30
AUG
2013
M13 Globular Cluster in Hercules

Testing out the barn door tracker

Looking to test the newly improved ‘barn door’ tracker to its limit, I dusted off my old Sigma 75-200mm/f3.8 with 2x tele-converter. But with a hefty 600mm 35mm equivalent focal length, I was prepared for the worst. After less than a minute of polar alignment, and...