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Old 6th July 2010, 12:31 PM
JohninDublln JohninDublln is offline
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Default Film Developer times

I usually shoot Kodak T-Mak 100 and develop in Rodinal Special.
The recommendation on the chart is 1+15 for 5 minutes, now if I want to dilute to 1+25 does the time then become 8.3 minutes probably rounded up to 8.5.
I arrived at this by dividing the 15 into 300 seconds to give me 20 seconds and then multiplying by 25.
Am I right, wrong or just away with the fairies.
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Old 6th July 2010, 04:44 PM
Mike O'Pray Mike O'Pray is offline
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I have no experience of this combo, John but from what I can gather there may not be a linear relationship between times adjusted for ratios.

Hopefully others will know more but I'd wait to see what turns up by way of replies before going ahead with your formula.

I am a bit surprised that there isn't a time for Tmax 100 and 1+25 but isn't it always the way that what you want to do is the bit that's missing on the charts.

Mike
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Old 6th July 2010, 05:06 PM
Neil Smith Neil Smith is offline
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I have no experience either, but on a search a couple of people claimed 5.5 mins which seems very short if your already using 5 mins at 1:15.

Do a search in google and you should find what I did

Neil
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Old 6th July 2010, 05:17 PM
Keith Tapscott.'s Avatar
Keith Tapscott. Keith Tapscott. is offline
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Quote:
Originally Posted by JohninDublln View Post
I usually shoot Kodak T-Mak 100 and develop in Rodinal Special.
The recommendation on the chart is 1+15 for 5 minutes, now if I want to dilute to 1+25 does the time then become 8.3 minutes probably rounded up to 8.5.
I arrived at this by dividing the 15 into 300 seconds to give me 20 seconds and then multiplying by 25.
Am I right, wrong or just away with the fairies.
I would keep with the recommended dilution and time and see how it turns out.
I checked the time over on the digital-truth website, which recommends the time and dilution for Rodinal-Special to be used exactly the same as Agfa Studional.
http://www.digitaltruth.com/devchart...nal&mdc=Search

I can not find any other dilutions for those developers and not sure about which development time factors for a higher dilution.

Last edited by Keith Tapscott.; 6th July 2010 at 05:23 PM.
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Old 10th July 2010, 10:42 AM
JohninDublln JohninDublln is offline
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Thanks lads,
The main reason I was asking is that I read somewhere that longer development time with reduced dilutions increases contrast in the neg.
I've just bought "Creative Black and White Photography" by Les McLean and am going to set up the negative test. There's gonna be some fun times ahead
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