2" Filter Slot Adapters

Above is VSE's [reconstituted] aluminum, threaded 2" Filter Slot Adapter (FSA). If you only use filters occasionally, and can't justify [or afford] an expensive filter wheel, then VSE's FSA is the way to insert filters in your imaging train without having to remove any equipment. You can even stack [screw] them together to piggy-back filters. Just slide your filter into the slot and a spring plate holds your filter securely until you're ready to remove it. You remove your filter by simply pushing the ejection plunger on the bottom of the FSA. Filter insertion and removal is a one handed operation. Also included with your FSA is a stray light blocking insertion ring (pictured above right). When you're not using your filters, just insert the ring to block stray light from entering the slot. The 2-inch threaded FSA takes standard 2-inch (48mm) filters up to a thickness of 5/16" (0.3125"). The FSA is designed to take industry standard double sided, male/female threaded filters. The same type filter cell that screws onto the bottom of a 2" eyepiece, except instead of screwing them on, you just pop them in and out. Easy, fast and efficient! The threaded FSA adds slightly less than 1-inch to your profile. Even though this adapter is cut in half, there is no flexure from heavy, leveraged equipment loads. VSE guarantees zero flexure up to 10 lbs. The internal adapter walls are 1/4-inch thick aluminum, eliminating any possibility of flexure.

The threaded FSA has a standard 2"-24tpi male thread on one end, and a standard 2"-24tpi female thread on the other end (not shown in picture). This adapter's diameter and threads are the same as the visual back on Meade/Celestron Schmidt-Cassegrain telescopes (male 2" diameter, 24 threads per inch). This threaded FSA has the same physical dimensions and thread specifications as a standard Meade/Celestron focal reducer, except this adapter has a filter slot in the center of the housing, instead of a glass lens. This FSA is the same type as the built-in filter slot on the rear imaging port of the VP Sliders, and includes the stray light blocking insert ring noted above. Small packet air shipping in US is $7.

Item #FSAT, 2" Threaded Filter Slot Adapter, w/stray-light blocking insert ring: $129