Gast
Hello everyone!
I’ve got my hands on a few old ORWO NP20 roll films.
Original VEB!!! The expiry date is 1992! :blink:
I’d really like to know, though...
...I’ll pop one through the camera!
Does anyone know the development settings for this film in APH09?
Kind regards,
Sebastian
MirkoBoeddecker
1+40 7–9 minutes
Mirko
Gast
Hi Mirko!
Thanks for the quick reply.
What about the agitation rhythm?
I recently tried out different intervals with a couple of rolls of Fomapan Classic 100… agitating every 15 seconds on one, and every 20 seconds on the other. To my untrained eye, I can’t see any difference yet…
… if there even is one with such a small change in interval.
What’s the rule, actually… you read different things everywhere.
There’s even talk of a 3-second tilt… for faster development.
Oh… questions upon questions!
But it’s just too interesting… this science!!!
See you later.
Sebastian
MirkoBoeddecker
Well, it’s not exactly rocket science, is it...
The intensity of development (as indicated by the density and contrast of the negative, assuming the same exposure) depends on:
1) The concentration of the developer
2) The state of exhaustion of the developer, or the age of the developer
3) The temperature of the developer
4) The intensity of agitation
5) The duration of development
6) Operational errors
Let’s rule out 2 and 6 (i.e. we develop using a clean canister, don’t pour the fixer in first, don’t load our film during the day, and use only fresh, branded developer).
That leaves 1, 3, 4 and 5.
It’s quite simple:
The higher the concentration, the more intense the development
The higher the temperature, the more intense the development
The greater the intensity of agitation, the more intense the development
The longer the development time, the more intense the development
So if the negative is too dense, you could opt to reduce one of the four parameters. If the negative is too light, you could opt to increase one of the parameters.
But you don’t do that!
(and we’re slowly getting to your question...)
What you do is:
Keep everything constant and only change the development time.
That’s why there’s a 15-second agitation rhythm.
Simply to ensure the rhythm remains constant.
There could also be a 10-second or 7.8-second agitation rhythm. That would be fine too. The main thing is to stick to one.
The differences (apart from the effect on the intensity of the development) lie in the fact that the developers finish faster with more vigorous agitation but usually result in a reduction in the compensating effect.
The effect with stand development (or to a lesser extent with development involving relatively less movement than with relatively more movement) is that the developer is used up more quickly locally at those points on the film where it has reduced (weakened) the film more. It then continues to develop there at a reduced rate until the next agitation (tilt), when fresh developer is introduced, and the highlights (dark areas on the negative) do not run out as quickly.
Conversely, in the shadows (light areas on the negative), it continues to work relatively more vigorously until the next tilt.
This improves the balance of the negative because the shadows are still defined and the highlights have not yet blown out.
On the other hand, with stand development, you often have to contend with streaks and developer runs.
APH09 is very balanced. You will hardly notice any difference between a 15-second shake and a 10-second shake.
Best regards,
Mirko
Gast
Mirko....you're the best!!!
Thank you so much for your kind help....and the Berlin dialect sounds absolutely brilliant too:
"Hm, well, it's not exactly that scientific, is it...".
In the meantime, I’ve looked at loads of websites on this topic. I’m ‘slowly’ getting to grips with the whole thing. On the one hand, I’m reading articles with great interest about dynamic range, gamma values, densitometry and so on and so forth...
YES... and then come the first developments above my bath, negatives hung up to dry right above the loo, exploding opal lamps (seriously!) and...
.... it’s great fun!!!
I think this forum is absolutely brilliant...
As I’m just getting started in this ‘science’, I can always do with some good advice.
And I find that here.
Mind you, I can imagine that the pros might be fed up with always
having to explain the basics... well, and... that’s exactly why I’m grateful to you.
Thanks for the help.
Kind regards,
Sebastian
