Andover Oxygen-III Filters

The Oxygen-III Nebula filter has a narrower bandpass than the
Andover Three Channel Narrowband Nebula Filter. The narrow
bandpass of the O-III Filter blocks out sky glow artificial pollution
and isolates the two O-III lines centered at 495.9nm and 500.7 nm.
This filter produces a significant increase in contrast and is best
suited for viewing Planetary Nebula.

These premium multilayer dielectric filters are made in the USA
by Andover Corporation, an ISO-9001 supplier of filters to the
scientific, military and space industries. Each filter comes with a
spectrograph of that individual filter, not just 'stock' curves or
a few specs written on the package. Filter case included.

Check out this Review by Ed Ting.


Specifications:
Optical Quality: TWF of 3-5l per 25mm and parallel to 1 minute of arc or better
Surface Quality: 80/50 or better per MIL-C-675
Bandbass: Greater than 85% at 495.9nm and 500.7nm
Bandwidth: 10.02nm at 50%
Coatings: Broadband anti-reflection coating on exterior surfaces
Durability: Per MIL-C-48497A, moderate abrasion
Construction: Laminated type filter mounted in a threaded ring
Clear Aperture: 1.25" is 28.6mm diameter, 2" is 45mm diameter
Spectral Data: Each filter is supplied with a spectral bandpass curve




$000.00 - #DFO3 - No Longer Available - Andover Oxygen-III filter, 1.25"
$000.00 - #DFO4 - No Longer Available - Andover Oxygen-III filter, 2"


Price includes FREE shipping in the USA!

Ordering



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