App for f-stop time calculations (iOS)

[radiant]

Released new iOS app for f-stop time calculations, available free here:

https://apps.apple.com/fi/app/fstop-calc/id1488658790?l=fi

Please try & review

 

[RalphLambrecht]

Released new iOS app for f-stop time calculations, available free here:

https://apps.apple.com/fi/app/fstop-calc/id1488658790?l=fi

View attachment 235011

Please try & review

good idea but why not just read it off table?

 

[radiant]

good idea but why not just read it off table?

Feel free to use a table if you want

 

[markbau]

good idea but why not just read it off table?

Ralph, I'm curious as to why your base exposure times are such odd numbers. I've been using the Nocon numbers for many years in which the progression is simply, 2.5, 5, 10, 20 40 seconds with his numbers in between, (see attached pic)

 

[radiant]

Ralph, I'm curious as to why your base exposure times are such odd numbers. I've been using the Nocon numbers for many years in which the progression is simply, 2.5, 5, 10, 20 40 seconds with his numbers in between, (see attached pic)
View attachment 235018

Ralph's table is a real f-stop table with all step times in accurate form.

markbau your table seems to be roughly rounded numbers when base f-stop of 1.4 and then increased with 1 stop (in f-stop system the times are 2.6s, 5.3s, 10.6s, 21.1s).

 

[markbau]

Ralph's table is a real f-stop table with all step times in accurate form.

markbau your table seems to be roughly rounded numbers when base f-stop of 1.4 and then increased with 1 stop (in f-stop system the times are 2.6s, 5.3s, 10.6s, 21.1s).

I don't know about "roughly rounded numbers" If you agree that 10 sec is a one stop increase from 5 seconds, and 20 seconds is a one stop increase from 10 seconds I don't see the need to have base exposures that are not whole numbers. A half stop increase from 10 seconds is 14.1, a full stop is 20 seconds. BTW, Rudmans f stop calculation table is identical to Nocon's. 5, 10, 20 seconds are full stops. I still don't understand why base exposures need to be anything but whole numbers. Rudman's base exposures are all whole numbers. What am I missing here?

 

[RalphLambrecht]

Ralph, I'm curious as to why your base exposure times are such odd numbers. I've been using the Nocon numbers for many years in which the progression is simply, 2.5, 5, 10, 20 40 seconds with his numbers in between, (see attached pic)
View attachment 235018

the numbers in my table follow a geometric scale based on 8 or 16 seconds. They are no more 'odd' than the aperture or timing labels on your cameras or lenses.

 

[RalphLambrecht]

Feel free to use a table if you want

just find it simpler to have the overview of a table; too many electronic toys in my life as it is.

 

[ced]

Some may be interested in this, if so contact the author for a script into Excel etc.
https://www.facebook.com/photo.php?fbid=124623375511125&set=gm.10156634699077749&type=3&theater

Some other link to his FB.
https://www.facebook.com/gerard.sme...Np8CpbVBG3QB8BHdaQDBfMdnj6AU7Kd0-mq&tn-str=*F

 

[radiant]

The "secret" formula is just a power of 2 to f-stop -> in math 2(f-stop).

If you need to calculate time to f-stops, just calculate log2 value of your time and you get f-stops.

 

[radiant]

I have downloaded the app but I have no idea what it does. Can anybody explain me what is going on?. What does this app do?. The interference looks nice but I want to know what function it does. It is not a calculator that is what I know from using it.

It is an app to help you with f-stop time calculations. It "converts" f-stops into seconds and you can see the added f-stops in terms of time sum and the incremental amount between stops.

F-stop calculation is mostly used in darkroom printing.