<[EMAIL PROTECTED]> wrote:
To: <[EMAIL PROTECTED]>
Sent: Monday, January 29, 2001 8:47 PM
Subject: Re: Polarizers on ultra-wde angle lenses Wa suggestion
ultra-wide angle lens
> In a message dated 1/29/01 10:33:36 PM Eastern Standard Time,
> [EMAIL PROTECTED] writes:
>
> << The other issue is use of filters. Pentax comes with built-in
yellow,
> orange, skylight, and UV. Tamron and Sigma has a slot for gelatin
filters.
> The Ultra-wide Heliar (12mm) has an optional 77mm filter adapter.
In
> practical terms that means
> that only Ultra-wide Heliar will allow you to use a polarizer
(but it's
> still a pain). >>
>
> Someone makes a "wide angle" Polarizer, a filter that is evenly
dark in the
> center then lightens at the edge (like a gradient filter) to
compensate for
> light fall-off?
The problem with using a polarizer on Ultra-Wide Heliar is that it's
a rangefinder lens. You can't see the effect of the polarizer as
you rotate it. Leica and Mamiya make special polarizers for their
cameras that can be swung out to show in the viewfinder. Leica
comes with adapters for 39mm and 46mm and Mamiya should work with
58mm and 67mm. Not really helpful with 77mm filter thread. The
only way to make this work is to mark the side of the filter so that
you can view the effect through the filter and try to position the
filter in the same way when mounted on the lens. If there is a
polarizer as you described, it may be useful here.
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