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[OM] Re: Zuiko 100mm F2 + 2X-A teleconvertor

Subject: [OM] Re: Zuiko 100mm F2 + 2X-A teleconvertor
From: Michael Wong <mialop.wong@xxxxxxxxx>
Date: Mon, 16 Jan 2006 09:59:33 +0800
Hi, Moose,
Thanks for your reply.

I understood that the result will not be as good as a lens of prime of twice
the focal length, but it is much under my expectation.

It seems I should keep my Zuiko 200mm F4 MC.



Michael




2006/1/16, Moose <olymoose@xxxxxxxxxxxxxxx>:
>
> Michael Wong wrote:
>
> >Dear all,
> >Last week I tried to test Zuiko 100mm F2 ED + 2X-A teleconvertor. I
> >successed to in focus by look through viewfinder even the information
> said
> >that it is not applicable with Zuiko 100mm F2 ED. But I am very
> disappointed
> >that the image is not sharp, much worse than Zuiko 200mm F4 MC
> >.................
> >
> >Properly the 2X-A is not fit the lenses with "Floating element
> >close-distance correction mechanism".
> >
> >
> >There is an advantage that no focus length is increased if 2X-A is
> applied.
> >
> >
> So, you are disappointed that this combination works poorly, just as the
> instructions say it will work? That seems just a little bit unfair to
> Oly and the 2xA.
>
> Telextenders always have a negative effect on lens performance. With
> lenses for which the extenter is designed, the degradation may not be
> great, but is always there. With lenses for which it is not suited, one
> should not be surprised to get poor results.
>
> Take a look at the tests with and without extenders on Gary's test site.
> The results are never outstanding. He tried the 2xA with the 90/2,
> another unrecommended combo, and got poor results.
>
> Generally speaking, with lenses of the same general quality of design
> and manufacture, a prime of twice the focal length will always
> outperform a lens plus 2x telextender. It's no surprise at all that the
> 2004 outperforms the 100/2 plus 2xA. It also outperforms the 100/2.8
> plus 2xA, an Oly recommended combo. It's the nature of optical physics.
>
> Telextenders aren't magic, they are a shortcut, or subutitute, for use
> in situations where the longer lens is impractical or unavailable.
>
> Moose
>
>
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