Winsor Crosby wrote:
> Hoya makes a line of what they call "ultra thin" filters.
So does Heliopan and B+W
> The B & H
> catalog lists UV, skylight, and a UV+ circular polarizer in the
> "ultra thin" form. They are listed only in sizes 58 to 77mm however
> which does not help with most Oly applications.
3mm thickness for normal filters, 5mm for polarizer. They have no
front thread, bad, because one can not use the lens hoods.
Heliopan slim and Olympus filter do have front threads and are of the
same thickness (4mm).
All relevant sizes are available (Heliopan 43-95mm). Heliopan has a
much bigger variety of filter than Olympus. Olympus polarizer are only
available in 49mm and 55mm, but also have front threads, while
Heliopan slim polarizer (5mm thickness) miss this. No problem since
there is no screw in lens hood for 72mm thread and bigger lenses.
> They also list B&W slim wide angle filters in almost all sizes.
3mm thickness for normal filter and 5mm for the polarizer, from 49mm
to 127mm diameter, no front threads.
Happy new year
Richard
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