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AstroZap Focusing Cap for 9" SCT's - AZ-409


AstroZap Focus Cap for 9" SCT's

This AstroZap Focus Cap does two jobs for your telescope. When you want help focusing the image during CCD or DSLR photography sessions, just turn the center knob to the "Open" position to reveal a trio of off-axis masks. This is just like a simple Bahtinov mask.The cap doesn't stop there. For its second job, just rotate the center knob to the "Closed" position. This lets you either take dark frames or use it as you would any dust cap to protect your optics.

This Astrozap Focusing Cap is made from lightweight aluminum and powder-coated black; it is both strong and nice-looking and will be a durable and extremely useful astronomical accessory for years to come. For installation, no plastic plugs or tools are needed. Three thumbscrews hold the Focusing Cap firmly in place.

The AZ-409 Focus Cap will fit telescopes with outside diameters from 247mm-266mm. This measurement is normally that of a 9" SCT, but please measure your own telescope before ordering.