Shot with Sigma DP2 Merrill and Flash.
Posted from Flickr http://flic.kr/p/J45X1A
I've started using a speedlite flash for street photography even during daytime to light up the faces of subjects. So far its good. I've faced some weird reactions from people when they get flashed on face but its fun! :-)
I'll continue using flash from now onwards. My current setup is Sigma DP2 Merrill with a small Sunpak pf20xd auto flash. It goes well with DP2m. I generally shoot on Aperture priority, mostly at F/8 - F/10 during daytime. Since this flash do not work with Sigma's TTL, I manually set the exposure compensation (ev value) to "-1 ev" and adjust the flash power accordingly.
My next step is to get a trigger cable or wireless popper.
Few more shots using speedlight:
For night shots, I go complete Manual. The following pic was shot in hyperfocal distance at F/8 and shutter at 1/30 (I guess!). Flash was on Auto aperture mode, set for F/5.6. Dp2m's leaf shutter works at any sync speed!
Some more shots are below, but this time using my Nikon D5100 with a handheld flash at remote SU4 mode.