8400mm focal legth because the Quark has a built in 4.2x telecentric system. The resulting magnification
is very high, visually and photographically. Furthermore the Quark has a small aperture wich limits
the field diameter and does not allow to use long focal lenght eyepieces and large sensor CCD/CMOS sensors.
Size matters – even for solar observing!
There are many small, nice telescopes available which are great for a quick look at the sun in H-alpha or CaK, but who wants to observe always only with a "finderscope"? To see faint details, you need aperture and focal length. The groundbreaking Baader Triband-SCTs have got the energy rejection filter (ERF) – which is necessary for the SolarSpectrum CaK and H-alpha filters – already integrated into the Schmidt corrector plate. Especially in IR, the Triband Schmidt corrector is blocked down to 1450nm, so that the telescope will not heat up. So, you do not need an additional large and precisely polished ERF, and you can use the full optical quality of the Schmidt corrector. Additional rear-ventilated heat shields in front of tube and secondary mirror also keep the tube from heating up by the sun's radiation. This way, you can use the full resolution which is available at your location. With videography it is possible to achieve extremely high-resolution detail images of the sun. And you can do this at three wavelengths – not only in H-alpha!
The system is also great for visual observations – the sun will impress you more than ever in those moments when the seeing is good. Please note that a Triband SCT is no grab-and-go-telescope: Smaller telescope with less magnification will show nice images even at poorer seeing conditions, but a high-end telescope which pushes everything to its limits also requires a proper location. Make sure that your surroundings don't cause bad local seeing – only then you can take the telescope to its limits! The Triband-SCTs are based on Celestron's Schmidt-Cassegrains, a well-tried and reliable no-frills telescope system.
Unlike pure H-alpha-telescopes, you can use the Triband-SCT even at night: The coating is permeable for CaK, H-Beta,O-III, H-alpha and S-II, so that you can use the telescope fully for narrowband- or Ultra UHC-photography – be it with the original f/10, at night with a reducer at f/7 or even with a Hyperstar-system at f/2. You can even use UV-filters (Baader U-Venus-filter) or IR-pass-filters and achieve a surprisingly good contrast. The SC optical system suffers much less from chromatic aberration over a much broader spectral range than the best apochromatic lens telescopes. This makes the Baader-Triband-Schmidt-Cassegrains the most versatile CaK and H-alpha-telescopes on the market.
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