About this product
Part Number: 2961700g
With the Sloan Digital Sky Survey (SDSS), a new era of photometry began in 2000. Since then the Sloan Photometry System is gaining more and more importance in professional astronomy. In the coming decades, it is expected that the Sloan system will also become more widespread in amateur circles.
In 2000, a new era in photometry began: with the Sloan Digital Sky Survey (SDSS), a 2.5 m telescope at Apache Point Observatory (New Mexico, USA) surveyed one third of the sky in five wavelengths. A camera with a total of thirty large CCD sensors with 2048×2048 pixels each was used, each in five rows of six sensors. In front of the sensors was a u'g'r'i'z' filter set for five non-overlapping wavelength windows around 355.1, 468.6, 616.6, 748.0 and 893.2 nm; light pollution such as the airglow at 558nm and the mercury line at 546 nm were masked out. This system was also used for the Pan-STARRS project; the broad data base of these two surveys makes them very well suited for calibrating images. Another advantage are the wider transmission windows, which allow fainter objects to be measured in a shorter time.
The new Baader SLOAN/SDSS (ugriz') photometric filters are now available according to SLOAN specification in 8 sizes:
1¼" / 31mm / 36mm / 2" / 50,4mm / 50x50mm / 65x65mm and 100x100mm
Even though the six Sloan filters have different characteristics when compared to the UBVRI filters, there are now the appropriate algorithms to compare the data with each other or to convert them into each other. Therefore, the Sloan photometry system is gaining more and more importance. At present, UBVRI filters still dominate in amateur circles, but Baader Planetarium not only offer unmounted Sloan filters for professional telescopes, but also in the sizes and mounts commonly used by amateurs. In the coming decades, it is expected that the Sloan system will also become more widespread in amateur circles, which is why Baader Planetarium's Sloan filters are also available in the common filter sizes for amateur telescopes as well as in the large format 100x100 mm. The SLOAN z' filter is currently not included in the scope of delivery, as its function can usually also be taken over by the UBVRI -I- filter.
The same technology is used for the Sloan filters as for the CMOS-optimized narrowband and LRGB filters. Here, too, the lifetime Life-Coat™ guarantee applies.
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