Assuming that the convertor has perfect light transmission capabilities, if
you double the focal length without doubling the physical aperture, my
arithmetic says that the maximum relative aperture must be halved (ie f/2.8
becomes f/4).
I don't know the B-300, but let's assume that it does have perfect
transmission - I doubt that it doubles the physical aperture!
Piers
-----Original Message-----
From: owner-olympus@xxxxxxxxxxxxxxx [mailto:owner-olympus@xxxxxxxxxxxxxxx]
On Behalf Of Clemente Colayco
Sent: Monday, March 31, 2003 8:25 AM
To: olympus@xxxxxxxxxxxxxxx
Subject: Re: [OM] My hunt for long, fast glass
Wait, as I recall list members discussed that the B 300 does lead to light
loss somehow.
----- Original Message -----
From: <petertje@xxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Monday, March 31, 2003 4:14 PM
Subject: [OM] My hunt for long, fast glass
>
> Hi,
>
> In the end I settled for an Olympus IS B-300 front convertor. I won a
> bid
for one at 142 Euro on eBay last week. Even though I've never used anything
like it, I liked the reviews it gets all over Internet. And a 150/f2.x
sounds cooooool :-)
>
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