The key point to this image is soft light. Probably doesn’t look like a flash unit was used, does it? That is because the light was diffused and to camera right.
The flash I used is a small portable unit SF-26 ( Amazon: http://amzn.to/2CAy1PD ) and a Nikon 4765 Flash Cord ( Amazon: http://amzn.to/2Az4xzT ) in full automatic mode. The camera balances ambient light with the flash automatically and I simply add a full CTO to match the room temperature.
Here is a diagram that shows the placement of things in the room.
Here is a list of the gear used with direct links:
Leica M: http://amzn.to/2CxPCI3
Leica Summilux 50mm: http://amzn.to/2m0pSwF
Leica SF-26 Flash: http://amzn.to/2m0akcu
Gel Kit: http://amzn.to/2CJXHMV
Nikon Flash Cord: http://amzn.to/2Az4xzT
Check my instagram account @studioseightyone and my YouTube channel for more stuff!