Curved Vane Spiders for Retrofits and New Builds
Curved vane secondary spiders virtually eliminate the defraction spikes
common to Dobs and Newts with straight vane spiders. These premium
spiders are made primarily of aluminum for sturdy construction and light
weight. The unique center bolt, spring, and tensioning nut make collimation
easy while allowing a large adjustment range. Vanes 1/16" thick, 1.5" wide
on Professional series, 1" wide on Meduim and Large Sizes. Vanes 1/8" thick
and 1.5" wide on Observatory series. Flat black finish. With Secondary Holder.
(mirror not included)
The retrofit series of four vane spiders is designed to replace factory spiders
on production Dobs with no drilling necessary. Your factory secondary mirror
holder and mirror fits on the new curved vane spider. Please check the
diameter of your factory secondary holder center stalk and select the proper
retrofit below. Mirror and holder not included with retrofit spiders!
Collimation thumbscrews are available as an option to replace the allen
screws, select below.
A dew heater upgrade provides an insulated vane to route power to the
heater, and the secondary center hole is enlarged for heater placement.
Heater not included.
Be sure to select your scope tube diameter below!
Retrofits For 6" to 12" tubes: Large 4 Vane Spiders
Retrofits For 11" to 16" tubes: Professional 4 Vane Spiders
Retrofits For 14" to 24" tubes: Observatory Grade 4 Vane Spiders
For 6" to 14" tubes: Medium Series 3 Vane Spiders
For 8" to 14" tubes: Large Series 3 Vane Spiders
For 10" to 18" tubes: Professional Series 3 Vane Spiders
For 14" to 24" tubes: Observatory Series 3 Vane Spiders
For 10" to 18" tubes: Professional Series 4 Vane Spiders
Select your scope tube inside diameter here:
Price includes shipping in the USA!