Player One IR850 850 nm 1.25 IR-Pass Filter S-series (SKU: IR850) all astro filters opinie

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The Player One IR-Pass 850nm 1.25″ Filter (SKU: IR850 ) allows only near infrared above ~850nm, blocking the entire visible band and a significant portion of UV. This minimizes the effects of atmospheric turbulence ( seeing ) and allows for sharper surface details on the Moon, planets (especially Mars and Jupiter), and the Sun (in white light with ERF). High infrared transmission (>90%) makes the filter work great with Player One cameras with increased NIR sensitivity, such as Neptune-664C or Mars-M II.

Key Features of the 850nm IR-Pass Filter

• transmission >90% in the range 830–1000 nm (peak at 850 nm)
• blockage <0.1% in the 350–800 nm band – eliminates visible and UV
• multi-layer, hard-coated dielectric coatings – scratch and moisture resistance
• optical substrate λ/4, parallel ≤ 30″ – no field degradation at large apertures
• 1.25″ (M28.5 × 0.6) thin bezel with blackened edges – no vignetting in FD MINI filter wheels and drawers

Technical specification

• Diameter/frame: 1.25″ – M28.5 × 0.6 thread, 5 mm profile
• substrate: 2 mm optical glass
• cut-on wavelength: ≈ 830 nm
• transmission band (T>90%): 830–1000 nm
• band lock: <0.1% @ 350–800 nm
• coatings: dielectric, double-sided, hard-coated
• flatness: λ/4 (632.8 nm)
• clear diameter: 26 mm
• weight: 9 g

When using the IR850 filter with a monochrome camera at longer wavelengths, you get more stable planetary images ( lucky imaging ) and excellent contrast and sharpness of lunar details. The filter is also ideal for recording photospheric granules and sunspots in white light, when used with an appropriate ERF or Herschel filter.