8PCS 3/5/7/10/12/15/20/30MM Focal Length Extension Ring Kit M48x0.75mm Astronomical Telescope Accessory

8PCS 3/5/7/10/12/15/20/30MM Focal Length Extension Ring Kit M48x0.75mm Astronomical Telescope Accessory

Features:
- Fully metal construction and anodizing aluminum process, durable for long time use.
- Use this extension tube for getting the correct image scale or the exact spacing required for reducers or field flatteners.
- The extension tube has a M48 interior thread and a M48 exterior thread for solving spacing problems in astrophotography and eliminates a range of focusing problems.

Specification:
- Type: astronomical M48 thread extension tube
- Male thread: M48x0.75mm
- Female thread: M48x0.75mm
- Link or extend tube length of the M48x0.75 products
- Color: black
- Length: 3mm, 5mm, 7mm, 10mm, 12mm, 15mm, 20mm, 30mm

Package Included:
- 8 x Focal Length Extension Rings (3mm, 5mm, 7mm, 10mm, 12mm, 15mm, 20mm, 30mm)