Hi to all
It's the first time I write on SolarChat but I've always found al lot of useful information on that pages. So, just a question: I use a WilliamOptics FLT132 with a full aperture Baader D-ERF for the H-Alpha and a Baader cool-ceramic for the other filters. Now I'm using a lunt CaK module but I'm not sure I can use it with the cool-ceramic (back focus, filtering etc.) and the Lunt suggest not to use the CaK module with a diameter larger than 100mm.
What could be used as full aperture ERF in front of the lens or internal as sub-aperture before the CaK module?
I see that Altair has multiband ERF filter like Baader for its SCT etc, but I'd like not to replace the D-ERF I already have also to separate Ha and CaK band...
I'm using the telescope at full aperture but I don't want to damage it, so alternatives are internal/front ERF or diaphragm it.
Thank you for your suggestion
Sergio
CaK ERF filter for Lunt module
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Re: CaK ERF filter for Lunt module
Hi Sergio,
Welcome to the forum. I would suggest stopping the scope down to 90m to use with the CaK module. At full aperture the scope will be full of spherical aberration at CaK wavelengths. 90mm will give significantly better results.
Mark
Welcome to the forum. I would suggest stopping the scope down to 90m to use with the CaK module. At full aperture the scope will be full of spherical aberration at CaK wavelengths. 90mm will give significantly better results.
Mark
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Re: CaK ERF filter for Lunt module
Yes I think it could be a good solution to reduce the aperture of the lens also to balance my local seeing.
Thank you.
Thank you.