From: John Francis
On Fri, May 25, 2012 at 02:30:57PM -0400, John Sessoms wrote:
From: Darren Addy
I'm curious... if it shows up in Photoshop as a Pentax-F 35-105mm,
does that mean that it is also misreading the focal length that this
lens is set at (when doing image stabilization)?
If it is doing image stabilization for a 105mm focal length when the
lens is set to 200mm, that could definitely lead to some lack of
sharpness. I think I will see if I get better results with Image
Stabilization off and tripod mount it (which I guess I should be doing
to test for sharpness anyway!).
I don't know.
I think the camera just has to have some kind of a code to bury in
the EXIF to identify the lens & it uses the code that PhotoShop
thinks is the Pentax-F 35-105.
Don't blame the camera - it just reports the code it gets from the lens.
Some manufacturers (most notably Sigma) didn't request a code from Pentax
(presumably because there was a cost involved), so just used the same code
for multiple lenses (usually one that corresponded to a Pentax lens that
was similar to the first lens). I'm a little surprised to see that Tokina
did this - they used to be a Pentax partner, so I'd expect them to get it
right).
As for the original query: it should be pretty easy to confirm that the
reported focal length is correct - that information is also in the EXIF.
When I mount this on my K20D, it shows the correct focal length in the
image information when I review images on the LCD.
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