On Sep 8, 2013, at 9:53 AM, Aahz Maruch <[email protected]> wrote: > The point is that m4/3 8mm is 16mm/e.
It provides a 180° field of view across the format diagonal, same as the corresponding full-frame fisheye for an APS-C camera. The reason for the difference in effective focal length is the difference in format proportions. >> Your comment sounds like it fits one of the categories in Ctein's most >> recent column on "The Online Photographer": >> http://theonlinephotographer.typepad.com/the_online_photographer/2013/09/bad-science-vs-good-science-a-guide-for-the-layperson-part-1.html >> >> Check out the "God of the Gaps" category. ;-) > > <shrug> Some people regularly claim that they want FF over APS-C due to > wide-angle versus crop-factor -- That's because most people saying that are using lenses and FoV notions derivative of 35mm cameras. They had a Pentax film camera, they have a 16mm lens, and they want the same field of view. That's the basis of the "Full-Frame" insanity. FourThirds format lenses were designed from the ground up for FourThirds format cameras. It is a complete system, with a different format proportion and sizing basis. The lens system covers the entire range of useful focal lengths and lens types from fisheye, ultra-wide rectilinear, up to 600mm telephoto. You don't have to know anything about "35mm equivalent field of view" or "crop factors" to use Micro-FourThirds and FourThirds equipment ... They are irrelevant to the system, which is not derivative of anything from 35mm film cameras. That's why I never mentioned "crop factor" to Marnie. It's simply not even remotely relevant unless you want to adapt a 35mm camera lens to a FourThirds format camera. G -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
