: Have I got this right?
: Will the B-300 1.7x converter for the iS/L series work on my OM lenses
: giving me, for example, a 230/2.8 if fitted to the 135/2.8,
Yes.
: or a 110-340/4 fitted to a 65-200/4
Yes, but the low end (< 80mm) will have too much vignetting.
: or a 85/1.4 fitted with a 55-49 step down ring on a 50/1.4.
No, this will give serious tunnel-like vignetting.
: With no loss of speed and marginal effect on image quality?
Yes.
: How can this be!?
It's a kind of magic.
: If so, I've got to get one.....
Yes.
hnz
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