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FADU F-stop Enlarger Timer App for Android
20th August 2018

The project files for the FADU F-stop Enlarger Timer have now been moved to GitHub as that is a more appropriate place to maintain the project - but read on for an overview and release...
By martinhupfer on 28th April 2020, 07:11 AM

Hi Bob, such a great development. I found the app, installed it and wow, what a awesome tool.
Asap I ordered some Sonoff mini, ups, I should have ordered the basic. damn.
Do you have some experience with the Sonoff mini?

Cheers, Martin
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By Bob on 29th April 2020, 04:12 PM

Hi Martin. I see you got it working with the Mini. Great stuff!

No, I don't have any experience with the Mini. Do let me know if you had to make any mods and I will add it to the manual.

Cheers, Bob.
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By martinhupfer on 3rd May 2020, 12:43 PM

Today I had some hours in the darkroom with the new timer set-up.
And it's great to work with it, starting with a test strip you can find out wich the best exposure time it would be.
So only two sheets of paper for a nearly fine art print.
Of course it's the way to "work sheets" wich are the base of the rest.
But I enjoyed it very much, and stepping up or down in the main menu makes it easy to fine tune the print in f-stop steps.
Fortunately I found an old Samsung S4mini which no one uses any more, but for the f-stop app it works fine.

Using the De-Vere enlarger with 24VAC bulbs would be tricky with test strips. An 0.8 sec step to the next exposure time, because he has a mechanical shutter between bulbs and light chamber.
I'll test it and come back with results.
Yet I used my Fujimoto MD 90 for 6x6 prints.
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By martinhupfer on 4th May 2020, 10:24 AM

here's an example
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By Bob on 4th May 2020, 06:56 PM

Good to hear it is working for you Martin.

Your test sheet clearly shows the advantage of using f-stop related test strips as it avoids large steps in exposure in some of the strips, each having a similar increase/decrease in exposure.

I'm not familiar with the De Vere shutter system, but I wonder if using the app's Lamp Adjust setting might help to compensate for any delays introduced by the shutter? Adding a number there will add (or subtract if you prefix it with -) that number of milliseconds from the count.

Have fun, Bob.
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