AstroZap Focusing Cap for ETX 125
This focus cap does two jobs for your telescope. When you want to focus the image during astrophotography sessions, just turn the center knob to "Open" to reveal a trio of off-axis masks that will get the job done. This position allows the focusing cap to operate the same as a simple Bahtinov mask. The Astrozap Focus Cap doesn't stop working there. Rotate the wheel again to place the cap in the "Closed" position, and either take dark frames or use it as you would any dust cap.
This Astrozap Focusing Cap is strong and aesthetically pleasing as it is made from lightweight aluminum and powder-coated black. For installation: three thumbscrews hold the Focusing Cap firmly in place.
The AstroZap Focusing Cap for ETX 125 will fit 136mm-146mm optical tubes.