But it is tough and usually requires extremely precise alignment with adjustable 5DOF mounts and well matched lenses (read - high end = expensive).
As one of the inventors of several blending methods, I have achieved almost perfect blends with optical filters only but hybrid blending is best with a combination of hardware and software for all but the wonderful HDR laser projectors with over a million to one dynamic range (double modulators). But even with careful setup it is very fussy to get a really close edge match.
If you are not bothered by making it look like one continuous image, two images sided by side is definitely easiest and has the lowest loss in pixel count, due to no overlaps. There are solutions for this we used all the time in our simulators and VR Setups such as optical filters, Mystique software black blending or very expensive HDR laser projectors where black is truly black. What Jacques refers to we called the “black blending problem” at Christie since most projectors “black” is not truly full black so the two overlaps sum to grey.
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