On Tue, 8 Aug 2006 12:17:30 +0800, Gerrit 't Hart <> wrote:
>
> "Daniel Silevitch" <> wrote in message
> news:...
>> On Mon, 7 Aug 2006 11:40:04 +0800, Gerrit 't Hart <> wrote:
>> >
>> ><> wrote in message
>> > news: oups.com...
>> >> Hi I am looking at digital cameras and was wondering if the Sony
>> >> Cyber-shot H2 was worth getting. I am an aircraft enthusiast, wanting
>> >> pictures of them and would like to know if cameras of this type are
>> >> suitable. Also if the optical zoom is 12x, I have been told this is
>> >> equivelant to a 400 odd mm lens woul dthe quality still be as good, or
>> >> near to, as using a telephoto lens of said magnitude. Please help
>> >> becase I really dont know much about cameras.
>> >>
>> >
>> > If the aircraft are flying past at a rate of knots then you need a camera
>> > with little or no discernable shutter lag. Seems to me you would really
>> > need a DSLR.
>>
>> Yes and no. The superzooms aren't bad for that sort of thing if you
>> pre-focus them. I took this picture with an FZ5:
>> http://home.uchicago.edu/~dmsilev/Eagle.jpg
>> (Focal length was 396mm, a bit less than the camera max of 432mm)
>>
>> -dms
>
> Doesn't that do exactly what my mail was about?
> By prefocussing you reduce the time lag between pushing the go button and
> when the camera records the picture on the sensor.
> DSLRs are known to have the shorter time lag built in especially with manual
> focus (which btw is only available on a few superzooms)
Yes. My point was that even though the superzooms have non-trivial
shutter lag (like just about all non-DSLRs), you can get around that to
some extent by pre-focussing. Since most of the lag is focus lag, not
shutter lag per-se, in situations where pre-focus is feasible, it can
really cut down on the delay.
Pre-focus certainly isn't a cure-all, as there are many situations where
it won't work, but it's a useful technique to keep in the toolbox.
-dms