On Sep 8, 2013, at 10:39 AM, Aahz Maruch <[email protected]> wrote:

> Unless I'm missing something, there is no currently-available 600mm lens
> for either 4/3 or m4/3, so right there you're talking about crop factor
> (given the 300mm lenses available).  It would seem that you're making my
> argument for me.  ;-)
> 

I was referring to the equivalent FoVs ... 14mm EFoV to 600mm EFoV ... for YOUR 
sake as I assume you are not familiar with FourThirds FoVs. 
The focal lengths are 7mm to 300mm. A normal lens is 25mm. 

> Given that, I think the crop factor issue is particularly important when
> you're comparing cameras with different sensors and trying to evaluate
> lens availability.  I mean, you need to know that for m4/3 you want a
> 45mm lens for a "standard portrait" lens.

Granted, but that's one of the things that make FourThirds particularly apropos 
for Marnie's aim. A fast 45mm lens is a smaller and lighter than a 90mm lens. 
One of my favorite combinations with the E-1 is a Nikkor 85mm f/1.8 or Leica-R 
90mm f/2 to net a 170-180mm EFoV with a fast aperture. My old Nikon film setup 
for that was a 180mm f/2.8 lens. The combination of E-1 + Summicron-R 90/2 is 
half the size and two-thirds the weight of the Nikon F3 + 180/2.8. 

A favored 70-200mm EFoV zoom lens in FourThirds is something like a 35-100mm 
lens. 

G


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