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The 50/200 throws a tighter cone so they are generally recommended for 100+ ft of water, for the guys fishing salt. The 83 has a wide cone range for the shallow guys. I'm on my 3rd FF and 1st 50/200 ducer and can't really tell the difference. If your going to get the 50/200 be aware they are significantly larger in size. Something to consider depending on how you intend to mount it.
Jay
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