This adapter lets you use a standard 1.25" astronomy filter in a chain of T / T2 threaded accessories. Has a male T / T2 thread on one side and a female T / T2 thread on the other side. Also has a 1.25" female filter thread (M28.5x0.6) all the way through in the middle.
Very low profile. Total thickness = 4.5mm (0.18"). Male T thread length = approx. 1mm (0.04"); Female T thread length = approx. 1mm (0.04"); Female M28.5 thread length = 4.5mm (0.18"). Maximum outside diameter = 45mm (1.77"). Weight = 0.15oz. Made of black anodized aluminum.Blue Fireball part number: T-10
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