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  • Baader set filtri fotometrici UBVRI 50x50mm Baader set filtri fotometrici UBVRI 50x50mm

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Baader UBVRI 50x50mm photometric filter set

Product code: BP2459444

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Quick Overview

Modern telescopes can be used also to record images and obtain scientifically useful data that can be used for research purposes: this is photometry! Baader UBVRI 50x50mm photometric filter set adheres to the widely used astronomical Johnson/Bessel filter transmission specification and allows you to record photometric observations with your imaging equipment on many celestial objects like variable stars or minor planets.

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Regular Price: €1,769.00

Special Price €1,722.00

22% tax incl
if you pay by bank transfer €1,670.34


Baader 4 mm thick UBVRI filters feature a proprietary design that strictly adheres to the classic Johnson/Bessel transmission specification. Unlike the classic construction that regularly has a thickness of 5mm or more, the Baader-filters are made of dielectric layers as well as absorption glasses. This allows for a smaller filter thickness of 4 mm. The original stack of pure colored glass had a thickness of 5 or 6 mm and would be too thick and too heavy for modern filter wheels.



Baader UBVRI 50x50mm photometric filter set



In the old days UBVIR-filters were used for photodetectors and no one would care if the huge stack of cemented absorption glasses would cause havoc in terms of inherent internal reflections. Our method of combining dielectric coatings with a combination of short pass and long pass filters does provide for perfect off-band blocking into the far ends of the spectrum. This steep off-band-blocking would not be possible with pure dielectric layers over such a large transmission range.

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