Ken Durling schrieb:
>
> OK, ignorant question here. The Canon 100, Sigma 105 and Tamron 90mm
> macro lenses are all favorably reported in terms of sharpness anyway
> by a number of individuals and chart reviews. Looking at their specs
> on B&H - which I realize is just advertising - I see that the newer
> Canon is listed as focusing much closer than the other two - all the
> way down to 5.9" as opposed to about 11-12" for the non-Canon lenses.
> Yet they are all graded as capable of 1:1 magnification. How can this
> be? Is the Canon actually capable of more?
>
AFAIK, this is a misunderstanding. The 5.9" are meant to be the
minimal distance from front element (=working distance at 1:1),
while the others are distances from film plane, like shown on
the distance scale. 5.9" from film plane would likely mean
"inside the lens".
Thomas Bantel
*
****
*******
***********************************************************
* For list instructions, including unsubscribe, see:
* http://www.a1.nl/phomepag/markerink/eos_list.htm
***********************************************************
