Features:
* Anodized aluminum with matte-finished internal threads effectively reduces glare; the Length Extension Tube features M54×0.75 internal and external threads for a secure and durability connection.
* Addresses insufficient back focus distance: This Length Extension Tube extends the distance between the lens and camera, making it suitable for telescopes, lenses, MPCCs, guide scopes, and other devices, making sure optimal focus.
* M54×0.75 internal and external threads allow for secure stacking of washers and adapters; the Length Extension Tube maintains optical alignment for clear astronomical imaging.
* Available in multiple sizes: 3mm/5mm/7mm/10mm/12mm/15mm/20mm/30mm/40mm/50mm, meeting varying back focus requirements.
*Ideal for astronomical photography setups: Use the Length Extension Tube with a focuser, field flattener, or filter wheel to finely adjust the spacing for incisive, low-vignetting images.

Specifications:
*Product Name: Length Extension Tube for Astronomical Telescope Photography
*Material: Aluminum
*Size: approx.
Internal Thread: M54 x 0.75mm
External Thread: M54 x 0.75mm
Length: 3mm/5mm/7mm/10mm/12mm/15mm/20mm/30mm/40mm/50mm
*Color: Black
*Weight: approximately 5g-200g

Package Contents:
1 x Length Extension Tube