I've been thinking about it for a while, but after reading @johninderby's review of the Lacerta wedge with the Brewster angle I pulled the trigger. I went for the 1.25" version to sit on the 100mm (they recommend the 2" for 120mm aperture and above) and I love it, also got the polarising filter for the extra contrast. Managed to have first light within an hour of delivery, although there's lots of cloud and lots of haze between the clouds so by the time I played around with various ada