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Posts Tagged 'baader'
New CMOS-optimised line filters from Baader
July 1 2021, Stefan Taube
The manufacturer Baader presents new filters for astrophotography in the spectral lines H-alpha, OIII and SII.
- Narrowband filters for aperture ratios f/10 to f/3.5
- f/2 highspeed filters for aperture ratios f/3.4 to f/1.8
- Ultra-narrowband filters for aperture ratios f/10 to f/3.5
- f/2 ultra-highspeed filters for aperture ratios f/3.4 to f/1.8
The half-width of the narrowband filters is 6.5 nanometres, and for the ultra-narrowband it is as little as 3.5 to 4 nanometres. The f/2 filters are optimised for very fast astrographs such as Celestron’s RASA optics.
All filters are available in standard sizes:
With a line filter, astrophotography of luminous nebulae is possible even under a light-polluted city sky! These filters only allow those wavelenghts of light in which the selected celestial object shines to fall on the camera sensor. All other wavelengths are blocked. This produces high-contrast images of planetary nebulae, supernovae remnants and star-forming regions.
Three types of line filters are used in astrophotography, each of which is transparent to the brightest spectral lines of oxygen, sulphur or hydrogen atoms. Depending on the astronomical object, a single filter may be enough for a spectacular image. Combining three shots, each taken through a line filter, creates an ideal result.
The new generation of Baader CMOS-optimised filters is characterised by, among other things:
- Reflex-Blocker™ coatings, for maximum insensitivity to retro-reflection from adjacent auxiliary optics, even under the most adverse conditions.
- FWHM on each filter category carefully designed to allow for 1:1:1 exposures, matched for typical CMOS quantum efficiency and S/N ratio.
- Blackened edges all around, with filter-lead-side-indicator in the form of a black frontside outer rim, to additionally eliminate any reflections due to light falling onto the edges of a filter.
- Each filter is coated individually, with sealed coating edges.
- Life-Coat™: Hard coatings to enable a non-aging coating for life – even in the most adverse environments.
You can find all the new filters here in the shop.
Observe the night sky with Celestron SkyMaster binoculars!
June 4 2018, Stefan Taube
For many observers is not a telescope, but rather a pair of binoculars that is used as the main optical instrument for exploring the night sky. That is, after all, only logical as real nature lovers are already equipped with binoculars.
Observing the night sky with the binoculars is more than just a compromise – binoculars, with their wide field of view and using both eyes, do have certain advantages over a telescope. And as binoculars are always close at hand in the truest sense of the expression, they follow the golden rule of observing the night sky – the best optical instruments are the ones that are used the most.
The SkyMaster series from the American brand Celestron are extremely popular binoculars often chosen for astronomical observing. These astronautically optimized binoculars offer a generous aperture at a great price.
For successfully getting started observing the night sky with binoculars we recommend the SkyMaster 15×70 SkySurfer set. You get it for the very affordable set price of only 133 Euros!
In addition to the binoculars, you also receive a SkySurfer III red-dot finder from Baader, which will help you to orientate yourself in the night sky. The red dot finder projects a red dot onto a transparent window. This lets you see which part of the night sky the binoculars are pointing at and lets you orient yourself using a star chart.
The set also includes is the particularly sturdy Stronghold-Bino tripod adapter from Baader. Unlike the usual adapters made of plastic or aluminium this adapter is made of steel, ensuring that your binoculars are held really firmly and safely on the tripod.
This offer is valid until August 31, 2018. And if you buy the Celestron SkyMaster 15×70 SkySurfer Binoculars set before 27.07.2018, you will be able to observe the lunar eclipse on this date. So make sure you grab yours in time!