The FA lenses also tell the body to what distance they are focused.
Perhaps his lenses are at infinity?
I had considered that too, but I'm not sure it follows.
I could see the camera opening up the aperture based on focus distance
relative to guide number, with a flash. But to adjust shutter speed?
Unless you're shooting slow-sync, then surely it assumes all light comes
from the Flash; and so shutter speed (up to x-sync) is irrelevant?
Nonetheless, I blame the sigma flash :)
- Peter
-----Original Message-----
From: Rick Womer
Sent: Friday, February 01, 2013 10:01 PM
To: Pentax-Discuss Mail List
Subject: Re: I don't understand
The FA lenses also tell the body to what distance they are focused. Perhaps
his lenses are at infinity?
Rick
http://photo.net/photos/RickW
----- Original Message -----
From: William Robb <[email protected]>
To: Pentax-Discuss Mail List <[email protected]>
Cc:
Sent: Thursday, January 31, 2013 6:51 PM
Subject: Re: I don't understand
----- Original Message ----- From: "Collin Brendemuehl" Subject: I don't
understand
When I put either the FA28/2.8or the FA50/1.4 and use either the
internal or a shoe-mount flash, the shutter speed goes to 1/25.
But when I use an "A" lens it goes to the desired 1/180.
Why?
The FA lens supplies more information to the camera and allows dynamic
shutter speed adjustment when using flash. A series and earlier don't supply
such niceties, and so the feature is disabled.
I suspect Pentax could enable it if they desired, the A lens does transmit
aperture, which is all that should be required, but they want to sell new
lenses, and so disable some features.
William Robb
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