mfogiel
Veteran
I'm recently looking into longer exposures, pinholes, etc, and when I was out late with my camera, my Iphone proved to be really priceless: I could illuminate my Rolleiflex to set the speed and exposure in the dark, I could measure the light and I could work out my reciprocity correction, but I had to constantly fiddle switching between apps.
And a spontaneous and obvious thought has sprung up: why not combine the Reciprocity Timer with the lightmeter, possibly augmented by the incident light sensor and high sensitivity ( that part has been done already by Lumi, I think) ?
You could indicate the film, exposure correction, f stop and voila' you'd get a reciprocity adjusted time for f stops as high as 500...
What do you think of this?
And a spontaneous and obvious thought has sprung up: why not combine the Reciprocity Timer with the lightmeter, possibly augmented by the incident light sensor and high sensitivity ( that part has been done already by Lumi, I think) ?
You could indicate the film, exposure correction, f stop and voila' you'd get a reciprocity adjusted time for f stops as high as 500...
What do you think of this?
sevo
Fokutorendaburando
That is an idea that should really be suggested to the authors of the various light meter apps. The biggest problem would be to define reciprocity in a way that is easy to feed into the app - it would take hours with grid paper to translate the non-numerical curve drawings usually published by film manufacturers. Might a definition that merely gives the starting point and angle be good enough?
mfogiel
Veteran
There is already the Reciprocity Timer app which is quite well made, but it ain't a lightmeter.
sevo
Fokutorendaburando
It being on the Dark Side, unable to run on my Android devices, how does it work?
mfogiel
Veteran
You set the film type, the readout of your lightmeter's exposure time, possible exposure adjustment compensation ( in half stops), you can also dial in f length of the lens and bellows extension as well as a filter with it's factor, and the program reads out the modified time with a handy reading that becomes a count down timer which you can even trigger by voice... Quite smart app, I believe the author was consulting here before he made it.
sevo
Fokutorendaburando
How does it deal with different reciprocity characteristics? There is a whole world of a difference between Neopan 100 and the last remains of EPP in my fridge...
Or you could use Fuji. As I recall, both Acros 100 and Provia 100F have a 128 second exposure window before adjustments for reciprocity are a consideration. It's one of the few issues I have with the various Ilford black and white films. None of them are much good for unadjusted exposures over a second or two.
mfogiel
Veteran
There is a database of different film stocks inside the app.