With rectilinear lenses doing format translations is easy. AOV is AOV,
but Fisheye lenses make hash those kinds of comparisons. I have a Pentax
17mm fisheye, and an old 12mm semi circular, (on film), fisheye made by
Sigma in the early 60's. I don't have any examples currently, (and
don't even have my film scanner attached to my current machine), but the
12mm on APS-C digital actually seemed to cover more than the 17mm did on
film even though the 12mm was 18mm/e. I'm pretty sure that comparing
fisheye lenses, AOV, by focal length is a fools errand.
On 9/8/2013 12:53 PM, Aahz Maruch wrote:
On Sun, Sep 08, 2013, Godfrey DiGiorgi wrote:
On Sep 7, 2013, at 9:43 PM, Aahz Maruch <[email protected]> wrote:
Sure, but there's nothing like the 8mm fisheye you can get for APS-C for
12mm/e. For most purposes, you're correct that's sufficient, but people
who really care about extreme wide-angle are likely to be less satisfied
with m4/3.
"For most purposes ..." Don't be ridiculous.
A fish-eye lens is a specialty lens, and the ONLY wide-angle lens
focal length not listed in native Micro-FourThirds mount. Perhaps
that's because there's a superb fish-eye lens in FourThirds SLR mount,
which work on mFT bodies with any of the four available, dedicated
Panasonic and Olympus FourThirds to Micro-FourThirds mount adapters
for 100% full function operation.
The point is that m4/3 8mm is 16mm/e.
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 -- given that Marnie didn't even know that
m4/3 has 2x crop factor compared with APS-C's 1.5x, I think it was
entirely reasonable to mention the wide-angle issue. I certainly don't
think it'll play a significant role in her decision given her telephoto
preference (or if it does, it'll have a reverse significance).
Side note: most of my shooting is also telephoto (except for macro), so
I'm definitely not grinding any axe favoring wide-angle and I consider
the m4/3 crop factor a plus myself because it makes for lighter and
smaller telephoto lenses.
--
A newspaper is a device for making the ignorant more ignorant, and the crazy,
crazier.
- H.L.Mencken
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