Blocks visible wavelengths and passes near-infrared above 850 nm
Construction
Substrate / coating
IR-pass coating
Use
Camera use
IR-sensitive planetary cameras
Best for
Lunar and planetary imaging in poor seeing
Astrophotography Fit
Best as a specialty planetary or lunar contrast filter, not a general deep-sky filter.
ZWO IR 850nm Pass Filter is a budget-friendly Infrared pass filter (1.25"). Passbands: IR pass 850 nm.
Best as a specialty planetary or lunar contrast filter, not a general deep-sky filter.
Choose filter size around the sensor diagonal, telescope speed, and filter-wheel or drawer geometry. Flats are still required; a filter can improve contrast, but it will not rescue tilt, bad focus, or poor calibration.
Best paired with
Monochrome planetary cameras and long focal length scopes
Good seeing, high-frame-rate capture, and derotation/stacking software
Lunar or planetary sessions where IR contrast is useful
Not recommended for
General color deep-sky imaging
Visual observing without a clear contrast purpose
Beginners looking for their first all-purpose filter
Where To Buy
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