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 Celestron Lens Shade/Dew Cap:
This product seems a bit mis-shapen when it arrives. Don't try to put it on the scope and affix it there. Just join the velcro strips and leave it to stand. It will assume a circular shape. One end is padded inside and fits snugly over the end of the scope and in my case corrects the back heavy imbalance of the tube.
So:
1.It is great value
2.It protects the corrector plate from dew
3.It protects from stray light
4.It is easy to affix and remove.
The only downside is that it is bulky if you leave it rolled up ready for use (which I do), but what the heck!
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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