Velocity Reviews > Simple way of estimating shutter and focus lag

# Simple way of estimating shutter and focus lag

Bryn James
Guest
Posts: n/a

 12-07-2004
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

Owamanga
Guest
Posts: n/a

 12-07-2004
On Tue, 07 Dec 2004 13:10:13 GMT, Bryn James <(E-Mail Removed)>
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!

Ben Rum
Guest
Posts: n/a

 12-07-2004

"Bryn James" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> 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?

Mickey Dunston
Guest
Posts: n/a

 12-07-2004
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.

RustYŠ
Guest
Posts: n/a

 12-07-2004
"Ben Rum" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...

>
> 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/

secheese
Guest
Posts: n/a

 12-08-2004
On Tue, 07 Dec 2004 13:10:13 GMT, Bryn James <(E-Mail Removed)>
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.

Dave Busch
Guest
Posts: n/a

 12-08-2004
On Tue, 07 Dec 2004 13:10:13 GMT, Bryn James <(E-Mail Removed)>
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/colu...st/default.asp

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

Bob Harrington
Guest
Posts: n/a

 12-08-2004
Ben Rum wrote:
> "Bryn James" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>> 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...

secheese
Guest
Posts: n/a

 12-08-2004
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 <(E-Mail Removed)>
>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/colu...st/default.asp

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.

Larry
Guest
Posts: n/a

 12-08-2004
In article <(E-Mail Removed)>, http://www.velocityreviews.com/forums/(E-Mail Removed)
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 <(E-Mail Removed)>
> >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/colu...st/default.asp

>
> 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.