photography

[Andrew Mitchell]

Even in bright sunlight, if you stop a lens down to f22, or even to f32 (to
obtain maximum depth of field) the necessary exposure time will probably be
too great to freeze motion (and if you are not using a tripod then you may
have a little camera shake to complicate matters). The object of using a
flash is to give enough light to be able to reduce exposure time to 1/125
sec or less, and thus to freeze all motion.  Calculating correct
exposuresfor macrophotography is complicated, especially if you are using
teleconverters, diopters etc. That is why cameras with TTL (through the
lens) flash metering and high flash sync. speeds are recommended: you
simply set the flash sync. to 1/250 sec and shoot--the camera calculates
the corretc exposure and extinguishes the flash when it has enough light.
So, what shutter speeds were you using?

>We used a flash, but it is so sunny when the buterflies are out! It
>didn't work.

>----- Original Message -----
>From: Andrew Mitchell <am16 at ualberta.ca>
>To: <SUNSOL at prodigy.net>
>Cc: <>
>Sent: Monday, October 04, 1999 2:34 PM
>Subject: Re: photography
>
>
>> Try using a flash. Best to use a camera with TTL flash metering and 1/250
>> sec flash sync. speed--that'll freeze any motion and give the correct
>> exposure. For best results the flash should be held to the side of the
>> camera on a bracket. Many web sites have all the technical info. you'll
>> need. Try this one for starters:  http://www.sphoto.com/phototech.html
>>
>> Andrew
>>
>> >I'm trying to get some pictures (stills) of a butterfly laying eggs. The
>> >ones I took aren't so great. Anyone got any ideas how to take pictures of
>a
>> >fast moving butterfly?
>> >
>> >
>> >Sally

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Andrew Mitchell                        _____     \ /     _____
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