A DSLR such as your Canon D50 may not require any external sync device. I have a pair of Nikon D200's which sync perfectly by just a $30 cable made by Nikon. I think you may find that the same is true of the high end Canon cameras as well. Look through the optional items list for your camera or contact Canon and ask. BTW, when taking portraits you should work at the 105 end of your 24-105 lens to avoid facial distortions. Also, at 105mm the subjects will be far enough away (about 12ft)  that your 4.5" base will not be too extreme. Mike Beech --- On Tue, 11/2/10, KAMEL <kamkam2k7(-at-)gmail.com> wrote: From: KAMEL <kamkam2k7(-at-)gmail.com> Subject: [Anaglyphs] help with twin dslr rig spesifications.... To: anaglyphs(-at-)yahoogroups.com Date: Tuesday, November 2, 2010, 4:08 PM   hello every body i'm willing to built  a twin rig dslr i already have a canon 50d with 24-105 mm lens and i met someone who wants to sell his camera of the same type.berezin is seling a vertical mount for twin cameras with toe in option. i did the math and found that stereo base will be around 11 to 12 cm (4.5-5 inches) is this an acceptable stereo base for portraits considering that i will use 24 mm focal length effective 38.4 mm. what if i want to take a head and shoulders shot. what about synchronization is lanc shepard  the right solution or it's only work with sony products. i need to sync. the external flashes too. if not what are the alternatives.                                                                                 thank you                                                                             happy voting day.