Yes, I bought Brett's. Seems I end up with a lot of Brett's gear
FOV issue not an issue to me really - the 5dMkII with FR needed such a harsh crop, the end result may well have been taken on an APS-C format camera. Less artistic licence for framing, but there are waysto compensate
I am thinking about going back to f/9 more often - especially for GX work which is my primary interest (seeing I suck at it so badly!), and back to PN imaging, when the GOOD targets pop up mid-winter again. Diffuse neb are nice and fun, but it's the PN's that fascinate me, considering the science behind them.