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Filter For Ethos


estwing

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OIII filter, and I have heard of people successfully using OIII filters with a bog-standard sub-centimetre naked eyeball, so IMHO this advice has no firm basis -. There is no lower aperture limit for using an OIII filter.

My advice is try it and see.

Andrew

And very good advice it is too. I have often used my O-III filter to successfully observe the north American nebula with my eye alone.

Its whether or not you like the aggressiveness of the O-III or the more gentle approach of the UHC. aperture doesn't come into it IMO

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