Archived posting to the Leica Users Group, 1998/01/26

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Subject: Re: [Leica] Summilux-m 35mm f1.4 asph & uv filter
From: "Jacques Bilinski" <>
Date: Mon, 26 Jan 1998 18:33:35 -0800

> I am using the 35mm summilux-m f1.4 asph with the Leica uv (13004)
filter. Someone told me
> that I was loosing the sharpnes of the lens with that filter. Any
comments from users?
> I always beleived good quality uv filter did not altered the quality of
the lens.

The conventional wisdom is that Leica lenses do not require additional UV
filtration because they already incorporate sufficient UV filtration
without a filter. Adding any air-glass surface, even one with the best
multicoating available will cause a small amount of flare. This is why zoom
lenses tend to exhibit more flare than single focal length lenses with
fewer elements. It's also a primary reason for the use of expensive
aspherical lens elements - it enables lens designers to design lenses with
fewer elements. Some photographers use UV filters on their Leicas
exclusively to protect the more expensive lenses from scratches etc.,
others do this only when the conditions are hazardous (this is what I do).

 Hope this helps. - Jacques.