Simple way of estimating shutter and focus lag

Archived from groups: rec.photo.digital (More info?)

Bryn James wrote:

> I saw a nice demo on TV of how to estimate shutter and
> focus lag on a digital camera: put a paper arrow on a record
> turntable set to 33-1/3 rpm, and press the shutter button as the
> arrow passes a given point, then check where the arrow shows
> up on the digital picture. One revolution is 1.8 seconds, or 5ms
> per degree of rotation.

Or use an analog stopwatch.

Archived from groups: rec.photo.digital (More info?)

On Tue, 07 Dec 2004 13:10:13 GMT, Bryn James <fbjames@iee.org.uk>
wrote:

>I saw a nice demo on TV of how to estimate shutter and focus lag on a
>digital camera: put a paper arrow on a record turntable set to 33-1/3
>rpm, and press the shutter button as the arrow passes a given point,
>then check where the arrow shows up on the digital picture. One
>revolution is 1.8 seconds, or 5ms per degree of rotation.
>
>Not as accurate as the pros might need, but cheap and simple  

Nice one, but how can you tell it didn't go round three times?

....some of these digicams are *awfully slow*.

I'd actually like to do this test on my DV camera, I am sure it's near
a second and a half. But I don't know what a 'record turntable' is.

You'd need to repeat the test 3 or more times to see what influence
your own reaction time to trigger it has. Have 4 beers and repeat.

--
Owamanga!

Archived from groups: rec.photo.digital (More info?)

"Bryn James" <fbjames@iee.org.uk> wrote in message
news:tlabr09sh4lkf7mh1ln6qr68lce1vvm79u@4ax.com...
> I saw a nice demo on TV of how to estimate shutter and focus lag on a
> digital camera: put a paper arrow on a record turntable set to 33-1/3
> rpm, and press the shutter button as the arrow passes a given point,
> then check where the arrow shows up on the digital picture. One
> revolution is 1.8 seconds, or 5ms per degree of rotation.
>
> Not as accurate as the pros might need, but cheap and simple  


Digital camera & record turntable owners.. A bit of an oxymoron isn't it?
(Superstar DJ's excluded)

How do I do it with my MP3 player?

Archived from groups: rec.photo.digital (More info?)

"Ben Rum" <bundyrum75@yahoo.com> wrote in message
news:31lunnF3b8i6rU1@individual.net...

>
> How do I do it with my MP3 player?


Get a friend to drop it off a multi story block and take a picture of it.
Count how many floors down it has passed on the picture and do the maths.
If you get it slightly wrong it won't make any difference.
--
For Welsh Military Flying visit .......
www.groups.yahoo.com/group/V-A-S/

Archived from groups: rec.photo.digital (More info?)

On Tue, 07 Dec 2004 13:10:13 GMT, Bryn James <fbjames@iee.org.uk>
wrote:

>I saw a nice demo on TV of how to estimate shutter and focus lag on a
>digital camera: put a paper arrow on a record turntable set to 33-1/3
>rpm, and press the shutter button as the arrow passes a given point,
>then check where the arrow shows up on the digital picture. One
>revolution is 1.8 seconds, or 5ms per degree of rotation.
>
>Not as accurate as the pros might need, but cheap and simple  

Easier to just read the spec sheet or review data.

Archived from groups: rec.photo.digital (More info?)

Ben Rum wrote:
> "Bryn James" <fbjames@iee.org.uk> wrote in message
> news:tlabr09sh4lkf7mh1ln6qr68lce1vvm79u@4ax.com...
>> I saw a nice demo on TV of how to estimate shutter and focus lag on a
>> digital camera: put a paper arrow on a record turntable set to
>> 33-1/3 rpm, and press the shutter button as the arrow passes a given
>> point, then check where the arrow shows up on the digital picture.
>> One revolution is 1.8 seconds, or 5ms per degree of rotation.
>>
>> Not as accurate as the pros might need, but cheap and simple  
>
>
> Digital camera & record turntable owners.. A bit of an oxymoron isn't
> it? (Superstar DJ's excluded)
>
> How do I do it with my MP3 player?

MP3 will never be able to record the subtle nuance of an analog pickup
needle on a CCD...

Archived from groups: rec.photo.digital (More info?)

Ben Rum wrote:
> How do I do it with my MP3 player?
Tie the MP3 player to a ceiling fan? ;-)

- Siddhartha

Archived from groups: rec.photo.digital (More info?)

