Starlight Innovation SCIII Star-Chair III - SCIII Astrographs please make sure you check

please make sure you check the Inside Diameter (ID) measurements of the assembly in question before you buy

You also see three lighted target rings set against the sky which appear to be at infinity

Field Stop (mm): 38

1060 mm Tube Length w/out Dew Shield: 33

Internal safety stop prevents 2" barrels from hitting the mirror

Starlight Innovation SCIII Star-Chair III - SCIII Astrographs please make sure you checkStarlight Innovation SCIII Star Chair III Adjustable Height Astronomer's Chair Strong Wooden Construction Top quality 13 ply Baltic birch plywood and Canadian ash Adjustable height Seat, 10" up to 32" Supports up to 250 pounds Water based lacquer finish Weighs only 13 lb (5. 9 kg) This Starlight Innovation SC1 Star Chair III is specifically designed to provide secure and comfortable seating for astronomical observations as well as other optical tasks.