Last night was the seeing was good and the air was nice and dry. To my surprise, I was able to resolve 14 stars, using direct vision, across M22 using a 101mm refractor working at 26x! Using averted vision, the star count doubled. Increasing the magnification to 154x, I saw a myriad of stars spanning the entire face of M22.
Next, for comparison, I swung over to M13. I could see no individual stars even with averted vision at 26x. Switching to 154x, M13 resolved into stars nicely, albeit not as spectacularly as M22. From memory M22 was about 30 degrees up whereas M13 was roughly 45 degrees up from the horizon.
I was never able to resolve stars in either glob using 20x100mm or 16x70mm binoculars. I can only imaging what one would look like through a large (8"+) refractor...
It sure would be nice to see Omega Centauri and 47 Tucane from Australia!
What is the smallest refractor/lowest mag combo you have used to resolve globular clusters (particularly M22 and M13)?
Thanks for your responses.
Edited by Jeronimo Cruz, 17 October 2014 - 11:35 AM.