With regard to the operation and features of OpTech I can refer to the detailed and good review of M. Lay.
The big difference between the 3 belts consists primarily in the crash safety of the camera. Namely, while only a camera tripod mount screw holding the photo device both during SunSniper and the Black Rapid, the OpTech offers 2 Camera mounts (to function later). The great danger in Sunsniper and Blackrapid is the loosening of a fastening screw by movements, walking, fiddling with the camera for a prolonged period. These cases of occasional camera total loss due to falls are not too far-fetched; They are found in the local reviews of relevant articles, as well as other Internet forums.
OpTech supplies with 2 short loops for attaching the camera to the lifting eyes. If you use this, the camera is level, which is not convenient enough to touch. A demonstration video shows that it is better to fix the 2nd loop on the side of the carrying eye mounted battery handle (the video example: Canon). However, this will not, for example, at Nikon, because there is the battery handles no lateral carrying eye. I did the following: From an old Manfrotto quick release plate fastening screw has been mounted, provided with a slightly thicker spacer and then screwed a cut piece of rubber tripod socket cap (sticking). Screwed into the tripod socket of the battery grip (also works when it is screwed directly into the camera bottom) has a tight fit, threaded into the bracket of the screw a 3/8 "webbing connector of OpTech, bring and clipped as the Loop to the same length. Alternatively, you fix the whole thing with the normal Blackrapid screw and a small key ring or Blackrapid screw for Manfrotto plates.
Advantage of this design:
1. The camera hangs on 2 attachment points; if one should be solved, holds the other.
2. This attachment I have described, however, also leads to optimal grip readiness. The camera then depends namely with the right-side camera handle upwards, and is therefore ideal in grip position, as opposed to the suspension of the two upper eyelets where the camera with the prism faces upwards and also in contrast to the suspension at SunSniper and Blackrapid where the camera with the bottom points upwards.
3. The 2 clips a certain theft security is given, because you have to very specifically and very firmly press to dissolve. This is only possible after the other and thus even more noticeable to the photographer.
4. In contrast to Sunsniper when moving the camera to the belt remains the padding on the shoulder. The proven good OpTech padding (shoulder adapted around here cut) Tägt excellently.
The winner of my personal contest is the OpTech Utility Strap Sling!
PS: It was nice when the manufacturers of non-canonists or for those who want to wear the "naked" camera with handle upwards, would offer an immediate Sling with camera ground screw, a loop and a 3/8 "connector as an alternative would be.
Subsequent improvement proposal of design: Meanwhile, I have the Manfrotto screw with 3/8 "-Webbing connector through the" camera screw Nyfi "Sun-Sniper and a 2nd OpTech loop, attached thereto replaced. Now the construction works really well and has no longer the appearance of the Provisional. This solution is also significantly better than with the above-mentioned Blackrapid screws whose bow is stuck in one position, because on the contrary, to the top of the screwed-in screw freely rotatable upper part of the Sun-Sniper-screw just does not rotate. Funnily enough, the single camera-bolt Sun-Sniper is also explicitly offered solutions for treasury (crafts).
