------- Forwarded Message Follows -------
From: "Lex Jenkins" <lexjenkins@xxxxxxxxxxx>
To: olympus@xxxxxxxxxxxxxxx
Subject: Re: [OM] Filters, revisited
Date: Wed, 30 Aug 2000 01:24:24 GMT
AAAAAAHHHHHHHHHRRRRRRRRRRRRGGGGGGGGGGGGGHHHHHHHHHHHHH!!!!!!
I GIVE, I GIVE! UNCLE!!!
.... you win.... [sigh] .... I humbly submit to your expertise. This whole
.... kentucky .... thing has me chastened. Frank Ernens has uns*ubscribed
and raggedy ann - who's obviously a serious OMer and Zuikophile judging from
the recent eBay buying spree - might even become a Nikonista, all because of
my reckless pliers brandishing. And we never got a chance to find out what
kind of photography raggedy ann is interested in ....
>From where the pun now stands I shall flame no more forever.
Lex
===
>From: Gary Reese <pcacala@xxxxxxxxxxxxx>
>Subject: [OM] Filters, revisited
>Date: Tue, 29 Aug 2000 15:42:06 -0700
>
>I promised some more SQF tests with and without filters. Here are two,
>albeit at maximum aperture only - which is the aperture that the defects
>are most pronounced at.
>
>85-250mm f/5 Zuiko
>OM-4T with mirror and diaphragm prefire, sample 2
>@ 250mm setting
>Vignetting = B- @ f/5 with filter, A- @ f/5 without, A- @ f/8, A
>thereafter
>Distortion = moderate pincushion
>Aperture Center Corner
>f/5* C+ C+
>f/5 B B-
>f/8 B- B-
>f/11 B B
>f/16 B B-
>f/22 ** **
>f/32 ** **
>Notes: * = with Hoya Skylight filter, which exhibits moderate contrast
>images. Moderate contrast at f/16, moderately high at f/5-11. ** = no
>SQF or contrast data available at f/22-32.
>
>In short, the Hoya filter caused light fall-off and a reduction in SQF
>grade, primarly due to a contrast loss.
>
>100mm f/2.8 Zuiko (multi-coated)
>OM-4T with mirror and diaphragm prefire
>Vignetting = A- at f/2.8, A thereafter
>Distortion = slight pincushion (none?)
>Aperture Center Corner
>f/2.8* D C
>f/2.8 C- B-
>f/4 B B
>f/5.6 B+ B+
>f/8 A- B+
>f/11 A- A-
>f/16 B+ B
>f/22 B+ B
>Notes: * = with a Canon 1A filter, which exhibits low contrast images.
>Moderately low contrast at f/2.8 without filter, as well as f/4 and
>f/16-22, moderate contrast at f/8-11, moderately high contrast at f/5.6.
>
>Again, lower contrast and SQF grades . . .
>
>As the Monkees sang: "I'm a believer, I couldn't [use] her, if I tried."
>
>Gary Reese
>Las Vegas, NV
>
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