Re: [Leica] No-filter convert

[Jim Brick <jim@brick.org>]

Thank you very much M... Boreham . I have been quoting Leica literature for
some time now but for some reason people will only believe what they want
to belive, regardless of the source. But I will continue to attempt to
educate. Thanks again for the boost.

Jim


At 06:31 PM 3/23/98 +0000, you wrote:
>As a recent convert to the "no protective filter" school I offer the
>following to encourage other people who feel naked without one!
>It is an extract from the Broadsheet published by Williams of Hove (now
>Hove Camera Co again) one of the biggest Leica agents in the UK. It is part
>of an account of their tour of the factory at Solms.
>" We were then shown an almost unbelievable test to check the hardness of
>the coating on the front element of a lens. Definitely not something to try
>at home this one"
>"They take a wad of squidgy polymer compound into which is embedded an
>extremely hard, gritty substance. This is brought directly into contact
>with the coated surface of a lens element and ground into it at a
>substantial pressure for a precisely measured time. OUCH ! At the end of
>this process, the front element is examined with a powerful glass and if
>there is any sign of scratching in the surface of the coating, the setting
>of the coating machine is re-calibrated."
>"Leica are so confident in their modern lens coatings that they maintain
>the use of a UV filter on a current production lens is totally unnecessary.
>This is not only because the coating is so hard that it does not need the
>further physical protection of another piece of glass in front of it, but
>also because the highly efficient modern coatings effectively filter out
>the UV radiation without the need of any further assistance. Leica go even
>further and say that there is a possibility that the use of a filter could
>even degrade the performance of a lens."
>
>Mike
>
>P.S. For sale:- 3x Leica UV filters (E46), one B&W UV (E60) all unmarked !
>                       
>