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Outside Diameter Fit Range (Your optical tube OD needs to be within this range of fit)
the Bahtinov wheel can be closed as shown below allowing the focusing cap to be used as a dust cap for your scope
Vixen: R200SS
RCX 400 10”
They roll up easily into a convenient size for easy transportation to star parties and dark sky sites
Astrozap Focusing Cap Sky-Watcher Refractor Dew Shield List Outside Diameter Fit Range (YourUnlike a simple Hartman or Bahtinov mask, the Astrozap focusing cap is a multi purpose tool which allows for quick 'shutter like' operation. Just turn the wheel to the open position for focusing, and then turn it again to the closed position to keep the dust out, or to image dark frames with your CCD or DSLR camera. The inside of the focusing cap is lined with soft foam to protect the finish on your scope or lens shade. Three nylon thumbscrews tighten
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