AzPicLady wrote:
Thanks. I find focus stacking quite difficult. Even when locked onto a tripod, using a remote, when images are stacked, ghosting appears. So apparently it's beyond my capability. But I do see its advantage.
Ghosting was the problem with #1. There are workarounds to the problem, both pre- and post-processing wise, but sometimes its just not worth the hassle. In field situations (as in those shown in these images), I seldom use a tripod. Hand-held, I compose for the overall scene, place my camera's moveable focus point on the furthest elements (allowing for dof over a range of distance), then reposition the camera --NOT the focus point-- such that the focus point lies on the foreground element. Using that same focus point (which will typically be left or right or upwards of the foreground thing), I'll then focus on the foreground. With the shutter button half-pressed to lock focus, I'll bring the camera back to the actual composition, shoot the first exposure, allow the half-second or so that it takes for the focus point to re-focus for the background, and
immediately shoot a second exposure. Being pretty steady helps a lot, of course, and I rarely get more than a smidgeon of spatial difference between the two exposures. Regardless, even in short time it takes to make the separate exposures, a lot of movement can take place. Sometimes the discrepancies are curable, sometimes they're not.
For multiple exposure stacks --I often use 3 or 4 separate exposures-- I focus manually, and try to do so as rapidly as possible. Obviously, those are best done with the camera mounted on a tripod, but for me, in the field, a tripod is sometimes more of a hinderance than a help, so... --and its surprising how much movement we do --much less what movement takes place in a scene-- over the course of ten seconds. Every heartbeat, every compression of a shutter button, every re-focus, they all add up. But when you get used to doing it, and do it very quickly, when you go to align the separate images, there's often very little misalignment. (Which is why I almost always 'overshoot' with the intent to include slightly more than I actually want compositionally, the expectation being that I'll crop ever so slightly to arrive at what I actually want.
Like I said before: there's a long answer, too. And I haven't even touched on the 'why' aspect.