Aperture: |
254mm (10”) |
Focal Length: |
2000mm |
Focal Ratio: |
f/8 |
Optics: |
True Ritchey-Chrétien dual hyperbolic mirror reflector |
Mirrors: |
Low thermal expansion quartz, 99% reflectivity dielectric multicoatings |
Secondary Mirror Holder Obstruction: |
110mm (43% by diameter, 18.75% by area) |
Optical Tube: |
Carbon Fiber and machined composite front and rear cells |
Field Stops: |
None |
Focuser: |
“Linear bearing” 3” Crayford with dual-speed 10:1 reduction ratio fine focus; 2” and 1.25” compression ring accessory holders |
Camera Mounting: |
360° rotating camera angle adjuster |
Focuser Travel: |
2” (50.4mm) with 1/16th inch and millimeter scales on drawtube for repeatable focus |
Back Focus: |
9.25” (235mm) from rear cell, 5.5” (140mm) with focuser installed |
Extension Rings (to adjust back focus): |
three total, two measuring 1” in length and one 2” in length |
Tube Length (without focuser): |
24.75” (628mm) |
Tube Length (with focuser): |
28.25” (717mm) |
Maximum Tube Length (with all three extension rings and focuser drawtube fully extended): |
34.25” (870mm) |
Tube Weight (without focuser): |
33.15lb (14.6kg) |
Tube Weight (with focuser): |
35.4lb (15.6kg), add 6.4 oz for each 1” extension and 14.4 oz for 2” |
Dovetail for Connection to Mount: |
21” long Losmandy-style “D-plate” dovetail |
Dovetail for Mounting Accessories: |
21” long Losmandy-style “D-plate” dovetail |