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[OM] Re: Mini Macro questions

Subject: [OM] Re: Mini Macro questions
From: Moose <olymoose@xxxxxxxxx>
Date: Fri, 16 Mar 2007 10:11:23 -0700
Dan Mitchell wrote:
> Moose wrote:
>   
>> First, I am not suggesting that you get a 90 mm lens. 
>>     
>
>   That said, this prompted me to retrieve the Viv S1 90/2.5 1:1 macro 
> off the shelf, and _wow_, is it ever a more pleasant experience taking 
> photos with that than with the reversed 7mm.
Your comments lead me to something I either didn't know or had 
forgotten. I wanted to make clear that I wasn't recommending  a 90 mm 
lens because I thought Scott might be thinking of a MF lens and I didn't 
think there was an AF one available. I figured it is fine if he makes 
that MF choice, but I don't ant to push it. I personally wouldn't want 
my primary lens for hiking through the woods to be MF, but others will 
have other ideas about that. The Tammy 90 Di is great, with the MF/AF 
switch in push/pull of the focus ring, but not available in 4/3 mount.

Now I realize that the Sigma 105/2.8 EX DG Macro is available in 4/3 
mount. I don't know anything about it except it has a 9.1 avg. rating 
from 52 userson the FM ratings forum, which is really good.

With a 4/3 field of view eq. of about 200 mm on full frame, it would 
have great working distance and is about $100 cheaper than the DZ 50/2. 
A stop slower means less bright finder, but not much.

It wouldn't "fill the frame" any better than 50/2 with EX-25, 1:1 is 
1:1, regardless of focal length, but it would do it from further away.

The thing I don't know about is DOF. My sense is that the trade-off for 
the working distance would be less DOF, but I can't do the juggling of 
different sensor sizes and focal lengths in my head.

Moose

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