Hi all.
I have what I believe is an energy rejection filter for a TeleVue NP101 refractor. There is black metal disk that screws into the front end of the dew shield. There is a smaller diameter "hole" in the center of that disk. It has a darkish red glass filter? in there. And there is a another threaded black metal disk that screws over that should one want to cover it.
So who made this?
Thanks very much for any input!
Old? Solar Energy Rejection Filter for Televue NP101
- marktownley
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Re: Old? Solar Energy Rejection Filter for Televue NP101
Welcome to the forum!
Sounds like an ERF, probably for a Daystar...
Are you looking to do something with it?
Sounds like an ERF, probably for a Daystar...
Are you looking to do something with it?
http://brierleyhillsolar.blogspot.co.uk/
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