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Re: [OM] Filters Filters Filters

Subject: Re: [OM] Filters Filters Filters
From: "Donald MacDonald" <d1956m198d@xxxxxxxxxxxxxxxx>
Date: Mon, 10 Mar 2003 19:42:50 -0000
Hoya HMCs are pretty good, though admittedly my experience with other brands
is limited. Most of mine are HMC, a couple are Olympus and I have another
couple of Jessops' and one B+W.

I tend not to use them for photography until required, these days. The
photographs I posted the other day used no filters. My 35/2 was once saved
by a covering filter when it face-planted in gritty mud...

On the subject of quality, I read somewhere (Langford? or was it in a
magazine?) that the curvature in an 'optical flat' (astrophotographers will
know...) closed at about 20 miles diameter or so. The tolerance for
'flatness' in  a filter is much less critical, so they come in about 6
miles. Not very flat, then?

Donald.

-
Donald Neil MacDonald, BA DipLIS
www.bigmac1st.freeserve.co.uk


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