I shoot hundreds of photos a month. Some months, I shoot several thousand.
I dive with a buddy. Some dives I lead. Some dive she leads. Depends on the site and the conditions, the subject I'm after, etc. We've got a system that works for us. I say this, as she has exceptional patience, loves to dive, and is a surpurb spotter. We're a team down there. Always.
We use HID lights for communication, have about the same SAC, both dive the same type of gear, are about the same skill levels, etc. I never wonder off, and most of all: we both dive to stay found - so we're constantly checking in on each other throughout the dive. I never go more than a moment without checking in on her, nor she on me.
I generally shoot macro in low viz SoCal costal waters. Translation: lots of surge, requiring lots of patience in waiting for the shot. I'm on a subject 3 to 5 minutes, sometimes a lot longer. I'll wrap up on a rock or wreck with my legs, or I'll wedge in with my elbows, compose and hang out for the best shot. But I'm not head down 100% of that time. I'll be sure to pop up and look about every so often, and she likewise circles back to me.
One thing is for sure: we'll never leave to move to the next shot alone. She may scout around a bit (always within site of me) while I'm shooting, but she never drifts off. I will never leave a shot without her. I always get her attention before I peel off and go compose a shot, so she's not all swimming off another 100 feet before she notices I've stopped. Once I'm done, I'll pop up, look about, always (ALWAYS) find her within a glance or two, we re-connect and we move on. At this point she knows if I missed it (I sign big tears) or if I nailed it (Kirk Gibson rounding second.)
I take great offense to divers who believe diving with a photographer is "diving solo." You're simply diving with the wrong photographer. I will never lose you. If we get separated, its your fault. I'm the one moving very slowly and schlepping a huge rig, for heaven's sake. I never wander off, and will always disclose my intentions (right turn, left turn, lets go deeper, I'm stopping now, etc.) I'm very fortunate to have found a buddy that loves the slow, mask-to-the-stones, highly observant and engaged diving I do.
I am a diver sho photographs, not a photographer who dives. Diving always comes first, and that means unshakable buddy awareness. You are my back up gas, and I am yours. If I come up from a shot to consistently find myself alone, you're getting bounced from my team. I have a zero tollerance rule with regards to buddies wandering off while I shoot.
The reverse of that is also true: I'll never blow the dive plan to get a shot. If the plan is to turn at 2000#, I turn at (or very near) 2000#. I won't stay on a subject or go to the next rock and get us out of the plan. When its time to come up, I come up. If the depth is planned to be 120 FSW, I won't follow that ray to 160 FSW. We'll often modify the plan if we see something extraordinary, but I will never unilaterally wander off or abscent mindedly put us in danger or take us way off plan for a shot. Never.
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Ken