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What are the advantages or disadvantages of 10, 15 and 30 Mm blocking filters used with a 90Mm Coronado telescope? — 1 Answer
by
Barney,
from CO, United States Asked on May 2, 2018
Coronado Blocking Filters for SolarMax Front Filters(5)
Answered by
Ethan C.,
Gear Expert,
from IL, United States,
on March 07, 2019
The advantage is that you protect your eyes from damage from viewing the sun, but the disadvantage is that the larger the filter (in mm), the more light and clarity you lose. The filter size you need depends on the focal length of the eyepiece you are using.
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