On 17 Feb 2005 at 14:47, John Chennavasin wrote:
>
> On Thursday, February 17, 2005, at 12:57PM, Bill Gillooly
> <[EMAIL PROTECTED]> wrote:
>
> >> But the EF-S 60mm f2.8 isn't wider than 50mm :-(
> >
> >I wasn't implying that the 60 is wider than the 50, it's wider than
> >the 100!
> >
> > 50mm x 1.6 = 80mm and
> > 60mm x 1.6 = 96mm
> >
> >Apparently the need for a 100mm equivalent is very important to this
> >market and 80mm doesn't cut it.
> >
> >Was there any word on price, maybe it's cheaper. Since this is an
> >EF-S lens, it is possible that it is specially corrected for the
> >needs of the APS-C sensor size.
>
> I'm still surprised that the Canon 60 macro is an EF-S lens,
> considering that Nikon has a 60/2.8 macro (although theirs is bigger
> and isn't internal focus). Would have been nice if it had 58mm filter
> to match the 100 macro USM.
>
> Someone will need to confirm this, but I suspect the effective focal
> length of the 60mm macro at 1:1 is shorter than the 50/2.5 macro due
> to the internal focus mechanism. This behavior is present on the
> 180/3.5 macro.
Same on the old 100/2.8 non-USM (and I assume on the later USM-
version too, optically identical, not?)
Btw, unless this 60mm has an even more complicated design than the
100/2.8 (not sure about 180/3.5), it might very well become a good
full-frame once you add an extension tube....that inherently
increases image diameter....
(the 100/2.8 mounted on a Novoflex bellows results in decent quality,
but also in very odd focus intervals....like 2 different lens-
helicoid focus points at some bellows extensions)
Anyway, those who want less focal length should shop for a secondhand
(or perhaps even today still factory-new??) Canon ('FD') 20/3.5 micro
lens, and invest some more in extension tubes & bellows (not
necessarily the expensive Novoflex toys....those can only be
justified if you want to maintain AE/AF control with EOS lenses,
otherwise an all-mechanical Russian or Pentax M42 bellows will
do....if you look hard enough you might even find one with tilt/shift
(like the rare HAMA/T2 bellows, with even more rare T2-reversal
adapters (to mount brand-lenses onto the T2-bellows)).
A complete list of all existing micro/RMS-mount lenses, with their
recommended magnification range:
http://www.a1.nl/phomepag/markerink/microlen.htm
--
Bye,
Willem-Jan Markerink
The desire to understand
is sometimes far less intelligent than
the inability to understand
<[EMAIL PROTECTED]>
[note: 'a-one' & 'en-el'!]
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