Indoor low light, a mix of 15 chandelier-mounted incandescent lighting in clear,large base tulip-shaped 30 watt bulbs,plus window light coming in from the left through mostly-closed white venetian blinds, plus the light from two computer monitors. Hand-held with the 105 DC lens. Spencer's looking at the photos I took the day before,and in this one Studley had climbed up onto the roof,and both Spencer and I got a hoot out of his meewing and agitated travelling across the roof tiles.