s******o
发帖数: 298 | 1 by Mike Weasner
I purchased this filter from Scopetronix. I decided that after nearly 40 years
of looking at the Moon without a filter I should give one a try. The Moon
filter attaches to almost any 1-1/4" eyepiece. It is a neutral density filter,
meaning there is no color shift, that reduces the amount of light passing
through.
My first night out with it the Moon was about 4 days old (crescent). With the
standard 26mm eyepiece on the ETX-90RA the Moon without a filter was
bright but not uncomf |
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