Fisheye Camera Typo and Overflow fix

[jcjackch]

Typo fix

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@bottler has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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@jcjackch has updated the pull request. You must reimport the pull request before landing.

[bottler]

@jcjackch Do you want the epsilon stuff to be part of this PR? If so, might it be more efficient to use a boolean_mask like for th_divr? And also please update the PR title.