Camera Riddle: "How long would it take to ..." - General Chat - CHDK Forum

# Camera Riddle: "How long would it take to ..."

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#### Barney Fife

• 1157
##### Camera Riddle: "How long would it take to ..."
« on: 20 / February / 2008, 22:05:19 »
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« Last Edit: 22 / April / 2008, 12:35:49 by Barney Fife »
[acseven/admin commented out: please refrain from more direct offensive language to any user. FW complaints to me] I felt it imperative to withdraw my TOTAL participation. Nobody has my permission, nor the right, to reinstate MY posts. Make-do with my quoted text in others' replies only. Bye

#### barberofcivil

• 268
##### Re: Camera Riddle: "How long would it take to ..."
« Reply #1 on: 21 / February / 2008, 16:04:39 »
I posted this as a comment on another thread, and thought it might make for a fun (if short) discussion.

Interestingly, the S3, when going from an exposure of 65", f/2.7, & ISO1000 up to its available (and tested) 1/40,000, f/11, ISO50, gives a full range of 30.6 EV steps in exposure, if all bracketing features were implemented (Av, Tv, + ISO). Resulting in a grand total 92 bracketed images of 1/3 EV increments. No, I've not done this all combined, just do to it. I only know that much range is available if I ever wanted to take advantage of them in a high-speed bracketing script that would engage Av, Tv, and ISO changes at the appropriate moments.

Math Riddle: How long would it take for a camera to take all 92 of those exposures if it can shoot at 2.4 fps?  The answer isn't as easy as you might first think.

I only get 90 bracketed images:
Tv 65" - 1/40,000 = 65
Av 2.7 - 11 = 13
ISO 1000 - 50 = 14
this adds up to 92, however there is an overlap of 1 image for each grouping: 92 - 2 = 90.

That said, we can assume any shutter speed over 2.4s will take as long the shutter speed, any under that will take 2.4s, we should also assume that the Av and ISO bracketing images would be taken at the faster end of the shutter speeds (or at least at shutter speeds under 2.4s) to minimize the amount of time it takes.
Summing this up, I get 480.53s or about 1/2 second over 8 minutes.

*Note I am using 2^ EV values to calculate this rather than rounded values, in this scenario, the longest shutter is 64" (then 50.80, 40.32, 32.00, etc.)

-tgq

#### barberofcivil

• 268
##### Re: Camera Riddle: "How long would it take to ..."
« Reply #2 on: 21 / February / 2008, 16:11:53 »
I posted this as a comment on another thread, and thought it might make for a fun (if short) discussion.

Interestingly, the S3, when going from an exposure of 65", f/2.7, & ISO1000 up to its available (and tested) 1/40,000, f/11, ISO50, gives a full range of 30.6 EV steps in exposure, if all bracketing features were implemented (Av, Tv, + ISO). Resulting in a grand total 92 bracketed images of 1/3 EV increments. No, I've not done this all combined, just do to it. I only know that much range is available if I ever wanted to take advantage of them in a high-speed bracketing script that would engage Av, Tv, and ISO changes at the appropriate moments.

Math Riddle: How long would it take for a camera to take all 92 of those exposures if it can shoot at 2.4 fps?  The answer isn't as easy as you might first think.

I only get 90 bracketed images:
Tv 65" - 1/40,000 = 65
Av 2.7 - 11 = 13
ISO 1000 - 50 = 14
this adds up to 92, however there is an overlap of 1 image for each grouping: 92 - 2 = 90.

That said, we can assume any shutter speed over 2.4s will take as long the shutter speed, any under that will take 2.4s, we should also assume that the Av and ISO bracketing images would be taken at the faster end of the shutter speeds (or at least at shutter speeds under 2.4s) to minimize the amount of time it takes.
Summing this up, I get 480.53s or about 1/2 second over 8 minutes.

*Note I am using 2^ EV values to calculate this rather than rounded values, in this scenario, the longest shutter is 64" (then 50.80, 40.32, 32.00, etc.)

-tgq

Oops, 2.4 fps, not 2.4s, therefore replace 2.4s above with 1/2.4=0.42s

This gives a time of 336.64s or 5min 36.6s.

-tgq

#### Barney Fife

• 1157
##### Re: Camera Riddle: "How long would it take to ..."
« Reply #3 on: 21 / February / 2008, 20:26:51 »
Deleted
« Last Edit: 22 / April / 2008, 12:36:10 by Barney Fife »
[acseven/admin commented out: please refrain from more direct offensive language to any user. FW complaints to me] I felt it imperative to withdraw my TOTAL participation. Nobody has my permission, nor the right, to reinstate MY posts. Make-do with my quoted text in others' replies only. Bye