The Ohio State University College of Mathematical & Physical Sciences Department of Astronomy

Here are specifications for new filters for OSMOS. Anyone interested in purchasing new filters for OSMOS are strongly encouraged to contact Paul Martini in advance.

Physical Parameters:

Size: 101.5 x 101.5mm (+-0.5mm)

Thickness: 7mm (+-0.5mm)

Parallelism: <2 arcminutes

Chamfer: 0.5mm on all edges

Edge: fine ground, painted black

Operating temperature: -10C to +20C

Optical Parameters:

Clear aperture: 90% of physical size

Angle of incidence: 8 degrees

Surface flatness: 1 wave PV at 633nm over clear aperture

Surface quality: 80/50 scratch dig