I've done a personal film speed test with Delta 3200 in Microphen stock at 20 degrees.
normal, +3 stops, - 4 stops bracketing and then enlarging the negatives onto paper with minimum time to get maximum black.
Not surprisingly Delta 3200 comes in somewhere between 800iso - 1600iso. at that rating I get acceptable shadow details that are technically correct but very flat.
At 3200 ISO setting I get much more pleasing results in terms of contrast.
I kept on increasing the development time quite a bit to get dense enough highlights.
The test here again was to expose the frame at +3 stops onto paper at min time for max black, covering half of the paper.
What I am looking for here is something close to the paper white.
I've increased the development time as much as 110%, meaning instead of the recommended 9:00 mins I am doing 20:00 minutes. I am getting somewhat dense highlights but nothing near white. I assume at EI 3200 the film is simply underexposed massively and won't ever give me dense highlights no matter how long I cook the film.
Other than test frames I've actually exposed and developed a roll of normal pictures using this technique. I still need to work with contrast filters on the enlarger but I like the results.
I am wondering what everyone else's experience with this film is.
I never heard anybody overdeveloping the film by this much. People seem to go by the Ilford times mostly.
dense highlights but nothing near white.
If I recall correctly this was always the advice that Les McLean, formerly of this forum and a very good photographer and darkroom man, used to give. It is advice I used to follow and still do with DDX originally and then Xtol. I have never tried this with Microphen but for what it is worth another U.K. member tried to establish what speed he got with various developers and concluded that only Microphen achieved full speed of 3200.So for Delta 3200 (in Microphen) would you say that expose at 1600, develop for 3200 is a decent rule of thumb?
Thanks for the reminder of what your tests showed. It indicates that my advice to Xtolsniffer is quite a way off the mark. On the Les McLean maxim you would use the next development time i.e. 6400 but this only gets you to 12 mins which is way short of 20mins.Delta 3200 in Microphen stock at EI 3200 needs the full 20 mins. A min time for max black contact print confirms that for me.
The secret of Delta 3200 is that its highlights do not go through the roof, even if you totally overdevelop the film. Take a look at Ilford's data sheet for this film: as you develop more, it gets steeper and steeper in the shadow region, but its highlight region stays mostly flat. Therefore, even if you overdevelop this film by a lot, you may still need a higher paper grade to get decent highlights. This characteristic works great for night scenes, especially with light sources within the image frame, but it tends to give too low contrast for normal scenes with soft lighting.
From what I have read about TMAX 3200, this film offers about the same ISO speed, but has a more or less straight curve. It's up to you to decide which characteristic matches your style and intended subject matter.
........... I somewhat disagree how Butzi writes about blown out highlights with Delta 3200, as this film's characteristic make it the antithesis to blown out highlights. If important subject matter (i.e. the brightly lit faces of actors) ends up in the upper low contrast part of the characteristic curve, then a higher paper grade plus some burning&dodging to keep shadow detail intact will reliably fix these issues. IMHO one should not describe something as "blown highlights" if there is plenty of accessible detail in the negative.
..........
....This is typical of what can happen when a self proclaimed expert thinks that they know more about a film than the film manufacturer.
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