The Ion Camocam looks nice. It takes some nice video with good sound. The problem I see with it, from my perceptive, is that it has an even wider angle fish eye lens then the GoPro. The standard gopro has a 170 degree fish eye lens, where has the camocam has a 180 degree fish eye lens. I am just not sure why they design these cameras that are intended to be used on guns with a fish eye lens.
Here are a couple of videos of the camocam in action. In the trap shooting video, yuo cannot even see the clays. In the archery video you can barley make out the target. It does not say in the specs anywhere that it is any king of zoom capabilities, so you are pretty much stuck with a 180 degree field of view.
Ion Camocam Trap shooting Ion Camocam Archery I found used Ion Cam for a little over $80 Included the cam, wifi module, charger and misc brackets. I haven't figured out all the various settings but I'm very impressed with the device and the limited amount of video I've gotten with it so far. Not being a videographer, you can take that for what it is; an opinion.
The only downside iI've found so far is it's size and the need to program it through a console, I.e. cell phone, tablet or PC. It's very light but once mounted on the top of a shotgun, I found it to be much bulkier expected. I don't run optics on shotguns so there may be some bias on my part having used a shotgun that way since I was little, but even with a .mil background in combat arms and extensive training with firearm mounted optics I couldnt get used to it sitting on the top of my shotgun, either receiver mounted in scope rings or barrel mounted.
I initially mounted it on top of my receiver with a set of scope rings that allowed cowitnessing the target through the rings. Seeing how I don't really "aim" a shotgun it affected my shooting. My field auto shotguns shoot 6'oclock POA and the cam interfered with the sight picture causing me to miss shots. I miss enough as it is. In my case, it was difficult to hit what I saw only briefly.
I'm sure with time I could adapt to accommodate the cam sitting on top of my receiver, but I don't see myself using the camera often enough to warrant spending the time to become proficient using it that way at the short term expense of hitting what I'm actually shooting at. More so since my waterfowling vids will never see the light of day on social media.
I've also tried the cam mounted under the barrel at the distal end and I t works well, though you don't have the barrel sight plane to judge distance, POA, or swing through. With it mounted that far out on the barrel, weight is still negligible as the camera weighs very little and is suprisingly light. I use a Polychoke II (which weighs roughly a pound) on the shotgun and with the camera installed I cannot tell any difference in weight.
I like the tubular design as it lends itself to being mounted somewhat unobtrusively on firearms, ATV's, boats, helmets, handlebars, etc. the wide FOV also works well if the cam is mounted statically behind or beside where your sitting. It focuses to infinity and takes great video when the birds drop in the spread right in your face. There are lots of accessories for it and a lfew big box retailers carry it as well. You can find used cams easily.
Just beware that
there are different versions of the same cam with minor external differences but with significant differences in resolution and features/function The versions are best differentiated by model number, not the name on the packaging, as the physical appearance is similar between models. My experience has been that if someone is reluctant to give you the specific model number or has omitted it from their ad, they are trying to pass off an older low-resolution model as the newer version. In the used market the low res versions sell for $20+ versus the HD versions which hover around $50-+120 depending on condition, model, and included accessories.
Regarding accessories, the wifi module will burn thru the non-removable battery pretty fast. I pre-configured the Ion via my MacBook and used the manual switch to turn the cam on/off once it was mounted.