That is what i said
FROM Daystar Instruments
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On Wed, Feb 27, 2019 at 10:46 PM Tiffany Messerschmidt <tiffany@daystarinstruments.com> wrote:
Jeremy,
It is correct to say a front mount ERF is not needed with a 120mm refractor.
You only need a blocking filter before the diagonal and do not need any front mounted one on scopes up to and including 120mm as long as it is not an oil spaced doublet/triplet
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