Re: Potential shutter speed problems

[P3D Gabriel Jacob <jacob@xxxxxxxxxxxxxx>]

I wrote
>> I notice this when I shoot pictures with my twin P&S, but surprisingly
>> the scan lines are only an inch or two displaced from each other most
>> of the time.

Marcus replies
>doen't sound too suprising , or am I missing the point ? Since each scan 
>(field) is 1/60 (for you NTSC guys, 1/50th for us PAL guys) of a second i.e. 
>the two interlaced fields take 1/30th to display = 30 frames a second. Then 
>regardless of the point at which you fire the shutters they can only ever by a 
>maxium of 1/60th of a second apart in terms of the relative postition of the 
>scan line.

Yes, the maximum the relative position of the scan lines can only be 1/60th
of a second unless of course you go to the next field. Regardless of this,
1/60 of a second (or 16.6ms) is a very small unit. When I take a pic and
the television screen happens to be in the background, I notice that there
is about only a few inches apart (most of the time, same frame). This
translates to the shutters firing within aproximently 2ms!

Gabriel


------------------------------