Mars 9th January 2021

[astroman001]

Mars now only 9.6" diameter.  Thought I would still have a go, managed to get reasonable detail sowing Sinus Meridiani near centre and Hellas Basin at upper left. No sign of South Polar Cap. Also horrible edge rind on bright LH limb.

Peter

[wavydavy]

Still a great pic, im a newbie to planetary imaging, im hoping you can help, over several days, ive had exactly the same issue with the edge like you mensioned, but my camera is a mono. Do you know what causes this? Is it the seeing conditions? As ive not managed to get rid of this.......Regards Dave.

[astroman001]

It's edge rind - Google it. Caused by optical diffraction, hard to get rid of. A major issue imaging small bright planets.

Peter

[Pete Presland]

Very nice some fine detail showing there