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  #1  
Old February 22nd 04, 05:46 PM
Malcolm Downes
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Default Difference

Hi all,
I have a Canon 500n plus a Canon 430ez flash gun, I would like
to know the difference between a 430 ez flash gun & the later EX type flash
gun, ie: what does the later model do that mine dos`ent? Thanks for your
help. MPD


  #2  
Old February 22nd 04, 08:47 PM
dslr
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Default Difference

Malcolm Downes wrote:

Hi all,
I have a Canon 500n plus a Canon 430ez flash gun, I would like
to know the difference between a 430 ez flash gun & the later EX type flash
gun, ie: what does the later model do that mine dos`ent? Thanks for your
help. MPD


The principle difference is that the EX series flashes do another type
of flash metering, E-TTL, which doesn't take a reading off the film
whilst the shutter is open. It makes a preflash to measure the light and
requirements before the main flash is fired whilst the shutter is open.

http://photonotes.org/articles/eos-flash/ may be a useful reference.

--
regards,
dslr
 




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