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I am currently using an 8" SCT telescope with a few Baader filters to image the sun's surface but after much reading
I am now considering purchasing a dedicated solar telescope to expand my viewing.
However, having found an article that led me to your page, I would like to know whether such filter
(Solar Spectrum Observer Series 1,5 or similar model) would work with my SCT.
I already have your OD 3.8 film which I use when imaging (not viewing).
I am now considering purchasing a dedicated solar telescope to expand my viewing.
However, having found an article that led me to your page, I would like to know whether such filter
(Solar Spectrum Observer Series 1,5 or similar model) would work with my SCT.
I already have your OD 3.8 film which I use when imaging (not viewing).
Question by: Philippe Fossier on Jun 1, 2023 10:27:00 PM | 1 Answer(s)
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Details
First Class H-alpha Solar Filters by SolarSpectrum
A SolarSpectrum filter transforms almost any telescope into a high-end H-α telescope with appropriate accessories. The filter design is optimized for observatories and amateurs who want to use the full aperture and resolution of large telescopes for solar observation and plan more than just an occasional view at H-alpha.
The filters have no central obstruction and are actively heated. This means that the filter does not need to be readjusted during the course of the day - ideal for long-term observations, time-lapse photography or public relations work.Further information can be found on our detailed Blogpost:
Related Articles
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First Class H-alpha Solar Filters by SolarSpectrum
Temperature controlled H-alpha-filters (lambda = 656,3 nm) with electronic temperature control (combined heating and cooling!) All SolarSpectrum H-alpha filters at a glance --> Such professional filters show an unsurpassed abundance of details by using the full aperture of the telescope and are thus the first choice for semi-professional observers / photographers as well as for scientific use. Solar Spectrum H-Alpha Filters give you an incomparable view of our Sun's eruptive surface. The SolarSpectrum filters follow the classical design and are placed behind the telescope in the focuser (although this requires a D-ERF energy rejection filter in front of the lens). In combination with a telecentric system tuned to the focal length of the telescopic, between 2/3s of the aperture and the full aperture of the telescope can be used with most refractors and SC telescopes, depending on the telescope's f/ratio! The telecentric system parallels the beam of light and extends the focal ratio of the telescope to the mandatory value of about 1:30. Other narrow-band H-alpha filters are placed in front of the telescope lens. They are avaiable at affordable prices only up to 90mm diameter. For larger telescopes, the aperture of the telescope is stopped down by the filter....
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Solar imaging with the TEC 140 f/7 Fluorite Apochromat
On 2 June 2021, our customer Alan Jadanić sent us these amazing solar images taken with the TEC APO 140 f/7 Fluorite Apochromat (#1351005 , € 10680,-) . He used our kam unser D-ERF Energy rejection filter 135mm, a Solar Spectrum H-alpha Filter and the 2" Research Grade TZ-3 Telecentric System (3x focal length) (#2459257 , € 445,-) . Thank you! We would like to empahasise the multifunctional usability of the TEC APO 140 FL for DeepSky, visual observations and H-alpha. This optic can really be used day and night and is therefore a real all-rounder. Dear Mr. Baader, I have spent a few days with the TEC 140FL and a Solar Spectrum RG38 0,5Å filter and I must say that it is a very good filter both for visual observations and photography. The telescope for itself is an exceptional piece of astronomical equipment and with an excellent sharpness. With an ASTF 140 solar filter for white light, you can see the sunspots perfectly and even solar granulation is clearly visible. The FeatherTouch 3545 focuser is probably the best focuser you can find on the market and it comes as a standard with TEC 140FL As for the SolarSpectrum H-alpha...
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Tips for Choosing an Energy Rejection Filter for H-alpha-Observations
The purpose of an Energy Rejection Filter is to prevent as much solar energy as possible from entering the telescope in the first place and thus avoid excessive heating of the etalon of an H-alpha filter. This is done most effectively by a filter in front of the telescope. At the same time, this prevents the air in the tube from heating up - the telescope remains close to the ambient temperature, and there are no air turbulences inside of the OTA due to temperature differences. If we look at the solar spectrum, it becomes clear that such a filter must primarily block visible light. Ideally, it reflects the solar energy energy instead of absorbing it and and does not heat itself up in the process as well - that's why these filters are called Energy Rejection Filters (ERF for short). Since it is occasionally asked: A Herschel wedge or a white-light front-filter cannot be used as an ERF because it also darkens the H-alpha line. In H-alpha, the sun is far less bright than in white light, so there would be practically no light left to observe. There are usually three types of filters mentioned, when Energy Rejection...
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An experience report on the new Baader Telecentric System TZ-3 and the Research Grade (RG) Telecompressor (TC) 0.4
An experience and observation report on the new Baader Telecentric System TZ-3 and the Research Grade (RG) Telecompressor (TC) 0.4 for solar observation in the H-alpha light with SolarSpectrum filters download the complete review (pdf) Introduction Successful H-alpha-observations of the sun with narrow-band line filters from the manufacturers “SolarSpectrum” and / or "DayStar" require an almost parallel beam of light with a focal ratio of approx. f/30 directly in front of the filter, otherwise the filter will not work properly. This is not so easy with today's fast optical systems, which work around f/7. Such an opening ratio can be achieved either by masking (reducing) the front lens opening or by parallizing the optical beam with a "telecentric system" (TZ). * TZ: See also the supplement at the end of the report. My "solar telescope" is an AstroPhysics refractor with an aperture of 155mm and a focal length of 1.085mm, the aperture ratio in the prime focus is f/7. In order to use the filter without extending the focal length, the telescope's aperture would have to be reduced to approx. 35mm in order to realize the optimum f/30 focal ratio. It is clear that this is highly unsatisfactory – the resolution detail...
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