At a guess, it's because there isn't enough light coming through the lens to
permit Autofocus (or you to Focus for that matter).
You remind me of my first SLR (pre-OM1) which did not have auto diaphragm.
I was proposing to take some flash photos (bulb flash, pre-electronic flash
even) but found that I needed to set the lens at something like f/8. Forhet
about focusing - I could not *see* anything in the viewfinder, as if I had
locked the mirror up!
Piers
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
Of Walt Wayman
Sent: 03 September 2004 16:37
To: olympus@xxxxxxxxxx
Subject: [OM] Re: OM77AF - To buy or not to buy?
--snip
One thing that puzzles me, although it is, particularly now, of no
importance and just a matter of curiosity, is that in Shipman's book, it
says certain lenses cannot be used with the OM77, among other Oly bits. The
lenses he lists are the 500/8 reflex, 600/5.6, and 1000/11. I can
understand that the camera may lack the oomph to operate the diaphragm in
the 600 and 1000, but what's the problemm with the 500/8, which has no
diaphragm? Idle minds want to know.
Walt
--
"Anything more than 500 yards from
the car just isn't photogenic." --
Edward Weston
--snip
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