Use of matte box with Sony A1
 

Hi folks

The Cavision website apperas to show pics of an A1 with a Sony VCL HG 0737Y wide converter plus Cavisions MB 385P matte box AND their MBF-3 french flag. However, as you presumably need to use the wide angle matte box MB 385PW with the Sony wide converter and that box is (according to Cavision) not compatible with the french flag, it seems odd that they show this combination.

Has anyone used the standard MB385P and french flag with the converter lens without problems 9other than on extreme wide that is?

Alan