Actually, Andrew, Chuck is correct in this. It's not a crop factor
he's talking about, but light-loss due to extension.
AG
On Wed, Dec 15, 2010 at 3:23 PM, Andrew Fildes <afildes@xxxxxxxxxxxxx> wrote:
> I thought we'd dealt with that one recently.
> The view is smaller, not dimmer.
> An aperture is an aperture is an aperture.
> The sensor size does not affect it.
> If I put my Zeiss 180mm f2.8 medium format lens on 35mm, it does not become
> an f2.
> I can put it on my E-P2 and have done for fun. Does it become an f.1.4? No.
> My Voigt. 25mm f0.95 is still that aperture on mFT.
> It's DOF that is affected.
>
> Andrew Fildes
> afildes@xxxxxxxxxxxxx
>
>
>
> On 16/12/2010, at 12:31 AM, Chuck Norcutt wrote:
>
>> But the reason for an f/2 macro lens is not for you to shoot at f/2.
>> It's so you can still focus at an effective f/3 instead of f/5.3 when
>> you're at half life-size. That said, I only have the f/3.5 version.
>> f/2 is too expensive. :-)
>
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--
Ken Norton
ken@xxxxxxxxxxx
http://www.zone-10.com
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