My Sigma is the older 170-500 (not so sharp at the long end) & I have found
that f9.5 is needed for acceptable sharpness. I started with the Jack Davis
formula: TAv, 1/2000, f8 but soon changed to f9.5. The K7 is ISO challenged
being noisy above ISO 800 but, from the K5 onwards, even ISO 6400 should be
OK. With the K7 in poor light I drop the shutter speed & hope for the best.
As Paul says, exposure compensation in camera or post-processing amounts to
the same thing. I agree that photographing distant subjects (which they
mostly seem to be!) is counterproductive but still useful for
identification.
Alan C
-----Original Message-----
From: Paul Stenquist
Sent: Thursday, April 06, 2017 5:37 PM
To: Pentax-Discuss Mail List
Subject: Re: I think I might have photographed an eagle or two
f6.3 should be fine for small birds at a considerable distance where you’re
cropping down to about half of the full frame. But for bigger birds,
particularly those facing camera, I would go to f8. If you focus on the eye,
some softness elsewhere is tolerable.
On Apr 6, 2017, at 11:33 AM, Darren Addy <[email protected]> wrote:
On Thu, Apr 6, 2017 at 10:12 AM, Paul Stenquist <[email protected]>
wrote:
With the Sigma long lens I would shoot at f5.6 or f8 at 1/500th
The Bigma has a maximum aperture of f/6.3 at 500mm (and, of course,
the DOF is thin).
Darren Addy
Kearney, Nebraska
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“The Earth is Art, The Photographer is only a Witness ”
― Yann Arthus-Bertrand, Earth from Above
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