Re: [OM] Ambient and Flash Ratio Tutorial
|Subject:||Re: [OM] Ambient and Flash Ratio Tutorial|
|From:||Winsor Crosby <wincros@xxxxxxxxxxxxx>|
|Date:||Thu, 14 Feb 2002 14:53:12 -0800|
> Excellent tutorial, but I do have one quibble:While focal plane synch limits the *fastest* shutter speed to 1/60, you can certainly use a slower shutter speed if you want to. At the extreme, that's how you combine a flash-exposed subject underneath a six-hour star trail exposure. So if you really want to stick with your slow film, you can do it with a slower shutter speed.What you are suggesting is true, but does reverse the sequence slightly. You are defining the aperture first and then the shutter speed last. Just like using a leaf-shutter camera--with a speed limitation of 1/60 instead of 1/500. Your example is a special case where you have defined your other four variables first. The fact that you have selected an illustration of very long time exposures means that the shutter speed limitation actually does not exist. The primary purpose of the tutorial was to work around the normal limitation of 1/60. Most of our cameras force flash sync at 1/60 when using auto modes. Ken-AG-Schnozz-N.
Absolutely superb explanation, Ken. I wish I had read something like it years ago.
I think the 1/60 second limitation is a good idea. Otherwise you might require the addition of a tripod to the mix.
-- Winsor Crosby Long Beach, California ? < This message was delivered via the Olympus Mailing List > < For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx > < Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
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