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Re: [OM] Teleconverters - which ones to use?

Subject: Re: [OM] Teleconverters - which ones to use?
From: "George M. Anderson" <george@xxxxxxxxxxxxxxxxxx>
Date: Wed, 12 May 1999 09:48:37 -0700
Dan;

Shoot normally. While the camera doesn't know the actual aperture is say
f/8 instead of f/4 when you've got a 2X TC mounted, the light meter will
see the difference.

George

Dan Lau wrote:
> 
> On Mon, 10 May 1999 21:21, Chuck Norcutt <norcutt@xxxxxxx> wrote:
> >Someone already mentioned that the 1.4X gives a one stop loss (square
> >root of 2).  The 2X gives a 2 stop loss (square root of 4) and the 3X
> >gives a bit more than a 3 stop loss (3 stops would be the square root of
> >8 = 2.83)
> 
> >A 200mm f/4 with a 1.4X converter becomes a 280mm f/5.6 (200x1.4 =
> >280mm,  4x1.4 = 5.6)
> 
> >A 200mm f/4 with a 2X converter becomes a 400mm f/8 and
> 
> >A 200mm f/4 with a 3X converter becomes... hard to focus (600mm f/12).
> 
> This brought up a question that I've always wanted to know about
> teleconverters.  I use an OM-1(n) camera, do the teleconverters
> automatically account for the shift in aperture in transmitting
> the information to the OM-1(n) body?  In other words, when a
> teleconverter is mounted, should I continue to use the "center
> the needle and shoot" method or must I do some mental compensation
> for the loss of light (i.e., center the needle first, then open
> it up two-stops for the 2X and so on).  Thanks.
>         -Dan
> 
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