John from Leeds e-mailed me with a suggestion for my Celestron NexStar 11 GPS telescope. Maybe others out there are in need of a dew shield to stop their corrector plate fogging up during observing sessions:
Buy a dark coloured camping mat from any outdoor shop and a packet of
velcro and you can make an excellent dew shield. It may not look as
posh as a bought one but it's as good or better at a fraction of the
cost. You can make it any size you like and it is light so it will
not unbalance your tube.
Happy New Year
John (Leeds England)