On Apr 12, 2010, at 8:48 AM, Keith Whaley wrote:
Bong Manayon wrote:
Thinking of ...
1. Pentax DA 12-24
2. Sigma 10-20
3. Tamron 10-24
Am not into fish-eyes so those options are out. Any votes for or
against any of those listed above?
Thanks!
Bong
I don't think those focal lengths are 35mm-equivalent numbers. I
suspect they're double ~ such as the Pentax DA 12-24 is really like
a 35mm lens of 24-48mm focal length.
Nice wide angle-to-normal lens, but hardly a fish-eye...
First, the conversion factor for angle of view is 1.5. So the 12-24
has the same angle of view on an APS-C DSLR as an 18-36 would have on
a conventional 35 mm frame. However, the focal length is 12-24. That
doesn't change, regardless of the format. Furthermore, it's not a
fisheye on any format. It's a rectilinear lens. In other words, the
optics make the verticals as true as possible given the size of the
elements and the constraints of physical science.
Paul
keith whaley
--
PDML Pentax-Discuss Mail List
PDML@pdml.net
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above
and follow the directions.
--
PDML Pentax-Discuss Mail List
PDML@pdml.net
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and follow
the directions.
