If Arca had kept the FPS at a more realistic price point, and not forced the new tube @ 550.00 each, the FPS was on my short list. I had high hopes for it on my rm3di and tech glass.
Copals, to me, are un-reliable. I have 6, and none of them allow a 1/500 of a second, most can't hit 1/250th instead shoot 1/180, or 1/350. Others can't shoot 1/125, instead hit 1/180, or 1/90, etc. May not sound like a big deal, but to me it can be. Especially with a CCD back, where the amount of light that is being captured is critical to the quality of the shot, even more so if you shift where light is lowered due to fall off. The ability to get a 1/3, 1/2 or 1/10 (per Arca) shutter speed instead of the hard fixed settings on a Copal would be great.
Arca announced the FPS at Photokina 2014, and as far as I know, it's not shipping yet. Glad to see it made to Photoexpo, so maybe it might still become a reality. I liked the Arca design to use Wifi which means all could be controlled away from the setup. But for me the entry point was 8K, over 1 year ago, and I doubt that has come down.
I am still interested in vibration, if it was handled, how a 1 sec to 20 second shot would work, or do faster shutter speeds have vibration issues, which combined on the rm3di?
The Arca e-shutter also looked good in 2014, which could replace a copal on each lens, but I was hoping for a faster top shutter speed than 1/250th.
Paul C.