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Vixen Optics'40mm Extension Tube for 43mm Threaded Adapters adds 1.6" (40mm) of length to the optical path of telescopes with 43mm threaded adapters in place. This is often necessary for applications involving prime focus imaging, to place the image-receiving device at the right distance to achieve focus.
In the Box
Vixen Optics Extension Tube for 43mm Threaded Adapters - Adds 40mm of Path Length for Prime Focus Imaging Applications