An most-informative post -- thank you. However, so far in this discussion I
don't think anyone has mentioned what I thought was the reason that some
flash units are not recommended for use with NiCads, namely voltage. Using
my el-cheapo voltmeter, a new alkaline cell has an "open-circuit" voltage of
about 1.65 volts, compared to an open-circuit voltage of about 1.35 volts
for a fully-charged NiCad cell. Does this difference in voltage have no
effect? (I recognise that the on-load voltages may be different from the
open-circuit voltages quoted above.)
I am particularly interested in this, as I recently purchased a pre-loved
T18 flash via UK Ebay. I chose the rarer T18 in preference to the
more-common T20 because of the "upright stance" of the T18; this upright
stance results in the flash tube being further away from the lens than the
tube in the T20 (hence less likelihood of red-eye when the flash is used
on-camera). However, both the flash instruction sheet and the e-SIF say
that NiCads cannot be used in the T18. It sounds as though your suggestion
of a series resistor (0.25 ohms for the two-cell T18) might allow NiCads to
be used.
The T18 is functionally similar to the T20 -- both have energy-saving
circuitry and offer full TTL control with the relevant OM cameras. But the
T20 does have one advantage -- it has its own auto sensor for use with
non-OM cameras, or with OM cameras that do not have TTL flash control (the
T18 acts as a manual flash with those cameras).
-- from Cy in the UK
----- Original Message -----
From: HI100@xxxxxxx
To: olympus@xxxxxxxxxxxxxxx
Cc: williams@xxxxxxxxxx ; jowilcox@xxxxxxxxxxxxxxxxxxx
Sent: Tuesday, June 25, 2002 7:53 AM
Subject: [OM] flash recharging rate/Flash roulette
<text omitted>
Regards,
Tim Hughes
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