Standard 48 mm / M48 x 0.75 male thread on one side to connect to diagonal body
Glossy black anodized finish outside; painted flat black and grooved inside for maximum contrast
The female thread M48x0.75 at the rear end to accept 2 inch astronomy filters
Improve Focusing Problem: The extension tube has a M48x0.75 interior thread and a M48x0.75 exterior thread; elegantly solves the spacing problems in astrophotography and improve a series of focusing problems
Variable Combination: The required spacing can be achieved by combining several extenders of differing lengths; Use this extension tube for getting the correct image scale or the exact spacing required for reducers or field flatteners