That specific part has the polarizing filter built in. It has a little
knurled knob that allows the polarizing filter to rotate.
https://image.pentaxturk.com/wp-content/uploads/2017/10/SMC-PENTAX-FA-CPL-filter.jpg
This is the part I'm looking for.
On 3/24/2026 5:35 PM, Larry Colen wrote:
I was curious about this and looked into it.
It seems that both lenses use a 43mm internal filter, and it isn't clear
whether you can use any 43mm filter.
AI seems to think that you can't use a circular polarizer as an internal
filter, but maybe that's just because it's hard to adjust it.
The 300/2.8 will take a 112mm (IIRC) front filter.
I'm curious what your specific goal is, and whether its worth trying to
get a more available 43mm CPL
On 2026-03-24 13:33, John Sessoms wrote:
I am looking for a Pentax item & wondered if the collective wisdom of
the list might help - either someone has it & wants to get rid of it
or knows WHERE I might find one for sale.
PENTAX circular polarizing filter FA x (with case) 35184
Apparently fits both the FA* 600/4 and the FA* 300/2.8.
I've checked KEH and B&H, messaged a camera shop in Osaka that has a
FA* 600/4 on offer on eBay and submitted a contact request at
ricoh-imaging.
No joy so far, although it's really too soon to expect anything from
Japan or Ricoh here in the U.S.
I hope one of y'all can help.
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