If the glasses has good coverage (no vignetting) and assume no "glass
and reflection lost" there will be no light loss for front adapter. As
in the case of B300 on IS3000 and T-Con 14B on E-10 the lost is
neglectable, for sure not one stop.
C.H.Ling
Piers Hemy wrote:
>
> 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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