Gast
Hi there,
and thanks... I’ve already picked up quite a few tips from your forum, but now
my boss is pushing me :lol: !
Since Agfa went bust, we’ve been testing loads of films and developers, and today it’s Adox’s turn... I’ve got the Adox CHS 100 ART and the Adox APH09; a 1:40 dilution with 700ml
gives 17.07ml of concentrate... now my question... just how ‘fussy’ is this developer, or rather the film?!
0.07 is really a pain to measure! :ph34r:
I’d be grateful for any tips and tricks!!
Oh, and does anyone happen to know the development time for the CHS 100 in the TT Ultrafin Plus?
Wishing you all a lovely day
Best wishes
Daniela
Gast
Hi Daniela,
For precise measurements, I use a disposable syringe with the needle removed as a makeshift measuring tool. A dealer’s scale is even better, of course (every lab technician should have one to hand anyway). That should even measure down to 1/10g.
You could just set it to 800, and then have a think about how accurately you can measure out 20ml :ph34r:.
Seriously, it’s not that bad.
Btw: in Rodinal (supposed to be similar to 09), I find the 100er too strong for 35mm.
UF plus would never have occurred to me for that.
But you should definitely give Neofin a try.
Regards
Martin
Gast
Hello!
I also use disposable syringes with needles in the largest size. You can get them in any chemist’s for a few pence. With the 5 ml models, you should have no trouble measuring out 0.2 ml as well. I always draw up a little more than 1 ml beforehand and then squeeze out the air to exactly 1 ml. After that, you can work precisely with the syringe’s scale; I simply add the 1 ml to the water for the solution.
Regards, Phil
Wolfgg
Hello Daniela!
Here are a few facts about tolerances in photography:
If a film maintains its specified speed to within better than +/- 1 DIN, then the manufacturer must have their production chain very well under control; in my many years of experience, this is only the case with colour slide films from top-tier manufacturers, and even then only for a certain period after delivery. +/- 1 DIN also corresponds to an exposure accuracy of +/- 1/3 stop – who works with that level of precision all the time? Speed in DIN is a logarithmic measure, i.e. 1 DIN more means, in absolute terms, 10 to the power of 0.1 = 1.2589..., so roughly 25% higher ISO sensitivity. If we assume you want to set the developer dilution 10 times more precisely than the 1 DIN tolerance for the film – i.e. to +/- 2.5% – that means 17.07ml * 0.025 = 0.43ml, assuming that double the dilution also requires double the development time. So, as a rough guide, you could use between 16.6 ml and 17.5 ml of concentrate, and the influence of the developer dilution on the result (the density of the film) would still be 10 times less than a fluctuation in ISO sensitivity of 1 DIN. Why not try a test with two equally exposed pieces of film, using the same development time/temperature/agitation, once with 16.6ml and then with 17.5ml of concentrate, and then compare the two pieces of film. Experiments like this are important.
By the way, I always use a measuring pipette (a long glass tube with a scale) to measure out concentrates. That way, you don’t have to tip the bottle and then just clean the glass.
Regards, Wolfgang
Gast
Thanks,
I suppose I’ll pop round to the dealer’s and have a chat :)
Thanks a lot anyway, and for the little theory lesson too :)
Wishing you all happy “working”
Best wishes, Daniela
