I finally got round to painting my hardboard aperture mask matt black today, but not before I cut a further two holes. I now have three holes of 170mm, 130mm and 100mm. These provide further options when the seeing is not so good and effectively provide 'four scopes' in one: 16" f4 (actually f4.5 with the Paracorr as focal length is increased to 1840mm) 6.7" f11 5.1" f14.2 4" f18.4 I have made some flaps held in place with velcro to cover the holes not utilised and it will be interesting to