Inquiring minds want to know. I know the mirror will lock up (I think
below 2.2 volts) and the shot will not be taken but your view of how
this works doesn't make sense to me. We know that even the first
shutter curtain is not actutated or we'd have an exposure and ruin the
frame. So, how can the camera measure the load on the curtain magnets
without acutating at least the first curtain? Is there maybe a latch
that gets set on the prior exposure that says lock up on the next one?
ps: The 2.2 volt number is key to why alkalines don't work well for
these cameras. It doesn't take long for a pair of alkalines to fall
that low even though they may be able to deliver a fair amount of
current. As you said, stick with silver oxide!
Chuck Norcutt
Moose wrote:
> The 2 and later bodies intentionally are
> designed to lock up if the voltage drops too low to assure correct
> exposure. If it locks up, you KNOW the shot wasn't caught, rather than
> getting a nasty surprise later. So under the trivial load of the test
> circuit, the red light is fine, but under the much higher load of the
> shutter curtain electro-magnets, the voltage drops and the camera locks
> up until released.
>
> So, they will often tend to work fine for the occasional short exposure
> shot, but lock up with longer exposures or the second or third exposure
> in rapid succession.
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