Feature: 1. Application: This adapter cylinder thread M42x0.75 is suitable for T2 mount lens of camera, and T2 adapter ring is suitable for to OM SLR camera. 2. Height Adjusting Valve: The height of eyepiece can be adjusted from 67mm to 80mm. Diameter regulating valve, the diameter of eyepiece can be adjusted from 41.5mm to 44.5mm. 3. Hollow Design: This T2 to OM adapter ring tube adopts hollow design, which does not affect the focusing wheel and the adjustment of the focusing hand wheel on both sides. 4. Scope of Use: This adapter tube is suitable for birdwatching spotting scope and SLR camera, which is helpful for visual photography. 5. Easy to Install: This photographic accessory is simple, practical and easy to install, made of aluminum alloy and can be used for a long time. Specification: Item Type: Spotting Scope Camera Adapter Tube Material: Aluminum Alloy Gross Weight: 186g / 6.6oz Thread: Male Thread M42x0.75mm Height Regulating Valve: adjustable eyepiece height: Approx.67-80mm / 2.6-3.1in Diameter Regulating Valve: adjustable eyepiece diameter: Approx.41.5-44.5mm / 1.6-1.8in Scope of Application: birdwatching lens SLR camera. Package List: 1 x Tube1 x Adapter Ring