John Whitehouse

Thanks for interest already shown and I’m glad to report the problem was CHRONIC collimating which was established by purchasing ‘Bobs Knobs’ . The enclosed leaflet suggested an initial visual check through the front from a distance of 5-10 metres and it then became very obvious. I then took the decision to remove the secondary lens and the mis-alignment was very evident. I then used a micrometer and levelled it to +/- 0.02mm. Eureka

This is a screenshot I took of the image which is Betelgeuse and I would be interested in any views as to what has caused this distortion.

Will do next week Michael and thanks for your interest.

Thanks for your opinions but unfortunately I took this image of Sirius on an old IPad and duplicated it by photographing it off the screen.

When eventually the clouds disappear, I shall submit an accurate reproduction.

Many thanks for your interest and time.

I seem to have developed a problem which I don’t understand which is becoming more regular as I approach my 79 th. birthday and I attach a recent image of Sirius as an example. 

My equipment:

Celestron 14” Edge HD, 0.7 Reducer, Off Axis Guider, CGX mount, ASIR AIR Plus, ZWO  ASI071MC Pro

any suggestion would be appreciated.