Quote:
Originally Posted by tornado33
Thanks. Yes the Eos Ra has an IR cut filter, it extends into the H Alpha band like a modded DSLR but has a white balance to give normal daylight colours, making it suitable for non astro photography as well.
The duo narrowband filter works OK, though I wish I could get one that does S2 and H beta as well. I don't think such 4 band filters are available as a clip in filter. I cannot use the 2 inch screw on type as it is ahead of the guider pick off prism, and it would make guide stars impossible to find.
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Maybe a guide scope in lieu of OAG might allow some more flexibility with filters especially in Narrowband for emission nebula
I use guide scopes with my 8” and 10” Newts CF with no issue at all
8” guides around 0.40 to 0.50 total ( FL 1050mm ) on stable nights
10” guides around 0.50 to 0.60 total ( FL 1280mm ) on stable nights
2600MC camera use a 2” filter drawer
2600MM camera uses a 7x2” filter wheel
Options galore for both cameras
Cheers
M