Here's my take...
Jan Steinman <Jan@xxxxxxxxxxxxxx> wrote:
> Nearly all digital cameras fire a pre-flash that is not associated with
red-eye reduction. It is used to set white balance and exposure. You may be
able to turn it off by shooting in full manual mode, but probably not. If
there is a hot-shoe, you may be able to slap a low-powered manual flash on
there to trigger the slave.
I agree totally with Jan's statement(s) on the pre-flash. The Canon A20
doesn't have a hot shoe, so that won't work.
> There are expensive slaves that will count and discard pre-flashes, and I've
seen circuits of simple R-C delay filters to go between your slave and your
pack. (Of course that doesn't help if you are using something with a built-in
slave.
Whether or not these slaves are 'expensive' depends on your definition of
expensive. If I remember the original email, you were using the HP 315 (and
now trying to use the Canon A20) to fire your monolights, right?
If so, you've already invested a fair amount of $$$ in the studio lighting, so
maybe you should consider the "Wein HS Hot Shoe Slave (150' Range) - for
Digital Camera Systems" -- it's about $70 from B&H, it was designed to handle
the pre-flash of digicams, and it has a side mounted PC terminal that you
could use to trigger the monolights.
Here's a URL for this product at B&H:
http://www.bhphotovideo.com/bh2.sph/FrameWork.class?FNC=ProductActivator__Aproductlist_html___263024___WEHSD___REG___CatID=1736___SID=F3B0E13F930
> The quick answer is, "You're screwed." In general, digicam flashes don't
work with slaves.
I'd disagree here. I haven't personally used the Wein, but given the almost
constant introduction of new digital-related products and accessories that
photographers can get to integrate their digicams with their existing
equipment, it'd be worth calling B&H or posting a message on the forums at
http://www.dpreview.com or http://www.photo.net to hear what other people have
done with this challenge.
Regards and good luck,
- Craig
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