The 180/2.0 takes regular 100mm filters on the front (only).
The 250/2.0 takes rear slip-in filters, but you can also mount a 128mm
frontal filter. Mine is a Heliopan.
The 350/2.8 looks identical, but that very same 128mm filter does not
go as far in as in the 250 thread. The 'thread' on the 350 seems to be
conical, or it is no thread at all...
Frank van Lindert
Utrecht NL.
On Thu, 7 Dec 2000 09:35:47 +0100, "Hans van Veluwen"
<hcvanveluwen@xxxxxxxxx> wrote:
>"any ideas how to mount a protective filter on a 300mm f2.8? Can a 122 be
>"dropped in"? I measured the lip at 127 but it won't take a threaded filter
>( Olympus Company)"
>
>
>Do you mean you contacted someone at Olympus and he told you the 350/2.8
>doesn't take any protective front filter? Then why is there something that
>looks like a filter thread? And why this 127mm - it corresponds exactly to
>the largest B&W filter size (SLIM line, available in UV only).
>Has anyone ever tried such a filter on one of the big three lenses?
>
>hnz
>
>
>
>
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