Can I connect a METZ 45 CL-1 to my CANON D600

The answer is "YES", it can be done and my staff have been shooting it rather than TTL.

Buy the ATG Gold SM-512 (only available in USA) or ATG's SMDV SM-512 Adapter.

You mount this on the camera's hotshoe since your camera has no PC Sync Socket.
Then you plug the PC Sync Cable for Metz into PC Sync Port of the ATG.

The steps:
1. Set camera dial to "M"
2. Set Shutter Speed to flash sync speed
3. Set Aperture of say F5.6
4. Set camera ASA/ISO to say 400
5. Set flash ASA/ISO to 400 (both camera & flash must equal)
6. Set flash to "C" with those selections but this case is F5.6
7. With flash & bracket & PC Cable attached/connected.
8. Now, you are ready to shoot straight or bounce.

ATG designed & invented that ATG Auto Mode Sensor.

Contact Alzo Digital, CT if you ever get to USA.
They use Metz and can get you to specialists.

Yes, this is the way the flash can be used with the contemporary digital cameras. The camera has to be set to Full Manual mode (in point of the exposition), Exposure Time to 1/100 sec (or the shortest exposure that still assures full opening of the shutter). Aperture on the camera must suit the working aperture on the flash, also ISO speeds must match. The computer in the flash measures the reflected from the subject light and quenches the flash, creating the correct exposure. Mecamat sensor, having narrower reception angle and a sight, helps in achieving the correct illumination even on a relatively small subject. Sync voltage of Metz 45CL1 does not make harm to any digital camera, so you can use even the cheapest hotshoe-to-PC adapter available at many camera shops or you can buy one online. No need to spend much on sophisticated adapters.