Ladies and Gentlemen, I'm losing my mind. I have done this test twice now, meter the target, put it on zone 1 (stop down 4 stops), expose it, and when I check it on the densitometer it's WAY too dense. .58.
This is Delta 100 in DD-X (1:4 10.5 minutes, 68 deg) AND Delta 100 in SP-Ultra-LF (1:9, 6:30 minutes, 68 deg).
All 4 of my meters agree within ~half a stop, so I hesitate to blame the meter, it would appear it's correct, or at least correct enough to not have me on zone 5.
I've tried 2 different lenses, and also checked the shutters, they're accurate.
No light leaks in the bellows.
Oddly, Fomapan in DD-X reads .14 above film base, exactly where I would expect. When I did the test I set it up so it was f/11 @ 1/30 and both the fomapan and the delta were exposed at that setting, no changes in light levels.
It's possible I screwed up all 4 shots in 2 film holders, but I doubt it.
I've done this test before, but I admit it was 25 years ago, so I'm rusty, but not that rusty.
Anyone have any thoughts on this? Is Delta 100 really a 400 speed film? Is the development time recommended by Ilford way too long?
Appreciate any insight y'all can provide.
Edit - should include that this is a new box of delta 100 (ex 01/2027) and a new bottle of ddx, both from B&H.
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