Test with a C-5

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David Arditti

The night after my previously reported observation, on February 22, I managed to get my C-5 (127mm SCT) mounted where I could get Sirius with it. I first had to cut down much of a giant weed in my elderly neighbour’s garden, that was in the way. I seem to do most of my gardening at night. Anyway, despite careful collimation, I certainly could not see Sirius B. There is no possibility with a telescope that gives such a messy diffraction pattern as this. But using a refractor of the same aperture, particularly a relatively long focal length one, would be a very different proposition, and I’d like to someone give this a go on a number of occasions from the UK.