DSLR magnitude estimates by VSOLJ members object YYYYMMDD(UT) mag code SGRnova2012-4 20120721.570 10.15cG Knk.VSOLJ Observer: K. Kanatsu (Shimane, Japan) Instruments: f=50mm lens + Pentax ist*D (measured from G-channel images; magnitude references: Tycho V mag)