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- Aug 6, 2016
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@thronobulax I haven't tried it 1:1 yet, this batch was mixed 12 months ago and I've just been replenishing it.
I was thinking of cutting the chemicals by 50% and just mixing up 500ml to experiment with. Any tips on using it 1:1?
I reuse it over and over. I don't worry much about developer age
So you don't add 17ml of replenisher then, you simply pour it back into the bottle
I know mine appears to be still going strong after 12 months. Do you think it is the Sodium Sulphite (anhydrous) which is keeping it alive
That's probably why many of these developer dilutions and esoteric development disciplines fell out of favor when smaller format films like 35mm took over analog photography.
This is interesting to me because I now seem to use more 35mm than I do 5x4 so I need to keep an eye on how the grain is increased on these smaller formats.
I do have another question which you may be able to answer...
12 months ago I mixed up 1L of D23 and used it solely as stock and topped it up with the DK-25R replenisher at a rate of 17ml per so many films.
Question:
Is my 1L still classed as stock meaning, could I pour 250ml into a new bottle and add 250ml of water and class that as 1:1
This is interesting to me because I now seem to use more 35mm than I do 5x4 so I need to keep an eye on how the grain is increased on these smaller formats.
Ian, have you tried Perceptol? 35mm Fp4 in Perceptol diluted 1+3 is absolutely exquisite. No grain, very sharp, and mid-tones expanded and very bright, resulting in beautiful tonality. No need for any semi-stand malarky. Just one inversion every 30 seconds. Development time is quite long so I go to 24 degrees C. 12.5 minutes for film exposed in sunshine.
35mm Hp5 is also wonderful in Perceptol. I use a dilution of 1+2. Great sharpness and very fine grain.
I have never found anything to better this. Pyrocat HD 1+1+100 comes close, but is not as readily available as Perceptol.
oday, I semistand developed a 120 roll of Neopan 100 and it worked just fine.
Have you done much semi-stand with 35mm with it, I am curious as to whether you suffered any un-even development
I use a rubber stopper inserted in the reel center opening to raise it about 1/2 inch
off the tank bottom.





I decided to do a test with 35mm mainly out of curiosity.
I poured 250ml of my 12-month-old D23 into a new bottle and added 250ml of water.
I wasn't testing for compensation at this stage, I was interested to ascertain if I got any un-even development or streaking.
Although I never measured the SBR, the image of the shells shows a hard-edged shadow so you can see the light was harsh
The film tested was FomaPan200 35mm rated at ISO 125.
Followed your times @thronobulax as a starter which was
The negatives show no signs of uneven development and no streaking. The sprocket holes and film edges are very clean.
- 3 min pre-soak
- 2 min continuous strong agitation
- Let it sit for 30 minutes
- 15 seconds of normal agitation
- Let it stick for another 30 minutes
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