TeleGizmos 18"-20" F/4.5 Truss Tube Dobsonian Standard Full Scope Cover

An 18" or 20" f/4.5 truss-tube Dobsonian is a powerhouse of light-gathering potential—perfect for sweeping up faint galaxies, teasing out spiral arms, and resolving globular clusters to the core. But when your big Dob is parked horizontally in its rocker box between sessions, it still needs protection from dew, dust, and ambient grime. The TeleGizmos Standard Series Full Scope Cover is made to do just that: give your horizontal Dobsonian a rugged, weather-resistant layer of defense without requiring disassembly or vertical storage.

Features

• Tailored for Horizontally Parked 18"–20" f/4.5 Dobs
  Sized specifically to fit fully assembled 18" and 20" f/4.5 truss-tube Dobsonians resting in a horizontal parked position. The cover shields the full optical assembly—including the upper cage, truss poles, and mirror box—while it's cradled in the rocker arms.

• Durable, Reflective, Multi-Layer Fabric
  Made from double-laminated polyethylene with a highly reflective silver outer coating. This helps deflect solar heat and UV radiation while guarding against dew, leaves, dust, and bird droppings during both day and night.

• Water-Resistant and Tear-Resistant
  Ideal for overnight or weekend observing sessions, this cover is built to handle wind, light rain, and moisture condensation. It’s also a reliable shield in covered observatories, carports, or garages.

• Quick, Secure Fit with Drawstring Hem
  The open-bottom design slips easily over your scope without lifting or wrestling. A built-in drawstring hem lets you cinch the fabric around the rocker box or baseboard to secure the cover against shifting and drafts.

• Sized for Long-Tube Dobs in Horizontal Configuration

  • Length: Approx. 90"

  • Circumference: 150"

  • Weight: ~5 lbs

This model is a perfect match for Obsession 18"/20" Classic, StarStructure, Hubble Optics UL truss designs, and similar large-aperture f/4.5 Dobsonians left assembled between uses.

Observing Tip: Parking your Dob horizontally is a common and smart choice—it lowers the center of gravity, protects the secondary mirror from overhead dust, and makes the scope more stable in breezy conditions. A fitted cover like this one completes the equation, sealing out the elements so your optics stay clean and collimated. More stargazing, less fuss.