AstroCaps are made to fit both your telescope ota and Astrozap aluminum dew shields.It's not just another dust cover - it's a multi-functional integrated wheel system which allows for quick 'shutter-like' operation.Triangles are the answer:Each AstroCap is shipped with one triangle wheel for quick focus. Triangles create diffraction spikes which makes it easier to focus.(No more trying to focus on three blobs using a round hole focusing cap.)Simply turn the thumbscrew to open and turn to close.No plastic plugs required.Optional wheels for checking collimation & off-axis viewing are available.AstroCaps are made from aluminum and powder-coated texture black.Wheels are made from ABS plastic and are designed for quick changeovers.No tools needed!
