[Gadget4x4 (Peter)]

Clearing out excess gear.

I purchased 40inches x 24inches (1016mm x 600mm) of 0.04" (1mm) thick sheet flock board to use on the in a Celetron 11" SCT to remove all excess stray light entering the tube, but sold the SCT before I could use it.
Can be cut to size to suit a tube less than 11".
$100
Still in box and rolled as supplied.
Comes with instructions.
Hard to photograph as it has no reflection inside.

Flockboard is a good material choice for the lining of solid-tube telescopes.
It’s stiff enough to be self-supportive when rolled up, but still easy to cut with scissors or a utility knife.
The light absorbing side is specifically engineered as a light trap surface (unlike some flocked papers that are just for decorative texturing).
It is designed to have almost zero reflectivity at all angles of viewing, and is not damaged by normal dew and moisture.
It will not shed fibers onto your optical surfaces under normal use.
Flockboard springs out against the tube wall, and does not require adhesives or tapes in most applications.