Reddit reviews SMDV Hot Shoe Hotshoe Safe Sync Adapter SM-512 for Canon EOS Digital Rebel t1i, t2i, t3, T3i, T4, T4i, xt, xti, xs, xsi 300d, 350d, 400d, 450d, 500d, 550d, 1000d, 1100d, 600d, 10D, 20D, 30D, 40D, 50D, 60D, 5D, 5D Mark II, IV, 7D, 1D, 1Ds, Mark II, III, IV, and Canon Powershot G11, G12, G1X
We found 1 Reddit comments about SMDV Hot Shoe Hotshoe Safe Sync Adapter SM-512 for Canon EOS Digital Rebel t1i, t2i, t3, T3i, T4, T4i, xt, xti, xs, xsi 300d, 350d, 400d, 450d, 500d, 550d, 1000d, 1100d, 600d, 10D, 20D, 30D, 40D, 50D, 60D, 5D, 5D Mark II, IV, 7D, 1D, 1Ds, Mark II, III, IV, and Canon Powershot G11, G12, G1X. Here are the top ones, ranked by their Reddit score.
Premium Grade Safe Sync, Made in KoreaSafe Sync circuit regulate high voltage flash to 3v, to keep your camera from damage with old flashes.Using 1x Battery 3V, CR 2032 (Included), battery check button to ensure battery is good24 Month Warranty
By the mention of TTL, I'd say flash.
/u/suain The easiest way is with an on camera flash like the SF40 and using the original brand version, the Nissin i40 in wireless slave mode. If you really want no-on-camera-flash that's trickier, as there are no 'single pin' wireless triggers or 'Leica TTL' triggers to my knowledge.
My method would to be to use one of these to block the TTL pins of the camera, then use a Nikon-fit wireless flash system - though note that you may have to shop around to find a trigger that works when mounted on a single-pin hotshoe.
Best of luck!