[perrin6 (Alan)]

Used Bintel 150mm F8 mirror with undersized Edmund Optics 22mm diagonal for High-contrast Telescope design. Both less than 1 year old. Mirror close to diffraction-limited (eg: Cassini div. in Saturns rings easily seen). I used these optics in home-made, max-contrast scope with wire spider and was very pleased with performance on moon, planets and double stars. The undersized diagonal is not recommended for fully-illuminated low power but views of extended objects such as nebulae were still pleasing due to the high contrast. $140 posted.