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Re: [OM] B-300 on an Zuiko?

Subject: Re: [OM] B-300 on an Zuiko?
From: Jim Brokaw <jbrokaw@xxxxxxxxxxx>
Date: Tue, 15 Jan 2002 23:07:06 -0800
on 1/14/02 6:03 AM, William Clark at wclark@xxxxxxx wrote:

> Hey all,
> 
> I have been thinking of picking up a B-300.  Has a good reputation.
> I have a couple of questions though.
> 
> 1.  It seems that this 1.7x teleconverter will not increase a lens' f-stop.
> How is this possible?
> 
> 2.  If I put it on top of my 135 2.8, I will get a 230 2.8 (if 1 about is
> true).  What will be the performance of such a setup when compared to the
> 200 f4.  I thought this setup would be good for astrophotography.
> 
> Thanks!!!
> -Bill
> 

This will fit and work, but it seems to meter about 1/2 stop slower than
2.8... still pretty good for the focal length. FWIW, it also fits the
100/2.0 and yields about a 170/2.5 (I think). B-300 thread diameter is 55mm.
so it would also fit the 200/4.0, I suppose you'd get about a 340/5.6 then.
Might as well use the 300/4.5 instead. Meter readings with one of my OM-4's
so probably within about 1/3 stop...
-- 

Jim Brokaw
OM-1's, -2's, -4's, (no -3's yet) and no OM-oney... 


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