Quote:
Originally Posted by hobbit
Can anyone recommend a hydrogen alpha solar filter to add onto a 120x900mm refractor?
Thanks.
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You could look at the Daystar Quark eyepiece, which is about the cheapest option for a Hydrogen Alpha filter. They will work on refractors from f/4 to f/9. You will also need a Energy Reduction Filter, of which there are two types, a 2" IR/UV Cut off filter that fits to a 2" diagonal or a full aperture. The full aperture isn't cheap though and is about USD 750. I am currently waiting on a full aperture filter for my AT65EDQ and that was USD 350.
The quark are USD 995, which will make around AUD 1200 + freight, clearance and tax. The price will fluctuate due to the dollar conversion. The next cheapest filter from Daystar is USD 2100.
There are waiting times for these items, although OPT had some stock when I ordered two weeks ago.
See the following links:
http://www.icstars.com/Store/daystar...ers/quark.html
http://www.icstars.com/Store/daystar...n-filters.html
http://www.daystarfilters.com/downlo...FOrderForm.pdf
I have just received my Quark eyepieces, both the Prominence and Chromosphere models, but haven't had a chance to try them yet. Hopefully, I will get a chance to try them out this weekend.
Cheers Peter