M54x0.75 Metal Focal Length Extension Tube 4/5/6/7/8/9/10/15/20mm Suitable for Astronomical Telescope Photography Extension T Ring(M54-8mm)

Description

• Name: M54x0.75 back focus extension ring
• Extension ring length: 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 15mm, 20mm.
• Scope of application: capture after photography
• Outer diameter: 60mm.
• Features:Black Matte Black Finish.

Model: YK22536
Origin: Mainland China
Pitch:0.75.
Package includes: 1x M54*0.75 extension tube.
image display:
M54x0.75 metal focal length extension tube 4/5/6/7/8/9/10/15/20mm suitable for astronomical telescope photography extension T ring
M54*0.75 extension tube rear intercept adjustment ring 4-20MM optional
Pitch:0.75.
External thread length: 3mm.
The internal thread lengths are as follows:
4mm - Internal thread length is 3mm.
5mm - Internal thread length is 4mm.
6mm - Internal thread length is 4.5mm.
7mm - Internal thread length is 5.5mm.
8mm - Internal thread length is 6mm.
9mm - Internal thread length is 7mm.
10mm - Internal thread length is 8mm.
20mm - Internal thread length is 8mm.
describe:
Sometimes you can't get the correct focal plane for focusing with your camera or eyepiece. You can use this teleconverter with any camera or eyepiece or with a variety of adapters. The M54*0.75 threads on both ends make it extremely versatile. Use this teleconverter to get the correct image ratio or to get the exact spacing you need for a focal reducer or field flattener. You can achieve the desired extension length by combining multiple teleconverters of different lengths.

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