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Re: [OM] Filters Filters Filters

Subject: Re: [OM] Filters Filters Filters
From: "John Hermanson" <omtech@xxxxxxxxx>
Date: Tue, 11 Mar 2003 08:29:13 -0500
Most, if not all,  Olympus filters are made by Hoya.
_________________________________
John Hermanson  www.zuiko.com
Camtech, Olympus Sales & Service since 1977
21 South Lane, Huntington NY 11743-4714
631-424-2121 For Free Olympus manuals,
please call 1-800-221-3000
_________________________________
----- Original Message -----
From: "Donald MacDonald" <d1956m198d@xxxxxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Monday, March 10, 2003 2:42 PM
Subject: Re: [OM] Filters Filters Filters


> 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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