This is our standard 2X 1.25" Barlow lens with extreme broadband full multi-coatings and American machined parts. The black anodized insert tube has a safety groove and the black anodized eyepiece receptacle uses a brass compression ring. Stainless steel thumbscrew with knurled knob that is easier to control when using gloves. This Barlow is fully multi-coated, cemented, edge blackened 2 element lens system. This is a great way to boost power while preserving the eye relief of your lower powered eyepieces. We did not include a filter thread on our Barlows since it make much more sense to use the filter on the diagonal.
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Great service and great product!