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 .... -L..."
To me, that reads that 300mm lenses are recommended to use the
-S series of TCs.
Unfortunately, the actual operating manual for the TCs (as
available on the Pentax website) is more than confusing. For
the -S convertors it shows a list of lenses listed as UNUSEABLE
("Combine SMC lenses not listed below with the S-type rear
convertors) and for the Ls it shows a list of the lenses
suitable ("Only combine the lens listed below with L
convertors") both tables having "long" and "short" lenses.
According to these tables the FA300/2.8 does not exist, as the
leaflet was printed in 1990. The F*300ED(IF) is listed under
the -S list of lenses WHICH ARE UNSUITABLE.
Which is about as clear to me as the great, grey-green, greasy
Limpopo river, all set about with fever trees.
Mr Kipling
Who makes exceedingly confused photgraphers
