Canon 600mm F4 super telephoto lens with Canon full spectrum, full frame EOS 6D DSLR. In the flash shoe of the camera is a finder scope. The mount is a Sky Watcher EQ6-R Pro. I have a Canon 1.4x teleconverter (extender) for this lens which is not shown here. That converts the lens to 840mm FL at F5.6. The diameter of the objective of this telephoto lens is rather large, being 150mm or 6 inches. It is extremely apochromatic and stars are sharp everywhere in the field.
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