You have something special at hand! No serious, this filter was only offered
by Asahi Pentax (AFAIK). It avoids inner reflections in the lens compared to
using a flat filter. It is most effective with short focal lengths. It has
no magnifying power at all and can be used in any case where you would use a
regular skylight filter.
Take care,
Wim van Heugten
----- Oorspronkelijk bericht -----
Van: ToddEStan <[EMAIL PROTECTED]>
Aan: <[EMAIL PROTECTED]>
Verzonden: zaterdag 6 januari 2001 22:50
Onderwerp: Strange Pentax Skylight Filter
>
> I just recieved a new lens from eBay, a SMC-M 135mm F3.5, and attached to
> it is a "ASAHI PENTAX 49Ø SKYLIGHT GHOSTLESS JAPAN". Something didn't
look
> right with the filter, so I screwed it off and examined it a bit closer.
> It seems that the filter is curved. The outside part is convex and the
> inside part is concave! I have never seen anything like this before.
> Looking through the filter it seems to be a weak magnifier. Does anyone
> know if the filter is supposed to be like this? I would think it would
> have an effect. Is this some kind of special protective filter just for
> the SMC-M 135mm F3.5 lens?
>
> Thanks!
> Todd
>
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>
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