On 11/29/2012 01:42 PM, Greg 'groggy' Lehey wrote:
Did you read the article? It specifies numerous different
projections. And the difference between 140° and 180° can't be
attributed just to distortion.
Indeed:
"The angle of view of a fisheye lens is usually between 100 and 180 degrees[
1] <http://en.wikipedia.org/wiki/Fisheye_lens#cite_note-bare_url_a-1> while
the focal lengths <http://en.wikipedia.org/wiki/Focal_length> depend
on the film
format <http://en.wikipedia.org/wiki/Film_format> they are designed for."
That wasn't what I was referring to, but arguably it needs to be
improved. The reference is barely authoritative, and "Film format"
sounds positively archaic.
To me, "film format" for digital cameras refers to the proportions of
the CCD. My Minolta has an APS-C sized CCD. Other cameras have CCDs with
the same proportions and size as a frame of 35mm film. So the phrase
doesn't sound archaic to me.
I use several lenses designed for my old 35mm film camera (Minolta Maxum
5), and one designed for Minolta's APS-C sized CCD. The lenses for 35mm
film all have a ~1.5 focal length multiplier when used on APS-C-sized
film or sensor. So my 500mm tele lens has the field of view of a 750mm
tele on my Minolta 7D - which is narrower.
So the sensor size a lens was designed for impacts the field of view you
get from it.
Or so I think, this late at night ... I have no fisheye lens around,
preferring to stitch lots of full-resolution images together to make a
big panorama, vs using a lens to squeeze a wider image into the same
limited number of pixels.
Some day would like to buy a Sony A-950 (compatible with my lenses) and
using a 36mpixel 35mm full-frame sensor. I like details! :-)
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