The only thing special about it is it's a Pentax part made to work with specific Pentax lenses.

On 3/24/2026 5:40 PM, Ralf R Radermacher wrote:
Am 24.03.26 um 21:33 schrieb John Sessoms:
PENTAX circular polarizing filter FA x (with case) 35184

Is there anything special about the Pentax version or is this an 'ordinary' circular polarizing filter for a 112 mm thread like this one:

https://www.ebay.com/itm/317514597737

Could be had from a number of manufacturers. Given the choice, I'd recommend Heliopan.

Ralf

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