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Re: [OM] teleconverter

Subject: Re: [OM] teleconverter
From: Winsor Crosby <wincros@xxxxxxx>
Date: Wed, 4 Feb 1998 19:32:12 -0800
>Gary Reese wrote in response to:
>
>>
>><< Does anyone know if there is an optical reason why the Zuiko 2X-A
>>teleconverter is not recommended for lenses other than the 100, 135's,
>>200--f/4, and 100-200? >>
>>
>>The Lens Lexicon chapter to "The Olympus OM System Lens Handbook" gives a
>>clue.  It states that "The OM System Teleconverters are carefully designed
>to
>>achieve maximum sharpness, and suitable lenses are clearly indicated."
>Hence,
>>there is just too much optical compromise *to the designers* to state that
>the
>>2X-A can be used with other lenses.  What is acceptable is up to you,
>though.
>>
>>I saw one of these new (in box) going for $94 US at Golden Triangle in
>Tampa,
>>FL.  That was last November.  I was probably nuts not to buy it - they had
>a
>>new T-32 for $97, also - but I was hard up for money at the time.  I doubt
>I'd
>>use one, though.  The light loss is too much and I doubt I'd be happy with
>the
>>optical performance.
>
>
>What piqued my interest was the last sentence.  I too have a perfectly fine
>2X teleconverter that is optically matched to my 300mm telephoto.  I find
>its best use is a paper weight.  The prime lens delivers sharp images with
>excellent contrast, even in poor conditions.  With the converter, images
>seem soft and flat.  I've gone as far as to do controlled comparisions with
>a tripod.  The 2X just doesn't cut it.  Has anyone used a teleconverter/lens
>combination that works??
>
>John P

John,

I have an old "Olympus OM System"brochure that I got when I bought my OM4T
several years ago. It says that the 2X is_not_recommended for the 300mm
lens. It says:

"2X-A Applicable lenses: 100mm F2.8, 135 F3.5, 200mm F4, 100-200 F5;
Optical construction 6-6
1.4X-A Applicable lenses: 180mm F2, 300mm F4.5, 350mm F2.8, 400mm F6.3;
Optical construction 5-4."

I have seen some slides shot with the 2x and the 400mm which is not
recommended and they look pretty good.

Winsor



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