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RE: [OM] Autocollimator tests on filters

Subject: RE: [OM] Autocollimator tests on filters
From: "Ron Spolarich" <caesar2@xxxxxxxxxxxx>
Date: Fri, 3 Mar 2000 23:19:49 -0500
Gary: I noticed no mention of any B+W glass.  Obviously, pricey but I'm
curious how they would stack up?

RonS

> -----Original Message-----
> From: owner-olympus@xxxxxxxxxxxxxxx
> [mailto:owner-olympus@xxxxxxxxxxxxxxx]On Behalf Of Gary Reese
> Sent: Friday, March 03, 2000 4:25 AM
> To: Olympus OM Mailing List
> Subject: [OM] Autocollimator tests on filters
>
>
> As I promised a few months back when I first posted SQF results for a
> "bad" filter on a 50mm lens, here are Vertical Autocollimator tests of
> 43 different filters. All are used, with 49mm filter thread, and have
> originated on lenses I've bought. No effort was made to bias the
> results.  This is simply a stack that has grown over time . . .
>
> Only 3 filters passed inspection, which is about a 93% rejection rate.
> Included as a rejection criteria was high flare.  Apparently some
> bargain brand manufacturers give little or no coating to their filters!
>
> Pass:
> Vivitar VMC Yellow 15
> Hoya UV
> Minolta L35 (UV)
>
> Fail:
> Vivitar 5R (multi-image)
> Promaster Spectrum 7 Cross Screen 8 pt
> Tiffen 80A
> Spectralstar
> Tiffen Haze 1
> Tiffen ND 0.6
> Hoya 82A
> Soligor Polarizer
> Cokinlight UV [absolutely terrible performance]
> Kenko LBW2
> Kalimar UV
> Promaster Spectrum 7 1A
> Gemko 1A
> Hoya 1A
> Toyo Optics 1A
> Hoya HMC 25A
> Vivitar VMC 1a
> Rokinon UV
> Kalt 80B
> Promaster Spectrum 7 1A
> Vivitar 1A
> Vivitat 1A
> BDB Sky
> Kalimar UV
> Vivitar Polarizing
> Tiffen Haze
> Hoya 1B
> Hoya UV
> Toyo Optics UV
> Hoya 1B
> Vivitar Cross Screen II
> Pro Polarizer
> Tiffen Sky 1A
> Cokinlight UV
> Asahi UV
> Hoya UV
> Vivitar UV-Haze
> Pentax L39(UV)
> Tiffen UV Protector
>
> My conclusion: marketing has really pulled the wool over many people's
> eyes. The owner of the Autocollimator says he tries to talk customers
> OUT of buying a UV filter with a lens purchase, based on what he has
> seen of filters over the years.  But he stocks them new since some
> customers can't imagine not using one.  Perhaps folks would be better
> off ordering a spare front element instead?
>
> Gary Reese
> Las Vegas, NV
>
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