: Kind of related question... I have the IS/L B-300, and I thought, OK I'll
: put this on the 100/2.0 and have a 170/2.0. I had a couple of shots left
on
: a roll, so I mounted up the 100/2.0 and took a picture... the indicated
: exposure (OM-2s on auto) was ~1/250 at f8. Then I screwed on the IS/L and
: took another shot, within 15 seconds, of the same scene, and got the
: expected 170mm narrower viewpoint. But the indicated exposure at f8 was
: about a segment above 1/125... Which would approximately correspond to the
: light lost with a 1.7X converter.
:
: My question: What is is about the IS/L converter that makes it 'faster'
than
: a 1.7X teleconverter put behind the lens?
At the most you loose 1/3 of a stop with the iS/L converter; this
corresponds with these OM-3/4 readings which are accurate to 1/3 stop.
Converters put behind the lens (available from Olympus as 1.4x and 2x) put
extra extension in between which causes 1 resp. 2 stops loss.
hnz
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