I've looked at that previously, but I don't think it will fit the FA* 600mm f4.

Best I can tell it's a 49mm filter and the 600/4 is 43mm.

I'd be willing to substitute that one IF I knew it would fit, but someone who knows Pentax lenses better than I would have to let me know it would fit.

If anyone on the list KNOWS that it WILL fit, I'd be interested in knowing.

On 3/24/2026 6:50 PM, mike wilson wrote:
Found one for a 645.  No idea if it will be suitable for your purpose.

https://www.ebay.co.uk/itm/358355970008

On 24/03/2026 20:33 GMT John Sessoms <[email protected]> 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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