Dennis wrote: ↑Thu May 25, 2023 9:48 pm Go for the f / 6.9 one. You want to achieve at least something like f30 at the etalon. Short focal length refractors are not a thing when it comes to contrasty h-alpha. f/35-40 is even better for the etalon performance.

Thanks a lot for the advice, Dennis! I really find it super helpful!

I'm considering purchasing an 81mm aperture refractor telescope to use with my Quark Chromosphere filter in order to achieve a wider field of view compared to my Sky Watcher Evostar 150. I have two telescopes in mind: the William Optics Zenithstar 81 (doublet) with an f6.9 focal ratio, and the Willi...

Hello everyone! I want to build a Newton telescope with a dealuminated primary mirror to photograph the sun in white light, I live in Argentina and due to the scarcity of materials and specialized skilled labor to build a mirror, it seemed like a good idea to buy a GSO 10" f4 Newton telescope (...

Dear Shadowchaser, I would presume that it would be on sale for the general public, you would need to buy direct from Baader. We got this expression of interest going to show Baader that if they produced a run they would have enough people who would buy it. It was an incentive. So order through you...

According to the statement of Mr Baader above he quotes "We will definitely not forget this inquiry and hope by end of this year latest, to being able to serve you and the group" so I don't think we are are at the end of this year yet :) Alexandra Hi Alexandra! I am interested in one of t...

A few years ago, Baader stopped making Astrosolar ND 3.8 in size larger than A4. I am afraid they are not planning any new batch, unless a huge number of solar observers ask for it ;-) I would try the A4 size on the C 9.25. Only a small part of the aperture would be limited to about 200 mm. So, you...

Hi everyone!! I currently have a Sky Watcher Maksutov 180 with a Baader Astrosolar OD3.8 filter and it gives me very good results for WL photography. I wanted to try the same thing with a Celestron Edge 9.25 to have more resolution, but the OD3.8 filters in the Edge 9.25 size have not been in stock ...

The other possibility is you are too hot, this is an easy test. Set the Quark up cold on the scope. Find the sun and watch on the computer screen as it heats up. As it heats up do you see the Sun come on band then go off band again? Do you have the dial setting correct first? test all the dial sett...

marktownley wrote: ↑Wed Feb 16, 2022 10:58 pm Sorry to hear this

Can you feel the filter heating up when you apply power?

Yes, the filter is hot, even the light turns green after a few minutes as if it works normally.

Hello! I have a problem with my DayStar Quark Chromosphere filter, I bought it a year ago and I used it a few times, generally, due to the seeing that I have over my location, I use my Coronado Solarmax II 90 much more. A few days ago I wanted to use it and the filter is completely off band, no matt...

If you have a more than okay Quark - the single stack Lunt will not show more details - but you can image the full disk. Side by side my 0.6 A Quantum and a Bresser 127mm f9 doblet was a little bit better on surface details and stunningly better on prominences... A very good Quark at the same meeti...

I would do as said by Mark and Alexandra. If you are happy with the Quark, go for the 150 mm f/8 and possibly a Baader ERF. Thanks Christian for your answer!! It seems like a good option to go for a doublet and use my Quark. One more question... What is the difference in image quality between a Lun...

Hello everyone! I want to buy a 150 mm aperture solar telescope, to photograph prominences and active regions in more detail. As I live in Argentina, with the restrictions that my country imposes on imports, I cannot fail in the choice of equipment, since it would be impossible to return or exchange...

Hello everyone!

I have a Coronado SolarMax II 90mm BF15 telescope and a ZWO 290 MM camera that works fine for details, but now I want to take pictures of the full disk. Which camera do you recommend me?

Thank you!

marktownley wrote: ↑Thu Aug 22, 2019 2:59 pm What about the other end of the diagonal?

It is also painted black

marktownley wrote: ↑Thu Aug 22, 2019 6:30 am Is the inside of the nosepiece bare metal on the bf15 with the 90?

The inside of the nosepiece is black painted metal.

Hi everyone!!! I recently changed my Coronado Solarmax II 60mm for a Coronado Solarmax II 90mm BF15. When I capture images with my ASI 290MM placed directly on the diagonal, I have no problems. But when I use a barlow lens or an extender, a reflection appears and I cannot remove it. What can cause t...