I`m quite disappointed to report that 3x3 mattebox (the one with rubber shade) doesn`t fit to A1 and it can not take Cokin P filters as described in product spec sheet.
As I was assuming the on-board mic blocks the filter holders so the matte box can not be attached without modifying the filter holders, simple cut will fix that but still no way to use Cokin P sized filters as there isn`t any holders that can hold even a P sized ND grad in that matte box.

T

You might be a little happier with a matte box that is 4x4 or better.
I use a 4x4 matte box on my A1 and it works just fine.

You might be a little happier with a matte box that is 4x4 or better.
I use a 4x4 matte box on my A1 and it works just fine.

What kind of 4x4 matte box do you have?

What kind of 4x4 matte box do you have?

At the moment I have a Cavision 4x4 bellows matte box and rail system mounted to the A1.