Yes, indeed. I can't recall the specifics of the NASA mistake...I'm sure another reader will...but the aircraft fueling mistake resulted in a movie called The Gimli Glider. https://en.wikipedia.org/wiki/Gimli_Glider One of the most memorable movies I have ever watched, and not a whit of violence or gratuitous sex. Playing at a streaming site near you, probably. Good for the whole family.
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Developer Temperature Compensation Formula
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Yes, indeed. I can't recall the specifics of the NASA mistake...I'm sure another reader will...but the aircraft fueling mistake resulted in a movie called The Gimli Glider. https://en.wikipedia.org/wiki/Gimli_Glider One of the most memorable movies I have ever watched, and not a whit of violence or gratuitous sex. Playing at a streaming site near you, probably. Good for the whole family.
A very interestíng story, Paul, thanks for the link
pentaxuser
pentaxuser
I found an interesting link, "Thirty Years After Gimli." But that would give the story away.
I found the movie on YT:
A fascinating discussion. mainly in 2008 and between 2-4 of out "old stalwarts" but from a practical point of view of the average amateur home processor of film, what advice should we give the next newcomer who wants to know what time to give a film if the temperature is different from the standard 20C?
Do we advise that (a) he/she refers to this thread and draws whatever conclusions he/she feels appropriate but warning that said person better be good with algebraic notation and graphs and that the Ilford chart. Raph Lambrecht's chart etc are all far too simplistic to be of any use
or (b) unless the person is good at the material mentioned in (a) above then that person had better ensure at all costs that 20C can be maintained at all costs
Shouldn't someone also tell Ilford, Ralph etc that their charts are far too simplistic to be of any value
pentaxuser
Do we advise that (a) he/she refers to this thread and draws whatever conclusions he/she feels appropriate but warning that said person better be good with algebraic notation and graphs and that the Ilford chart. Raph Lambrecht's chart etc are all far too simplistic to be of any use
or (b) unless the person is good at the material mentioned in (a) above then that person had better ensure at all costs that 20C can be maintained at all costs
Shouldn't someone also tell Ilford, Ralph etc that their charts are far too simplistic to be of any value
pentaxuser
..has this been resolved yet?
Easy, develop at 20C. Warm tap and cold tap solves the problem.
What a fantastic idea, I wonder why nobody had thought of that yet.
Jokes aside through, I'm finding it rather difficult to maintain the 20°C.
Of course I can bring the developer to 20°C before pouring it in - but after, say, 9 minutes of developement in a Jobo tank that was 23°C to begin with, in a room that's 23°C my developer comes out at close to 22°C nine minutes later.
The "drifting" method (start with 19°C, to end up with 21°C for example, which is what I did for my last two rolls yesterday) while sounding good in theory does not really work all that well in my experience - which is why I was looking into this thread about temperature compensation.
For MQ developers this is infallible:
| BW Fahr Dev | 65F 2.23 | 66F 2.12 | 67F 2 | 68F 1.9 | 69F 1.8 | 70F 1.71 | 71F 1.62 | 72F 1.53 | 73F 1.45 | 74F 1.38 | 75F 1.31 | 76F 1.24 | 77F 1.17 | 78F 1.11 |
| Factor: 1.055 | 79F 1.06 | 80F 1 | 81F 0.95 | 82F 0.9 | 83F 0.85 | 84F 0.81 | 85F 0.77 | 86F 0.73 | 87F 0.69 | 88F 0.65 | 89F 0.62 | 90F 0.59 | 91F 0.55 | 92F 0.53 |
Every Ilford-Developer comes with universal charts for deg. F as well as C.
Example DDX, look at page 5/8.
Example DDX, look at page 5/8.
John Finch of Pictorial Planet had some guidelines where your developer may change temperature while processing. At the halfway point of your initial time period check the developer temp. If your developer temp drops by 1 C then increase your remaining dev time by 10%. (Or something like that). Vice versa if your dev temp rises during processing then reduce your overall developing time.
Check out his videos as I cannot remember how long ago this was mentioned. Pretty sure his whole video was based on this technique. I believe this approach was based on a starting temp of 20C. It may still work for other starting temps with appropriate adjustment.
Check out his videos as I cannot remember how long ago this was mentioned. Pretty sure his whole video was based on this technique. I believe this approach was based on a starting temp of 20C. It may still work for other starting temps with appropriate adjustment.
The massive dev chart has a tool https://www.digitaltruth.com/devchart.php?doc=timetemp
Alternatively placing the tank in a water bath at 20 degrees does the trick too. If your cold tap is over 20 degrees, then ice cubes can be used to lower the temp of the water bath, with regular monitoring to ensure it doesnt get too cold. I sometimes use a reusable gel compress, placed in the freezer so it gets very cold, to cool my developer without diluting it with melting ice
Alternatively placing the tank in a water bath at 20 degrees does the trick too. If your cold tap is over 20 degrees, then ice cubes can be used to lower the temp of the water bath, with regular monitoring to ensure it doesnt get too cold. I sometimes use a reusable gel compress, placed in the freezer so it gets very cold, to cool my developer without diluting it with melting ice
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