This tube of approximately the same diameter as your telescope tube reduces the amount of dew that builds up on the corrector plate. It also serves as a lens shade, preventing stray light from falling upon the corrector plate and greatly improving contrast.
This shade is manufactured of rugged, soft Foamex plastic. It can be stowed away flat after usage. Celestron employs a thicker material that won't crack as easily as other manufacturer's efforts, with sewing instead of inexpensive glue for a longer service life.
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Comments about Lens Shade/Dew Cap for the Celestron C9.25 & Other 9.25" Schmidt-Cassegrain Telescopes:
I would have given the shade Five Stars except it appears the shade is a hair too big causing you to overlap the velcro material so far that you are almost running out of velcro. That causes the end of the overlapped section to stick up vs. laying flat and following the diameter. Other than that, this is a good product.
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This item is usually Drop Shipped from the MFR/Distributor within 7-10 days (subject to availability). Your order will be charged at the time of placing the order with the MFR