The roll-over image was captured from urban skies using a 400mm F8 RC

This combination helps reduce the effects of light pollution

while imaging from an urban sky, while maximizing the signal and system resolution.

The base image, was taken through a 250mm F4 but with higher sampling (smaller pixels),

it takes advantage of a low noise camera and uses hundreds of short exposure images

to reduce noise, the effect of atmospheric turbulence and tracking errors.

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Lum: 129@60s and 254@20s
r: 97@60s
g: 69@60s
b: 71@90s

8 hours total exposure time (image coutresy Ray Johnson)

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Approx 2 hours of Luminance data, 10 minute sub-exposures.

40:30:50 mins RGB

(before you ask...selective noise masking has attenuated some background field stars

...pixel-peepers will no doubt see where the mask was applied :) )

4:30 hours total exposure time (image by Peter Ward)

Can you see all 26 grey scales above?