Can you observe through glass?

[jjohnson3803]

When the windchill here gets down to -10*F (-23*C), I do observe through glass.  Star clusters and doubles aren't pristine, but they don't look completely horrible.  The moon is less tolerant of extra glass between the objective and the sky.

IIRC, a research observatory (University of Michigan?) tried observing through optical grade Mylar and the results were decent.  No idea of the cost or if the stuff is even manufactured anymore.

Edited May 31, 2023 by jjohnson3803

[Louis D]

4 hours ago, jjohnson3803 said:

IIRC, a research observatory (University of Michigan?) tried observing through optical grade Mylar and the results were decent.  No idea of the cost or if the stuff is even manufactured anymore.

Sounds a bit like the aforementioned Baader TurboFilm.