I took my new (for me) Shen Hao and my one (so far) lens to the Smokies this past weekend for a shoot. I bought two fabric-wrapped cable releases a couple weeks ago, not wanting to face a single point of failure.
The first day they worked just fine. The second day (very cold!) the cable inside both releases would scarcely extend from the sheath. I finally figured out a way to make the release fire by mashing the sheath into a compressed state, and pushing the plunger, however it was very iffy and problematic and I was unable to get exact timing with that method so on longer exposures I closed the shutter by hand.
The releases have dried out and warmed up and seem to be working fine now that I am not out in the 10 degrees Fahrenheit cold.
Any recommendations on an alternative brand / style of release that will be reliable in all weather conditions? I don't want to deal with simultaneous failures again and the spoiled images from camera shake from closing the shutter by hand-pressing the release lever.