Description: 16" f/4.5
Mirror Thickness 1.625"
Substrate: Pyrex
Focal Length 72.494"
Exact F ratio 4.567
Test Results
RMS Surface Error 1/127.67 wv.
P-V Surface Error 1/34.38 wv.
Strehl Ratio 0.990
Encircled Energy Ratio 0.989
Test Wavelength 635 nm
Analysis Wavelength 550 nm
Design Conic -1.00
Only 1500US advertised on astromart.
I'm extremely skeptical of this being represented as the actual quality of the optics.
I'd be impressed if someone **randomly**(not the ones used) chose say 6 zones tested with a couder screen and it came in at better than 1/6th wave.
I now produce mirrors on a limited scale say 6 a year for local astronomers 6-16 inches in aperture in NZ and only ever claim they are a smooth consistent 1/8th wave on the wavefront.
Interested in what others think. Inwonder if this outfit can really walk on water.
Phil Barker
Mirror Thickness 1.625"
Substrate: Pyrex
Focal Length 72.494"
Exact F ratio 4.567
Test Results
RMS Surface Error 1/127.67 wv.
P-V Surface Error 1/34.38 wv.
Strehl Ratio 0.990
Encircled Energy Ratio 0.989
Test Wavelength 635 nm
Analysis Wavelength 550 nm
Design Conic -1.00
Only 1500US advertised on astromart.
I'm extremely skeptical of this being represented as the actual quality of the optics.
I'd be impressed if someone **randomly**(not the ones used) chose say 6 zones tested with a couder screen and it came in at better than 1/6th wave.
I now produce mirrors on a limited scale say 6 a year for local astronomers 6-16 inches in aperture in NZ and only ever claim they are a smooth consistent 1/8th wave on the wavefront.
Interested in what others think. Inwonder if this outfit can really walk on water.
Phil Barker