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Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!

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Offline Kalli

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  • A620, SX10 IS
Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #40 on: 02 / December / 2007, 10:35:18 »
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(Gimme a break, I'll be 53 soon. That brain ain't what it used to be. ;D)
[/quote]
...so you are a youngster ;D I turned 58 in april, beeing part of an early retirement program :D

Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #41 on: 02 / December / 2007, 10:56:31 »
Hmmmm... sorry if I messed up on my first post.  Anyhow, here is an S2 IS image of a Dremel tool spinning at 30000 rpm. Calculated exposure was 1/8000 (with SYNCHED flash!) f3.5 and ISO 400. Amazing!  Many, many thanks to the developers who created this wonderful tool!

dd


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Offline GrAnd

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Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #42 on: 02 / December / 2007, 11:31:03 »
So, 30000 rpm means 500 rps (revolutions per second). For 1/8000 it should be 1/16 of circle filled. But the picture is much sharper.
CHDK Developer.

Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #43 on: 02 / December / 2007, 12:48:12 »
Right, it doesn't compute.  The tool is rated at 30000rpm and was on the highest speed setting. Assuming the rpm is approximately correct does that imply an effective (flash and/or shutter) exposure of about 1/50,000th second?


Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #44 on: 02 / December / 2007, 12:57:29 »
So, 30000 rpm means 500 rps (revolutions per second). For 1/8000 it should be 1/16 of circle filled. But the picture is much sharper.

Therefore, according to Barney Fife's comment, the flash light takes much shorter time than 1/8000s.
As proposed before in this thread, you should use very bright light instead of flash.

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Offline n6mod

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Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #45 on: 03 / December / 2007, 02:19:36 »
Well, it's not calibrated, but if you got an image (not using flash) at 1/1000, that should be a half-turn at 30k rpm. Using that as a reference (as 1/1000 is a 'supported' shutter speed), you should be able to calculate what the overridden speeds actually achieve.

That's what I was intending to do, and will test tomorrow night.

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Offline a710is

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  • A710 IS
Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #46 on: 03 / December / 2007, 02:27:23 »
a picture of that spinning disk taken at a standard speed should have been taken like 1/2000 so you can tell the new speed compared to that, not compared to the theoretical speed of the dremel. I would assume that the camera's timing is more accurate than the dremel's speed rating.

Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #47 on: 03 / December / 2007, 17:05:04 »
hello  :) I am using CHDK version pre14.grand148.md.cln.zsm-a630-100c-124 on my A630, and in the raw menu are 5 (the first 5) menu options that don't have labels.  what are the labels supposed to be?


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Offline Kalli

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  • A620, SX10 IS
Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #48 on: 03 / December / 2007, 17:22:33 »
Hi
I fooled around with fingalo's build 128. It looks like the A620 is capable to shutter speeds up to between 1/32100 and 1/40500.

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Offline a710is

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Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #49 on: 03 / December / 2007, 17:54:17 »
how do I get lower times than (the relative) 1/10000? what's the script? cause I believe my camera can do even lower than that.

 

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