----- Original Message -----
From: "J. C. O'Connell"
Subject: RE: Camera engineering (This is signifigant)
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WILLIAM ROBB WRITES in post quote BELOW:
"I need to point out that AE is still available with K/M
lenses on Pentax digital cameras"
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NO ITS NOT. Green button thing is not AE by any stanards
of today or yesterday. Its metered manual. You have
to MANUALLY take a new meter reading every time you change the aperture
setting
which you don't have to do with AE and the camera does not continously
AUTOMATICALLY
adjust exposure for changes in subject or lighting either.
That what AE is. Continous AUTOMATIC exposure without
ANY need for operator intervention. When the operator
has to take new reading manually every time any of
these factors change its metered manual mode.
WHAT PART OF THIS DON'T YOU UNDERSTAND?
I guess I don't understand the part where I'm right, you are wrong, and you
are too stubborn to admit it.
It's the reason for why I keep replying.
Since you have never used a DSLR, Pentax or otherwise, let me explain what
apertue preferred automatic is, and how it is enabled on the istD (the
others I am not sure about, I haven't used them).
Aperture preferred automatic refers to an exposure function whereby the
camera operator sets the aperture, and the camera sets the shutter speed
based on a light meter reading.
On the istD, this is done thusly:
Set the aperture to the desired value.
Press the green button. The aperture momentarily stops down to the selected
aperture, and the camera sets the shutter speed, all by it's little self,
with no input from the operator.
Certainly not as seamless as on the fly AE, but since the camera is setting
the shutter speed itself, it is *not* manual exposure control by any
definition, other than your wrong one.
So your entire premise below is false because
you have overlooked the key MAJOR difference between metered
manual and AE and you are mistakenly calling metered
manual AE when it isnt. K/M lenses can and have been providing
true AE for 30 years, the green button thing is like
the old super-takumars of the 1960's. Stop down metered
manual. Not the same level of automation at all, and not
even close.
See above for explanation.
I've used stop down metered manual on old Spotmatics, and it is not the same
as the aperture preferred AE as implemented by the istD, which, if you had
ever used a Pentax DSLR, you would realize, rather than continuing to argue
out of ignorance.
John, I'm going to admit that you just don't get it , probably never will,
and bow out now.
Arguing with the ignorant is a fools game that I tire of quickly, and I
tired of this conversation yesterday afternoon.
William Robb
