Collimate Primary Mirror T-Shirt | Umbravoid
Collimate Primary Mirror T-Shirt | Umbravoid
Step one of every reflector's tune-up: collimate the primary mirror. Get those three screws just right and stars sharpen to pinpoints; ignore them and every view stays soft. 'Collimate Primary Mirror' wears the maintenance mantra every Newtonian and Dobsonian owner mutters before a clear night. For telescope tinkerers who know that great optics are earned, not given. A premium tee for the collimation-obsessed observer and a knowing gift for any reflector owner. Available in 7 sizes (S–4XL) and 10 colorways.
- 100% soft ring spun U.S. cotton fabric & cotton threads
- Proud member of the U.S. Cotton Trust Protocol
- OEKO-TEX certified low-impact dyes
- Salt free clean pigment dye colors
- Plastic-free packaging — polybags removed on all colors except White
All of our shirts are shipped directly from the United States. Orders are processed within 1 to 2 business days and 4-6 days of delivery
- The standard shipping fee is $5.99
- All orders over $99 is free shipping
Organic Cotton
GOTS certified. Grown without pesticides. Soft, breathable, built to last decades.
Colorfastness
Water-based inks cured at 320°F. Wash after wash, the design stays as sharp as the night sky.
Peer Reviewed
Every design is verified against current astronomical data. Coordinates are real. Objects are real.
Made in USA
Produced in the United States. Shorter supply chain, lower footprint, faster delivery.