Astro-Physics QRBASES-A Base for Quick Release Finder Brackets, Small Radius
This base was specifically designed to fit the predrilled holes on the smaller 4.7" tube diameter of the 130mm f6.3 Gran Turismo, though it may also fit on other instruments with small tube diameters. The 130 Gran Turismo has only one set of finder bracket holes since the tube rotates easily if you wish to change the position of the finder.
The dovetail design of this base accepts these items:
10 x 60 Quick Release Finder Bracket (S1060QRM)
8 x 50 Quick Release Finder Bracket (S850QRM)
Male Dovetail Base (A3251-B and earlier versions) along with whatever accessory you have attached
Modified TeleVue StarBeam (STARFMD) or modified Qwik Point (QWIKMD) finder, which already include our part #A3251-B male dovetail piece
Although we assemble the bases for right-handed use, you can easily move the stop screw to the opposite position and rotate 180° for left-handed people.
The base is small enough that you can leave it attached to your scope. When you place it into the case, position the scope so that the base is in a corner position. Simply loosen the screws and slide the finder assembly out. You may wish to purchase an extra base to attach to other telescopes so that you can swap your finder easily from one instrument to another. If your scope has multiple finder bracket holes, you can either have multiple types of finders on your scope or have the ability to quickly switch your finder from one side of the scope to another.
Please note that this base was designed to fit on mounting surfaces with diameters less than 6 ". If you have a larger instrument, please refer to the Base for Quick Release Bracket, shown above. Note that the dovetail slot is the same for both of these bases.
The mounting hole spacing is approximately 1 3/8” (34.9 mm) side-to-side and uses 10-32 screws for attachment. The length is 1.35" (34.3 mm) .
Weight: 2.1 oz. (0.07 kg)