Hutech Astronomical Products
Equipment for the Serious Amateur Astronomer

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This is an M57 series extension tube with integral dovetail mounting block in various applications such as adding a finder ("red dot" non-magnifiying, or magnifying) or mounting in a Borg fork mount as illustrated below:

Part #7517 - $69.00
DZ-2, M57 Tube with Mounting Bracket
2017-09-11