Feature: 1. 2 inch fine tuning high precision focuser planetary photography focusing for 1.25 inch CCD astronomical shooting. 2. CCD terminal is 1.25 inch and M42 interface, primary mirror terminal interface: 2 inch, with M48 filter ring. 3. 2 inch interface focusing seat, single speed and double speed is ok, focusing distance is greater than 55MM. 4. C8 / SC8 SC925 / C925, C11 / SC11 focuser primary mirror, can via 2 inch SCT interface and this product into the external focusing. 5. Made of high quality aluminium alloy material, sturdy, durable and long service life. Specification: Condition: 100% Brand New Item Type: Focuser Material: Aluminium Alloy Color: As Pictures Shown Quantity: 1PCS Weight: Approx. 157g Minimum Distance: Approx. 55mm/2.17inchMaximum Distance: Approx. 75mm/3.0inch Usage: 1. Focusing to 95% accuracy, then lock the focus 2. Use this, fine regulating, and record, find the best focusing distance, and then lock the focus. 3. It is better to use with fish bone focusing 4. After several basic operations, the influence of different temperatures on the range of the temperature difference value of the focus can be recorded. Package List: 1 x Focuser Note: Can be saved shooting the planet when the 2 inch extension barrel, has been focusing 55MM stroke instead.