Archived posting to the Leica Users Group, 2000/02/06

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Subject: Re: [Leica] 40.5 Filter on Summarit???
From: Gaifana@aol.com
Date: Sun, 6 Feb 2000 10:49:47 EST

Wasn't it a Contax standard and then a Russian standard and then a Nikon 
standard first? Then (if I recall), it was later the standard on Tessars, 
Minolta CL/CLE, Zone VI spotmeters, enlarging lenses, etc. The Japanese did 
not make lenses with this filter size until relatively late in the game, so 
did the JIS standard follow all of this?

BTW: What explains Leica's modern penchant for odd filter sizes? Monopolistic 
reasons? Pre-war, I can see that they were the standard, but postwar they 
seemed to have introduced some new sizes that didn't match anyone else's 
filter or lens production. And Leica's current filter selection is very basic.

 This is significant when you're looking at used Leitz 39mm SL filters that 
run $25, when B+Ws new in most sizes run less. Even 39mm Hoyas end up in the 
Leica section of the used camera shop and become more pricey than their 
40.5mm counterparts. Why not something more fun like bayonet filters if 
you're going to use nonstandard sizes? What small cameras need is something 
like the old Rolleis had - easy to detach filters.

In a message dated 2/6/00 9:20:29 AM, jbcollier@home.com writes:

<< The 40.5 filter is a JIS standard and uses a different thread pitch from 
the
leica lenses. It still may work but try very gingerly as it is very easy to
mess up such fine pitch threads! Personally I would buy E41 filters and not
risk toasting the summarit as I assume the glass is good. There a E41
filters available used and NOS at all the usual used Leica sites and auction
sites.

John Collier

> From: Javier Perez <japho@cunyvm.cuny.edu>
> Date: Sun, 06 Feb 2000 01:00:05 -0500
> Subject: [Leica] 40.5 Filter on Summarit???
> 
> Very Simply
> Can I get away with using a standard 40.5 size
> filter on an E41 Summarit? More than any other lens
> this one needs a filter for protection!
> Anybody tried it?

</XMP>

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Date: Sun, 06 Feb 2000 07:11:40 -0700
Subject: Re: [Leica] 40.5 Filter on Summarit???
From: John Collier <jbcollier@home.com>
To: <leica-users@mejac.palo-alto.ca.us>
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