Archived posting to the Leica Users Group, 2002/01/11

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Subject: Re: [Leica] shade
From: "Bob Parsons" <bobp@ntlworld.com>
Date: Fri, 11 Jan 2002 23:57:59 -0000
References: <20020111032847.27483.qmail@web14005.mail.yahoo.com> <033c01c19a9e$4332d680$485e1c41@kc.rr.com>

For a number of months I've used 3M "Light Control Film"  over the frame
line illumination window to reduce rangefinder flare. If the Konnermann shade
is a similar material, then the answer is, it does help. It's disadvantage is the
brightness of the frame lines is reduced.

It's quite expensive but Edmund Optics sell a 2 x 3 inch sample strip for
$9.60

http://www.edmundoptics.com/IOD/DisplayProduct.cfm?productid=1976

I ordered on the US site and the UK based York office telephoned me to
confirm the order.

I tried the 0, 18 and 30 degree materials with different orientations on the
camera's illumination window. I found the 0 deg film with an acceptance angle
of 60 deg.to work the best. Part number NT52-390.

You need to orientate the film over the window so that the louvres are vertical
allowing a +/- 30 deg. horizontal acceptance angle. I left the protective covering
films on the strip until after I  had cut several rectangles out with scissors. You can
also cut it to size by scribing  and bending the film to snap it. I attached the light
control film to the camera using two very narrow strips of double sided adhesive
tape down each side of the window.

3M light control film is a fairly new material (developed for security screens and
LCD displays etc.) I'm curious to know if Leica have ever considered using this
material inside the viewfinder. There also several types of lens films for LCD displays
manufactured by 3M which look as if they might be a useful tool in optical design.

Bob Parsons.
bobp@dodo.demon.co.uk or bobp@ntlworld.com 



- ----- Original Message ----- 
From: "lea" <lea@whinydogpress.com>
To: <leica-users@mejac.palo-alto.ca.us>
Sent: Friday, January 11, 2002 12:48 PM
Subject: Re: [Leica] shade


> I have the same problem as you with flaring in the rangefinder and someone
> suggested a couple pieces of scotch tape over the little window up front. It
> has cut the problem down but not elimintated it entirely.
> 
> I haven't ordered the shade...so can't speak to it specifically.
> 
> ----- Original Message -----
> From: "Henry Ting" <henryting10@yahoo.com>
> To: <leica-users@mejac.palo-alto.ca.us>
> Sent: Thursday, January 10, 2002 9:28 PM
> Subject: Re: [Leica] shade
> :
> : I read the link. But the question is does it really
> : work ?
> :
> :
> : --- lea <lea@whinydogpress.com> wrote:
> : > Did this question get answered?
> : >
> : > Here's the
> : > link..........http://www.konermann.net/shade.html
> : >
> : > Lea Murphy
<< remainder snipped>>

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In reply to: Message from Henry Ting <henryting10@yahoo.com> (Re: [Leica] shade)
Message from "lea" <lea@whinydogpress.com> (Re: [Leica] shade)