On Tue, 07 Dec 2004 13:10:13 GMT, Bryn James <fbjames@iee.org.uk>
wrote:

>I saw a nice demo on TV of how to estimate shutter and focus lag on a
>digital camera: put a paper arrow on a record turntable set to 33-1/3
>rpm, and press the shutter button as the arrow passes a given point,
>then check where the arrow shows up on the digital picture. One
>revolution is 1.8 seconds, or 5ms per degree of rotation.
>
>Not as accurate as the pros might need, but cheap and simple  

http://www.shooting-digital.com/columns/schwartz/shutte...


-------------------------------------
Everything I know, and then some:
http://www.auctionmyths.com

Archived from groups: rec.photo.digital (More info?)

On Wed, 08 Dec 2004 07:19:07 GMT, Dave Busch
<moc.seimmud4latigid@eriafresal> wrote:

>On Tue, 07 Dec 2004 13:10:13 GMT, Bryn James <fbjames@iee.org.uk>
>wrote:
>
>>I saw a nice demo on TV of how to estimate shutter and focus lag on a
>>digital camera: put a paper arrow on a record turntable set to 33-1/3
>>rpm, and press the shutter button as the arrow passes a given point,
>>then check where the arrow shows up on the digital picture. One
>>revolution is 1.8 seconds, or 5ms per degree of rotation.
>>
>>Not as accurate as the pros might need, but cheap and simple  
>
>http://www.shooting-digital.com/columns/schwartz/shutte...

And it can't compensate for the brain to finger delay. I got 0.2 and
1.0, but how much of that was my 44 yr old brain.

Archived from groups: rec.photo.digital (More info?)

In article <7modr0968f8k8kehqb33tgir5mlej0ritn@4ax.com>, sec@nbnet.nb.ca
says...
> On Wed, 08 Dec 2004 07:19:07 GMT, Dave Busch
> <moc.seimmud4latigid@eriafresal> wrote:
>
> >On Tue, 07 Dec 2004 13:10:13 GMT, Bryn James <fbjames@iee.org.uk>
> >wrote:
> >
> >>I saw a nice demo on TV of how to estimate shutter and focus lag on a
> >>digital camera: put a paper arrow on a record turntable set to 33-1/3
> >>rpm, and press the shutter button as the arrow passes a given point,
> >>then check where the arrow shows up on the digital picture. One
> >>revolution is 1.8 seconds, or 5ms per degree of rotation.
> >>
> >>Not as accurate as the pros might need, but cheap and simple  
> >
> >http://www.shooting-digital.com/columns/schwartz/shutte...
>
> And it can't compensate for the brain to finger delay. I got 0.2 and
> 1.0, but how much of that was my 44 yr old brain.
>
>

Probably a good deal less than the delay in my 59 YO brain/body.

It does seem though to be a good thumbnail measurement for a
photographer/camera combination.


--
Larry Lynch
Mystic, Ct.

Archived from groups: rec.photo.digital (More info?)

On Wed, 08 Dec 2004 07:19:07 GMT, Dave Busch
<moc.seimmud4latigid@eriafresal> wrote:

>http://www.shooting-digital.com/columns/schwartz/shutte...

Neat  

--

Bryn

Archived from groups: rec.photo.digital (More info?)

On Tue, 7 Dec 2004 14:59:26 -0000, "Ben Rum" <bundyrum75@yahoo.com>
wrote:

>
>"Bryn James" <fbjames@iee.org.uk> wrote in message
>news:tlabr09sh4lkf7mh1ln6qr68lce1vvm79u@4ax.com...
>> I saw a nice demo on TV of how to estimate shutter and focus lag on a
>> digital camera: put a paper arrow on a record turntable set to 33-1/3
>> rpm, and press the shutter button as the arrow passes a given point,
>> then check where the arrow shows up on the digital picture. One
>> revolution is 1.8 seconds, or 5ms per degree of rotation.
>>
>> Not as accurate as the pros might need, but cheap and simple  
>
>
>Digital camera & record turntable owners.. A bit of an oxymoron isn't it?
>(Superstar DJ's excluded)
>
>How do I do it with my MP3 player?
>
>
Simple, I used a ceiling fan with a mark on one of the four blades.
Set it for a suitable speed, count the number of full revolutions over
a precise time, then shoot the pic with that marked blade at the same
spot, and average the angular change. Convert that to time.

Olin McDaniel