Baader Calcium GEN-II 1.25 Filter (SKU: 2961590) all astro filters opinie

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Baader Calcium GEN-II 1.25" calcium filter (Baader Planetarium, SKU: 2961590) is a narrowband solar filter intended exclusively for imaging the Sun with a camera. It works in the calcium CaK line at 394 nm, allowing the transition region between the photosphere and the lower chromosphere to be recorded. In addition to structures known from white-light observation, such as sunspots, it allows imaging of the chromospheric network, supergranulation cells and Ellerman Bombs.

Key features

• filter for imaging the Sun in the calcium CaK band at 394 nm
• intended exclusively for camera use; not suitable for visual observation
• requires an additional solar filter in front of the telescope or a suitable configuration with a Herschel prism
• FWHM bandwidth of 5 nm; no need to use a double-stack configuration
• optimized for CMOS cameras, especially monochrome cameras
• Reflex-Blocker™ coatings reducing glare and reflections
• Life-Coat™ coatings with sealed edges for high durability
• blackened edges and telescope-side marking in the form of a black ring
• low-profile LPFC cell with a screwed-in height of 6 mm, compatible with filter wheels and filter drawer

Kit contents

• Baader Calcium GEN-II 1.25" calcium filter in mounted cell
• Baader AstroSolar® Photo Film OD 3.8 sheet, 200 × 290 mm

Technical specifications

• manufacturer: Baader Planetarium
• SKU / catalogue number: 2961590
• filter type: solar, narrowband
• application: solar astrophotography; camera use only
• central wavelength (CWL): 394 nm
• bandwidth (FWHM): 5 nm
• filter size: 1.25"
• cell: low-profile LPFC 6 mm
• anti-reflection coatings: MC
• observed object: Sun
• required pre-filtering: AstroSolar Photo Film OD 3.8, suitable front-mounted solar filter or Herschel prism in a photographic configuration
• warranty: 24 months

The Baader Calcium GEN-II 1.25" is a practical filter for specialized solar imaging in the calcium band when the goal is to record structures not visible in classic white light.