Peter -- I've not seen vignetting with the B-300 on my IS-3. However, I
think it needs to be used only at the extreme extension 180mm focal length
setting of the zoom, and I also don't believe that putting filters in
between the zoom and the B-300 is a good idea.
I'm not sure what you mean by "bayonet" -- my IS-3 has only filter threads
on the end of the zoom lens. It feels to me like the B-300 is 'heavy' for
the weight of the B-300, but this is how Olympus designed it... I think
adding a filter in between zoom and B-300 might be a possible cause of the
vignetting, especially if the filter were deep (as a polarizing filter often
is).
I would try it with and without, and see if that filter contributes to the
vignetting.
--
Jim Brokaw
OM-'s of all sorts, and no OM-oney...
Peter wrote:
>
> Hi,
>
> I just got back from my trip to Ireland. I tested the B-300 front convertor,
> but I still need to study my slides. Vignetting is definitely quite
> noticable, which is a shame. Second, I don't particularly like the fact that
> I need to screw it into the filter thread every time I want a bit longer lens.
> The filter thread is clearly not made for this purpose, whereas the bayonet
> is.
>
> I found the fact that there's no filter thread in the B-300 itself, to be no
> problem: the filters can be fitted between the B-300 and the main lens. But
> it doesn't feel very safe to have a lot of glass hanging off a polarizing
> filter.
>
> Interesting experience all in all !
>
>
> Peter.
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