2019/07/12 Doubles on Canes Venatici

Some backyard observing using my 10" Dob.
Short session...

STF1692   / 2.89+5.52     / 19.3"   - easy with 50x
STF1723   / 8.56+10.08   / 6.3"     - ok with 208x
15 CVn     / 6.28+9.22     / 1.3"     - fail