Dob Material

Hello,

What is the black material that is normally used for the "tube" for the upper cage (the part that supports the secondary and focuser) in large dobs? Where can it be purchased and how much does it cost?

Thanks.

Hi Scott,

The material is called Kydex. It comes in several thicknesses. The thinner sheets work best, perhaps someone here can tell you the actual thickness. It can be purchased from plastics suppliers. Also, telescope makers sometimes offer it on AM when they have an excess of it. It comes in 4'x8' sheets and ran about $60.00/sheet the last time I purchased it.

****Addendum....

I just found an old receipt ....the thickness I used was .028" and it was 71.00 (in 1998) total.

Hope this helps!
Steve