Looks like this on my phone. Before it shows the time there's a note saying to hit calculate. Maybe send a note to the developer via Google Play. There's another app but that seems to make a guess based on extrapolating values.
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I've got that as well Chris and I really don't understand it at all. Where's @steveo_mcg when you need him?
What sort of phone do you have, Andy?
I've got that as well Chris and I really don't understand it at all. Where's @steveo_mcg when you need him?
you have magical answers (evidently ) in reciricol failure timesalright dudes, whats going down in groove town.
reciricol failure
reciricol I am a published expert, I know nothing about taking film photographs at night though..
Oh that's OK cos the shot I have in mind will be taken in the middle of the day .......
It's just that it's gunna be in a building with shadows like one finds in a coal cellar
Ah, I can only help with coal cellers when there is a black cat involved, I've specialised in wild life photography.
This shows different values from the apps for Ilford Delta
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OK, the tick box line is at the very bottom of the screen on my phone, and there's no way to move the screen down. Looks like the developer wrote it for a larger screen resolution and missed something out...
EDIT: FWIW the note that @steveo_mcg sent me had "actual" times of 3:50 for Delta 100 based on a 120 second exposure, so much closer to the Reciprocity app than the Exposure Assistant values!
EDIT again: I have now emailed the developer, also giving him a link to this thread. It's a free app so we have no right to expect anything, but it would be nice!
Did you ever make up that crib sheet you were thinking about? @Nomad Z was asking for my data and I can't find the stuff I sent on to you. I'm sure it would be neater than my tables.
Did you ever make up that crib sheet you were thinking about?
I must admit I'm very surprised that the reciprocity effects for Delta and FP4 are supposedly the same, given they are supposed to be such different films!
It's also interesting that Asha's exposures metered at 4 and 32 seconds (presumably shot at 12 and 256 seconds) came out properly exposed, given that Kevin suggests the "old" values would have been 9 and (maybe) 170 seconds, and the "new" exposures would be 6 and (maybe) 80 seconds (the maybes are because Kevin gives values for 30 rather than 32 seconds, and I'm not good at extrapolating in a power space!). I'm guessing this shows that Delta is an extremely flexible film as far as exposure goes.
I asked this question on twitter to @filmdevelop and got several answers. @PanamStyle suggested that if I devved it as per normal, "highlights may be blocked; accentuated grain; depends on several variables". @tripcodeuser said '"less dev, more light" is same as pulling film. datasheet is rephrasing ansel adams' and went on to recommend stand or semi-stand dev to handle varying EI on the same roll, which is fine except it won't work with a Rondinax tank. @LBWheaton said "Sounds like they assume low light would be a high contrast night shot (like under street lamp) so the 'pull' to tame contrast?", to which I replied "that actually makes a lot of sense. Guess I’ll have to try taming contrast in pp. Thanks for the thought."
While the Ilford figures are now the same, this seems really odd to me as presumably the physical chemistry (*) of the films are very different?Also don't forget that the reciricol failure is the same for FP4 although without experimentation I don't know if that film will behave in the same manner as Delta.
While the Ilford figures are now the same, this seems really odd to me as presumably the physical chemistry (*) of the films are very different?
* If that's the right term for the crystal structure/gelatine mix etc...
Hi,
I also shoot Delta 100 (4x5), and shoot with a center-filter (2-stop) and a polarizer (1.5 stops). I meter with an incident meter.
Got fed-up trying to calculate the appropriate exposure time whilst stood in the cold, so I made a spread-sheet with all the filter-factors across the top against measured exposure down the side (adjusted for D100 reciprocity factor 1.26). Print and carry in your bag.
Hope this helps.
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