[OM] B-300 on an Zuiko?

[William Clark]

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