The Explore Scientific 3-Inch Dielectric-Coated Diagonal Mirror is a premium accessory built for telescopes that require a larger light path and demand maximum image brightness and clarity. Featuring a first-surface dielectric mirror with 99% reflectivity, this diagonal delivers crisp, vivid visuals—perfect for deep-sky viewing and detailed lunar or planetary observation.
Designed with convenience and safety in mind, the double-tapered 3" barrel ensures a secure fit in your focuser and minimizes the risk of accidental drops, even with loose thumbscrews. The included compression ring lock system on the 2" eyepiece holder protects your accessories from scratches and provides a firm, stable grip.
Its rugged yet lightweight construction makes it an excellent choice for both portable observing kits and permanent installations. A 2" to 1.25" adapter is sold separately for added flexibility.
CA Residents: Prop 65 WARNING(S)
⭐ Features & Benefits
- 99% reflective dielectric mirror for high light transmission and image clarity
- Double-tapered 3" barrel provides smooth insertion and secure positioning
- Compression ring lock system protects and secures 2" eyepieces
- Compatible with 1.25” eyepieces via optional adapter (sold separately)
- Lightweight, durable construction for long-lasting performance
-
Dust covers included to protect the mirror and housings
🌟 Who It’s For
- Observers using large-aperture telescopes with 3" focusers
- Visual astronomers seeking maximum brightness and contrast
- Users who value secure eyepiece placement and equipment safety
- Both portable setup enthusiasts and observatory owners
🎯 What You’ll Be Able to See
- High-contrast views of nebulae, galaxies, and globular clusters
- Bright, detailed lunar landscapes and planetary features
- Vivid star colors and fine double star separations
🎒 What’s Included
- Explore Scientific 3" Dielectric-Coated Diagonal Mirror
- 2” adapter with compression ring
- Protective dust caps for both ends
- Product documentation
Specs
| Item Number | DD03–01CF |
| Weight | 2.0 lb / 0.90 kg |
| Length | 104.8mm |
| Width | 60.9mm |
| Height | 127.0mm |
| Eyepiece Compatibility | 3.00" and 2.00" (adapter included) |
| 1.25" Adapter | Optional (sold separately) |
Warranty Information:
This product includes a Limited One-Year USA Warranty, which converts to the Explore STAR Transferable Extended Life of the Product Warranty when registered within 60 days of purchase.
To activate your warranty, register your product at:
www.explorescientific.com/pages/product-registration