I have a Bob 2A CaK filter. I also have a broadband CaK filter that Mark here from SolarChat was kind enough to post to me. I have not had a chance to try them, but I was wondering if there are any ERF's on Bob's site for CaK.
I do realise that if I use with a small refractor (I will use with refractors less than 80mm), that an ERF probably would not be necessary. But I would like to play around with a couple of "cheaper" filters (Less than the Baader blue CCD filter) that do not cost an arm and leg. Will only be using with imaging, and don't get me wrong, by cheap I don't mean I'm planning on not to be safe.
Just wondering what is out there that I am not up to date with?
Any Bob Ebay ERF filters for CaK?
- Merlin66
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Re: Any Bob Ebay ERF filters for CaK?
Brett,
I found Bob's offerings were all 25mm diameter.....
When Oliver gets his next stock of the TriErf, that would be an option.
I found Bob's offerings were all 25mm diameter.....
When Oliver gets his next stock of the TriErf, that would be an option.
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Re: Any Bob Ebay ERF filters for CaK?
Hi Brett, What sort of diameter are you looking at?
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Re: Any Bob Ebay ERF filters for CaK?
Any idea when oliver will get them?Merlin66 wrote: When Oliver gets his next stock of the TriErf, that would be an option.
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Re: Any Bob Ebay ERF filters for CaK?
No conformation as yet - hopefully soon.........
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
Re: Any Bob Ebay ERF filters for CaK?
Mark, I am planning on a dedicated 60mm f/15 telescope for CaK. But it would be nice to use it now and then in the 127mm f/7.5 refractor as well.