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100-120mm decent refractor for solar use

kirkster501
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Peter Drew

Peter Drew

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Posted

I don't see how objectives can be at risk from using a Quark with or without an ERF.  At the position of a Quark the reflected focal point would only be in front of the filterby the amount that the filter was inside the focus.  The objective would be only at ambient sunshine temperature at most.    🙂

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Steve Clay
Steve Clay

This is all based on advice from daystar, here and solarchat forum. I'd researched the options on Ha for quite a while. The light is not focused when it hits the 35nm Ha filter. This first filter reje

Zakalwe
Zakalwe

I'd trust the word of the guy who made the scope. Daystar specifically do not recommend using an oil spaced refractor without a ERF, but this may be ass-covering?  http://www.daystarfilters.com/i

Merlin66
Merlin66

I use my Genesis 4" f5 with a Baader Cool Herschel wedge for solar white light imaging. It's an urban myth that Petzval scopes can't safely be used for solar work. I have it in writing from

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