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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