Optec Inc. 15mm T-thread Extension Ring

Optec Inc. 15mm T-Thread Extension Ring: Precision Spacing for Astrophotography T-Thread Compatibility: Designed to fit standard T-threaded connections, making it ideal for astrophotography setups. 15mm Extension: Provides an exact 15mm spacing, crucial for achieving the correct back focus in imaging systems. Easy to Use: Simple screw-on attachment for quick and efficient setup changes. Durable Build: Constructed with high-quality materials for lasting use and reliability. Versatile Use: Essential for photographers needing precise spacing adjustments in their telescope or camera setups. Specifications Outside Diameter: 1.84" (46.74mm) Overall Height: .79" (20mm) Clear Aperture: 1.5" (38.1mm) Weight: .4oz (11.3g) Back-Focus Usage: .59" (15mm)