You have answered the question in the best manner ever. Many thanks.
Titoy
-----Original Message-----
From: John A. Lind <jlind@xxxxxxxxxxx>
To: olympus@xxxxxxxxxxxxxxx <olympus@xxxxxxxxxxxxxxx>
Date: Sunday, January 07, 2001 9:52 AM
Subject: Re: [OM] Will high-capacity batteries harm my flash?
>At 00:00 1/7/01, William Sommerwerck wrote:
>>Oh, yes... The F280's "cutoff" voltage is too close to 5V to work well
>>with NiCd cells. If you get ten flashes out of a charge, you're lucky. (I
>>haven't
>>tried it with NiMH cells, but I assume you'd have a similar problem.)
>
>I used two sets of NiMH cells in a pair of T-32's for the November wedding
>shoot . . . 300 shots, about 950f which were flash. I don't even know
>whether the first set would have made it completely through as I changed
>them out between wedding and reception. The reception consumed about 200
>shots, all flash. The flash recharge time was noticeably shorter than for
>alkalines and neither of the T-32's shows any worse for wear from it.
>
>Supposedly, the NiMH cells hold voltage until the bitter end. This is a
>boon, but also a problem in charging them, because it is hard to detect
>using voltage when they have fully charged. The more sophisticated
>chargers monitor several things while charging them to detect when to shut
>off. You might have better luck using NiMH in the F280.
>
>IMHO, the biggest risk to a T-32 (or T-20) is repeated full discharge
>firing on something like the BG-2 that has a very short flash recharge
>cycle, even though the BG-2 recharges the flash using high voltage through
>the 3-pin connector. If the flash is able to recharge fast enough, this
>can overheat the Xenon tube. Repeated means not just a few in rapid
>succession, but a bunch. Its hard for me to imagine a situation in which
>one would shoot enough frames fast enough to do this, even at a high rate
>of film burn like a wedding. I'm not certain if using the filters over the
>front of a T-32 will affect this. A higher level strobe discharge is
>required with a filter (or diffuser) over the front of the strobe, and
>logic tells me it would also inhibit heat dissipation to some degree. How
>much, and whether this is a real or imagined risk would require some
>testing to actually measure heat buildup.
>
>One of the advantages of using a more powerful flash setup is that you
>rarely have a full strobe discharge. Yes, it shortens recharge time, but
>it also does not generate as much heat per flash.
>
>What usually "kills" a T-20 or T-32 is dropping it on a hard surface (e.g.
>concrete, or asphaltic concrete), which can do in just about any piece of
>OM hardware. Bashing it on-camera and destroying its shoe can, but AFIK
>quite a few have been resurrected with a shoe replacement if nothing else
>is seriously damaged.
>
>-- John
>
>
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