On Sep 23, 2005, at 12:35 PM, Adam Maas wrote:
E.R.N. Reed wrote:
But what I'm wondering is --
On the PZ-1 in Hyper Manual the IF button, and on the *istD in
Hyper Manual the green button, works like an exposure lock only
without the time limit imposed by actual "exposure lock" buttons.
Does the Ds not do this -- set the exposure and leave it set?
No, it does not. No Green Button, although the AE Lock approximates
this with K/M lenses in M mode.
Did you read my description of manual metering with the DS? I didn't
see it come through here.
[DS]
When you're working in Manual exposure mode, the AE-Lock press
forces an exposure reading based on what's in the meter's view at
that moment. There is no AE-Lock function, the settings just stay
where they are.
With all AF and A lenses, set to the A position on the aperture
ring, the only thing that changes as the meter's field of view
changes in Manual exposure is the EV readout in the bottom right
corner: telling you how far from the meter's last set exposure the
current view is. With older K/M lenses, nothing changes unless you
want to see changes by using the DoF Preview control, then you get
the EV readout.
In P, Tv, and Av modes, yes, the aperture/shutter settings will
jump around based on what the camera's pointed at because the
actual exposure value is not set until the time of exposure. The AE-
Lock button will fix a setting, illuminate the '*' symbol, and
allow shifting the setting manually by rolling the thumbwheel to
use other aperture/speed tuples ... but nothing jumps around.
Oh yes: The DS only operates the K/M lenses' diaphragm in Manual
exposure mode. In Av mode, they remain at fully open aperture. All
other AE modes default to Av mode.
Godfrey
