Ash-Dome
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Frequently Asked Questions About Ash-Dome Observatories
What size Ash-Dome do I need for my telescope?
Dome size depends on your telescope's swing diameter — the circle traced by the longest dimension of your optical tube assembly as it rotates through all positions. Measure from the back of your imaging train to the front of your dew shield, double that number, and add clearance for cables and accessories. As a rough guide: most setups with 8" to 11" SCTs or small refractors fit comfortably in a 10'6" dome; larger refractors and 12"–14" RCs typically need 12'6" to 14'6"; and observatory-class instruments (16"+ aperture, PlaneWave CDKs, large Newtonians) often require 16'6" or larger. Deep Space Products can help you calculate the right size for your specific equipment.
How weather-tight are Ash-Domes in heavy rain or snow?
Ash-Domes are engineered for severe weather. The Galvalume® steel construction and precision-fitted shutter system create a weather-tight seal when closed. Owners consistently report completely dry interiors even after heavy storms. Proper application of the supplied glazing compound during assembly is critical for long-term waterproofing — Ash-Dome provides detailed instructions, and many owners report the sealant performing well for years with annual inspection.
Can an Ash-Dome be fully automated for remote or robotic imaging?
Yes. While Ash-Dome supplies motorized rotation and shutter operation with manual controls, third-party automation systems add ASCOM-compatible dome tracking, weather sensor integration, and TCP/IP remote control. The ACE SmartDome controller (from Astronomical Consultants & Equipment) and Astrometric Instruments' DomePro system are popular choices designed specifically for Ash-Dome products. Deep Space Products can advise on automation options and integration with your imaging software.
What's the difference between Type A and Type B shutters?
Type A shutters have a two-part design: the lower section can stay down as a windscreen while the upper section opens, or both sections can be raised together for full aperture access. This is ideal for sites with obstructed horizons, light pollution, or windy conditions. Type B shutters drop out completely, providing unobstructed viewing from 0° to 105° altitude — best for remote sites with open skies where horizon-to-horizon tracking is common.
How does Ash-Dome compare to fiberglass observatory domes?
Fiberglass domes (such as Sirius Observatories) offer lower cost and lighter weight, but steel Ash-Domes provide superior structural rigidity, longer service life, and better weather resistance over decades. Fiberglass can flex under wind load and degrade with UV exposure; Galvalume® steel maintains its integrity in extreme conditions. For permanent installations intended to last 20+ years, Ash-Dome's construction typically justifies the higher investment. Deep Space Products can help you weigh the tradeoffs for your specific project.
Does Deep Space Products sell and install Ash-Domes?
Deep Space Products offers the full Ash-Dome product line with expert consultation on dome selection, sizing, and observatory planning. We help customers integrate Ash-Domes into complete observatory systems — including mounts, telescopes, automation, and pier design. For installation, Ash-Dome provides supervision for Model M domes, and DSP can recommend qualified contractors or integrators depending on your location and project scope.
How difficult is Ash-Dome installation, and do I need professional help?
Model R domes (up to 16'6") ship on a single pallet and can be assembled by a team of 4–6 people over a weekend. The shutters are heavy — some owners rent a crane or use creative rigging to position them. Ash-Dome provides detailed assembly manuals, and their support team is responsive to questions. Model M domes (18'6" and larger) require on-site supervision from Ash-Dome due to component weight and assembly complexity. For any size, having experienced help — or at least one person who's done it before — makes the process significantly smoother.
What maintenance does an Ash-Dome require?
Ash-Domes are low-maintenance by design. Annual inspection of the glazing compound at seams, lubrication of rotation bearings and shutter rollers, and periodic electrical checks are typically sufficient. The Galvalume® steel exterior requires no painting and resists corrosion without ongoing treatment. Many owners report 20+ years of service with minimal upkeep beyond these basics.
