After surfing the archives, I found the following inquiry to the list from
about 2 years ago (taken verbatim):
I've lately acquired a 300 mm F2.8 A* big glass and naturally am looking
for ways to burn off the extra F stops. If I read the materials correctly
300mm is sort of the breaking
Hi Jerome,
You wrote:
with an FA 300mm 1:2.8, would one have the option of using
either the 2x-S or the 2x-L? and if so, is the optical
difference neglible?
AFIR, the Pentax lens accessories booklet printed between 198x
and 1990(ish) states something like: Up to 300mm... -S...,
over 300mm
Jerome,
Wish I could help you. I only have the 1.4X-L and a Tamron 7 element
AF 2X converter. The L converters will also fit the FA* 200/2.8
(which I have and use regularly). On the 200/2.8 or 400/5.6, there is
a marked difference in contrast between the two converters. Comparing
Thanks, Bruce and Mike.
Mike Wrote:
The F*300ED(IF) is listed under
the -S list of lenses WHICH ARE UNSUITABLE.
Not exactly. For the 1.4x-L half of the table, it's listed as vignetting
at picture corners... but it's not listed in the usuable table at all for
the 2x-S half; hence logic would
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