Deep-Sky & CCD Narrowband-Filters

Deep-Sky Filters for visual and photographic use:

• UHC
• O III

CCD Narrowband-Filters:

• UHC
• O III
• H-alpha
• H-beta
• S II

Never use any Deep-Sky H-alpha filter for solar observation!

• Large and growing selection of premium Baader Planetarium astronomical filters. These filters are the result of many years of development and experience in the use and production of optics using the very latest coating technologies. Baader Planetarium filters incorporate features that result in performance and robustness not present in any other competing filter, yet at very reasonable prices.
• Planoptically polished (1/4 Lambda)
• Coatings are professionally applied here in Germany by the most sophisticated equipment available today, ensuring high consistency for bandpass centering, transmission, and out of band blocking. The anti-reflection coatings are designed to prevent halos and balanced to prevent physical deformation of the optically flat substrates. The ultra-hard ionbeam deposition ensures the coatings will never degrade from use or normal cleaning. Each Baader Planetarium filter is coated individually, permanently sealing the coating edges, in order to guarantee lifetime coating durability and uniformity.
• LPFC = Low Profile Filter Cell (effective height 6mm)

Legend:

• 1¼" = Filterthread M28.5mm
• 2" = Filterthread M48mm
• 36mm, 38mm (glass thickness: each 2mm), 50.4mm, 50.8mm (glass thickness: 3mm) = round, unmounted
• 50x50mm, 65x65mm (glass thickness: each 3mm) = square, unmounted
• nm = Nanometer (bandwidth/FWHM)

Note:
The preferred oriention of the filter is to have the highest reflectivity side facing skyward.