densitometry tested.

    Andy

  4. #4

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    The Ilford pdf for their powder developers gives 9min in full-strength Perceptol for APX100 at EI=50.

    I'm not saying that it's right, of course!

    I would expect 1+1 or 1+2 to give nicer results, and (sticking my neck out) would give it 11 minutes at 1+1 for my first try.

    I would be inclined to expect a low film speed as stated in the post above.

  5. #5
    Dr Croubie's Avatar
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    So, after searching and searching for an answer as to how long to do it, I just did it.
    Almost every google just turns up recipes for APX/Rodinal, I found some nice shots taken with the APX/Perceptol combo but no times.
    There's nothing wrong with resurrecting a 10-year old thread, it seems to be the only thread on the net I've found about this combo, so I may as well add my experiences to somewhere it'll be found.

    Firstly, the contradicting times (everything is 1+0, 20C):
    MDC says APX100 ei100 for 9 minutes (with note 'older version of this film, starting point time may differ'. My version were two 9x12s expiry 2004, so I figured 'older' is what I wanted).
    Perceptol packet (bought new this year) plus every Ilford literature says APX100 ei50 for 9 minutes, ei100 not recommended. This may or may not refer to any 'new' APX100 that's out there.
    Given that I'd already shot the film at ei100, what do I choose, 9 minutes or 9 plus a push? (Yes, I have rodinal around, but I specifically wanted to try Perceptol, I mixed it today for this).

    Doing some deductive work as to what constitutes a 'push up to box speed', I considered that for FP4+ the times were ei50 9 mins, ei125 12 mins. PanF ei25 is 9 mins, ei50 is 14mins. Kentmere 100 ei50 for 9.30, ei100 for 12.30.
    (Side note: the packet also doesn't make sense for HP5, ei250 is 13 mins but ei400 is 11 mins?)

    Anyway, I was thinking I'd need to push a bit past 9 mins, but didn't want to over-push just in case the MDC was correct for ei100@9mins. So I took a stab at 11 minutes.

    Results: Well, they're hanging to dry right now. One of them is sort of OK, just a bit on the thin side, maybe half a stop to a stop out? The other is rather thin. Not as thin as some of my other stuff thin, I'll be able to scan some detail into it I'm sure, but nowhere near perfect.
    More detail: the first was taken with an orange filter with a 2-stop compensation. The thinner one was taken with a CPL with 2-stop compensation. All the RVP50 I shot at the same time with the CPL has come out half a stop too dark, so that might explain the disparity between the two films. Even taking that into account, I still think I'm at least half a stop below where I should be.

    So 9 mins at ei50 sounds right, but I'm thinking next time at ei100 I'll be going for at least 14 mins, maybe more (if there is a next time at ei100, now that the perceptol is mixed I might just shoot ei50 for a while).
    An awful lot of electrons were terribly inconvenienced in the making of this post.

  6. #6
    Trask's Avatar
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    Thanks for posting this - I shoot a lot of APX 100 (when I'm shooting) and usually use Rodinal, which gives me images I like a lot. I'd be interested in using Perceptol as an alternative. If you choose to post images, that would be welcome.

  7. #7
    Dr Croubie's Avatar
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    Yeah, why not.
    Here's a scan of three shots at once (if I do them individually then it changes pareameters and the results aren't comparable).
    Top is the 'almost decent' one with the orange filter in Perceptol.
    Middle is the 'rather thin' one in Perceptol.
    Bottom is for comparison, from the same packet, ei100, 1:100 rodinal stand for an hour, to show what 'fully' dense looks like compared to the top two (although even with this one the highlights aren't blown out).
    Still, not to say that the top two are no good, but they'll just need a bit more work in the scanner/enlarger to get looking good. But I'm definitely going to add some extra time in next time I rate at ei100.
    Click image for larger version. 

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    An awful lot of electrons were terribly inconvenienced in the making of this post.

  8. #8

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    1+100 Rodinal 20C 60 mins no agitation 100ISO is what I use for old APX100.

  9. #9
    bvy
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    Perceptol is my developer of choice for Neopan 100 Acros. Beautiful stuff.

  10. #10

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    Here's a tip for using Perceptol. Accept the speed loss of at least 1 stop. If you don't, and try to get more speed by extending development time, the extra-fine grain properties of Perceptol are quickly lost and you're worse off from a speed/grain/sharpness balance than if you had used a general purpose fine grain developer that gives you full film speed.

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