The Antlia IR Pass 685nm filter is an absorptive filter that allows infrared
light with wavelengths of more than 685nm to pass through. At these longer
wavelengths, the sensitivity of the unaided eye is reduced, so it is not
suitable for visual observations. The filter is highly recommended for any
planetary photography. At long-wavelength spectral range the atmospheric
air turbulence (seeing) has much lower impact on the sharpness. The
closer to the infrared band, planetary images are less disturbed by
wavefront distortions in the atmosphere (seeing), result in the sharpest and
highest contrast image possible.
By combining a luminance image taken with the IR-Pass filter, along with RGB and U-Venus filters, overall image
sharpness is significantly enhanced and details of planets in different bands are taken.
The filter is also possible to image the other planets during daylight due to the dark background sky created by the 685nm IR Pass Filter.
Schott optical substrate
1.25” mounted, (2mm+/-0.05mm)
Surface Quality: 60/40 (Refer to MIL-O-13830)
2 sides fine-optically polished to ensure accurate 1/4 wavefront
30 arcsec parallelism
1.25”( 28.5*0.6 )
Ultra-thin filter cell to minimize vignetting by maximize possible clear aperture
Black Anodized Finish
Laser Engraving No Fading
Solar Observing and imaging
DO NOT LOOK AT THE SUN WITH ANTLIA FILTERS.
Serious eye damage will result if you fail to observe the warning.