The B-300 screws on the front of the lens, so it may catch
more light than the lens would without it. If I remember the
B-300 is about 80mm in diameter ...
230/80 = 2.875
so it probably would work but you need to check the B-300
diameter.
-jeff
----- Original Message -----
From: "William Clark" <wclark@xxxxxxx>
To: "'Olympus List'" <olympus@xxxxxxxxxxxxxxx>
Sent: Monday, January 14, 2002 6:03 AM
Subject: [OM] B-300 on an Zuiko?
> 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
>
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