The most important emission lines from nebulas are shown in orange. The blue line shows the transmission of the filter. The transmission in % is plotted on the vertical axis. At 656nm is the famous "H-Alpha" emission line of hydrogen. 400nm is deep blue, at 520nm the human eye senses green and at 600nm red. The horizontal axis is the Wavelength in Nanometers (nm). Transmission losses and chromatic distortions, which arise with other filters, only occur with Astronomik filters when they are used with extremely bright aperture ratios 1:2 and higher!Īstronomik's UHC filters use very high quality glass and optical coatings so the telescope's native performance is not degraded. Optimised for use with telescope f-ratios f/4 to f/15. The Astronomik UHC filters’ remarkably high light transmission improves views of deep-sky-objects, even when used with smaller telescope apertures! (I.e. Supplied in a high-quality, long lasting, filter box. Diffraction limited - the optical performance of your telescope will not be reduced. Not sensitive to high humidity or ageing effects. Ideal all-round deep sky filter, even for small telescopes. Nearly 100% transmission of O-III & H-beta. ↳ Challenges Q&A and target suggestions. TSS Photo of the Day & Viewing Report of the Day. ↳ Electronically Assisted Astronomy (EAA). ↳ Remote Imaging - Images and Discussions. I've not had a prism diagonal before, so I'm looking forward to the new experience! If it gets to the end of the month, and I receive the eyepiece holder coming from China, and they are still not in stock, at least I know I can purchase the two Baader items. I signed up to get a message when they are back in stock. I looked on the Agena Astro web site, and they have a FAQ with exactly the question I would ask, and their answer is, if they do not show any message beside the "Out of Stock" indicator, then they don't know when the item will be back in stock. Took me a few years and a few diagonals to arrive to that one, but it delivers nicely. You will not be disappointed with Baader prism. You may want to give Agena a call, it could be just a few days before they restock on the Blue Fireball. I am using the Blue Fireball adapter but Baader's SCT adapter you referred will work to. So, my scope is visually fine, but I have a bunch of disappointments with the visual back and diagonal.ĭoes anyone else also have a C6? Have you been using the same visual back and diagonal? Did I simply get the cheap stuff because Celestron is trying to hold the price down? Any suggestions for possible upgrades would be appreciated. 
I would really like to have one of those inner bands that the set screws tighten against, and the band tightens around the eyepiece. The diagonal has better set screws to capture the eyepiece you install, but, like the visual back, the set screws are all there is. That, combined with the wimpy set screws in the visual back, and I'm constantly fearful that the diagonal will slide right our of the visual back.ģ. The end that sticks into the visual back has a completely smooth barrel.
The supplied diagonal is a disappointment for me. I would really like to have one of those inner bands that the set screws tighten against, and the band tightens around the diagonal.Ģ. On top of that, the set screws are all there is. The thumb screws have tiny heads, and it seems pretty easy to not get them tight enough. The supplied visual back seems mediocre at best. It took a bit of work, but I managed to find the Moon, and the setup is currently tracking out in my driveway.Ī few observations to share - and I'd like your thoughts, as well:ġ. Even with the 40mm eyepiece, of course I wasn't on the Moon any more with the more narrow FOV. I first got my mount all aligned with my TV-85 and a 40mm Plossl eyepiece, and then switched over to the C6.
So today, I got the OTA out of storage to give it a try for some daytime Moon viewing. Then, after Christmas, and practically up to now, we have had the most dreary, cold, snowy, rainy, whatever you can think of days/nights (except when I was totally tied up with something else. Well, I found out that it wasn't a "sale" but apparently their normal price. Back before last Christmas, I purchased a Celestron C6 OTA from Highpoint Scientific because their price was outstanding, and I was afraid that the "sale" would shortly disappear.
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