On 07/16/2014 10:51 AM, Erik Krause wrote:
Am 16.07.2014 22:00, schrieb David W. Jones:
Hmm, I've never seen autofocus change magnification on my Minolta 7D.
Magnification is a function of focal length; focus is not.
...and many modern lenses change focal length while focusing (rear or
inner element focusing). An extreme example is a 100mm Macro lens which
at 1:1 has a near focus distance of 30cm (measured from sensor to
object). Since least possible focus distance is 4 times the focal
length, the focal length must be at most 75mm at 1:1.
But magnification changes with object distance anyway, even in the thin
lens model. See wikipedia article: http://tinyurl.com/qhqspz
So changing focus while shooting a panorama is not a good idea.
Thanks. I've not noticed autofocus changing focal length on my lenses,
but I'd forgotten the one that has a Macro setting. When set on macro,
you focus by changing focal length.
I've taken to shooting my outdoor panos with a smaller aperture than my
usual f/3.2 - my short zoom lens is very sharp at 3.2, 5.6 and 6.3. Not
so good beyond 7.1.
So, Pawel, sorry for confusing the matter. I shoot handheld almost all
the time and don't particularly pay attention to nodal point, and my
simple panos come out reasonably.
--
David W. Jones
gnomeno...@gmail.com
wandering the landscape of god
http://dancingtreefrog.com
--
A list of frequently asked questions is available at:
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