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I have reservations about using an inflatable as a photo platform, but it depends in part on where you live. I live along the Rocky Mountain Front in Montana. It is windy here. The water often has a little bit of chop on it, even early in the morning. With a sit-in kayak, your center of gravity is only a bit above the level of the water and the shape of a good kayak hull will smooth out much water surface chop giving you a stable platform to work from.
Inflatables tend to be wider still than a kayak and that will magnify any chop. There comes a point when even the best of image stabilizers will not cancel that sort of movement out. My experience here is with a 13.5 foot long inflatable Zodiak-type boat. This may be more than what others have suggested, but it is close to impossible to photograph well out of it when in wind and chop.
Now, if you are always on very calm water inflatables offer some real advantages. First among them is portability. Packing some models a mile or two is quite practical. They also draw very little water, even less than a hard shell kayak.
A variation of inflatables is in use around here by fishermen, fly fishermen in particular. They are made from two inflatable pontoons, connected by an aluminum framework with a seat added on. They can be quite light and paddle efficiently. The do share the problem of being unsteady on choppy water. That can be lessened by deflating the pontoons a bit so you ride lower in the water.
A person can propel themselves by kicking their legs while wearing fins, or by paddling. I adapted one to use an electric trolling motor. They are also easily adaptable to wearing a blind. They are not as good for covering long distances as a kayak. And if it gets really windy, you are more likely to go where the wind wants you to go, than in a kayak, where you can still go pretty much where you want to go in any wind. Currents can be a different matter.
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