My results from three lenses: FA*24/2: No vignetting with square filters if the holder is placed so that the filters slide in horizontally. Vignetting down to f/5.6 (ca) if holder placed so that filters slide in vertically (as you would have it if you use grads), and when using pola.
A-24/2.8: Same as for the FA*, but less pronounced. Pola filter acceptable, IIRC. I sold this lens a couple of years ago. FA-20/2.8 With square filters, slight vignetting even if holder placed so that filters slide in horizontally. Notable vignetting with pola filter even at f/8. You should also consider that even though Cokin provides adapter rings for lenses up to 82mm, the physical opening in the holder (through which light can reach the lens), is only 75mm! Best, Jostein ----- Original Message ----- From: "Dean" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, October 19, 2001 4:15 PM Subject: Cokin ND grads and K mount wide angles > Can you use a Cokin style P-series filter mount on the Pentax K-mount 20mm > and 24mm without noticeable vignetting? (I'm thinking of a modified mount > with the outer filter holders shaved off) > thanks > -dean > - > This message is from the Pentax-Discuss Mail List. To unsubscribe, > go to http://www.pdml.net and follow the directions. Don't forget to > visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
