Mars night of 19/20 February 2012 by Peter the Fraudfinder on Flickr.
Via Flickr:
This is a comparison of two Mars images taken about an hour apart using my mono MK21 and 12” f10 SCT, where I took the left hand one using a 1.25 and Televue 2.5x Powermate and the right hand one with a 2x 2” ‘Big Barlow’ from Televue with a 2” diagonal behind it so that it did the image at an effective 3x. I then scaled up the much smaller left hand image to the same size as the right hand image. I seriously expected the left hand image to be more contrasted but to capture more small detail in the right hand image. In actual practice, I think the smaller original image has outperformed the larger image in both contrast and detail, but there is little between them.
The slight halo round the images isn’t poor stacking, individual images were all showing the same artefact, which I put down to atmospherics on Earth!
Peter
