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  #1  
Old 4th July 2018, 04:59 PM
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Default Ilford Film Reciprocity Failure - New(ish) Info.

The inclusion of the same reciprocity failure chart in all of Ilford's film data sheets has always made no sense as the films clearly have different characteristics, along with Ilford/Harmanís insistence that they stand by the charts when challenged on them has finally changed!

Not sure if others have already seen this but a new(ish) document (dated Aug 2017, but I have only just tripped over it) on Reciprocity Failure has appeared on the IlfordPhoto site that gives a calculation for each film:

https://www.ilfordphoto.com/wp/wp-co...mpensation.pdf

I still have no idea how accurate it is, but at least they have finally admitted there are differences and I can try it for myself next time I am out shooting at slow shutter speeds.

Cheers, Bob.
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Old 5th July 2018, 07:26 AM
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I have used this new data with FP4+ and it worked for me. Just need as calculator with you.
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Cheers, Barry
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Old 5th July 2018, 09:43 AM
Michael Michael is offline
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Thank you, Bob. I've downloaded the pdf for later use.
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Old 5th July 2018, 12:30 PM
Svend Svend is offline
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Thank you Bob. Very helpful. I have downloaded to phone and PC. That will be easier to use than trying to decipher a squinty chart in the dark

Regards,
Svend
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Old 5th July 2018, 02:30 PM
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Well I never.
My phone calculator turns scientific if I use it landscape.
And, the calculator on my PC does tricks I didn't know about.
Thanks Ilford.

I'd actually like little graphs for PanF and HP5. I have one for Fomapan 100, and the generic Ilford one, printed and laminated in my bag.

Will have to join 21st century and give the calculator trick a try. When out and about I do carry a phone, so I have a timer available for long exposures. It's also got a sunrise/sunset app which is handy, but my 'phone is so elderly I can't get The Photographers Ephemeris to run on it.
That is actually really good for planning things like where and when the moon will rise, or at what time of year the sun will set in a given direction.

As for the increased contrast with longer exposures I have run into that with Fomapan, as it has seems to show a precipitous drop off in sensitivity as exposure times stretch. The trick is to be aware, and use it to your advantage. Dim light can be very flat, and choosing a longer exposure can give an apparent boost to contrast.
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Old 6th July 2018, 04:33 PM
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Martin Aislabie Martin Aislabie is offline
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Neat - and really easy to use if you have a smart phone.

I have always thought the reciprocity compensation tables people have banded about were over generous.

Martin
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Old 7th July 2018, 08:17 AM
Lostlabours Lostlabours is offline
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Here's the Ilford reciprocity chart with the new data added.



Ian

Last edited by Lostlabours; 7th July 2018 at 08:21 AM.
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Old 7th July 2018, 11:01 AM
Mike O'Pray Mike O'Pray is offline
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Ian, thanks. I can identify all the colours against each film except the black line. What film is this? Thanks

Mike
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Old 7th July 2018, 11:32 AM
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Ian, nice work on the graph!! It'll be going in my bag(s) once laminated up.
Is the solid black line the original 'generic' one Ilford offered?
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Old 7th July 2018, 04:50 PM
Jerry Bodine Jerry Bodine is offline
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Quote:
Originally Posted by SvendN View Post
Thank you Bob. Very helpful. I have downloaded to phone and PC. That will be easier to use than trying to decipher a squinty chart in the dark

Regards,
Svend
Svend, you may want to check out this tiny LED flashlight (torch) to ease the ability to see in very dim conditions. It only weighs about 1 oz. and has more than enough output for setting shutter/aperture etc. I also find it useful in the darkroom. Here is the store's website and user manual for the E05 model:
http://www.fenix-store.com/ (search E05)
http://www.fenix-store.com/content/E...UserManual.pdf

Jerry

Last edited by Jerry Bodine; 7th July 2018 at 04:57 PM.
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