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Re: [OM] teleconverter dilemma

Subject: Re: [OM] teleconverter dilemma
From: "C.H.Ling" <chling@xxxxxxxxxx>
Date: Mon, 12 Nov 2001 09:38:51 +0800
Hans van Veluwen wrote:
> 
> : Is there a hidden catch with the iS/L teleconverter ?
> 
> There are a couple, compared to the OM 2xA:
> - the minimum focus distance increases (stays the same with with 2XA)
> - you can't use filters
> - you can't use a hood
> 
> The iS/L B converter otoh has the big advantage that it does not alter the
> speed - a 230mm/F2.8 lens is much more practical as a 270mm/F5.6 lens.
> 
> hnz

I think you can never break the magic formula in 35mm film system: 

Front lens diameter/focal length=largest aperture of the lens.

e.g. if you want the 100/2 become a 170mm/2 you need at least 85mm
diameter front element. I think the B300 is smaller than 85mm. 

C.H.Ling

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