An un-calibrated frame from last night. 60 sec in “V” from a lowly G3 (as my 460EX is still hooked up to my ALPY) but I managed an hour before the cloud rolled over. A bright sky but SNR was OK. AIP4WIN MMT gives Mv 13.300 (+/- 0.005), falling to 13.45 (+/- 0.05) using 9 ensemble stars, but notice the increase in error as the clouds hit.
.