query about someimages posted else where

PTS

Hi,
Some extraordinary iamges were posted at:
http://www.hkastroforum.net/view ... d87efe0ce458c9183f3

The author claimed to use 80Ed/600 which I suppose is a refractor.  There is no mention of using "star filter" or similar jigs to produce the crosses which are usually caused bys piders (secondary mirror mount) of reflectors.
Thus I am not sure about the images.....


PTS

ericng

Dear PTS,

80mm refractor surely can produce such beautiful image under good sky. The star spike can be easily generated by putting a narrow wire cross in front of the camera that caused the spider diffraction.

Best Regards,

Eric

Astroandy

Such spikes can also be produced digitally, too.