With a small amount of practice, the rectangular filters can be used hand-held. I find the lens mount too inconvenient if I want to switch back and forth between using the filter and no filter.
I've been shooting in Fl and the tropics a long time. I have success solving the exposure for the sky and pulling up the other areas in post. 'works best from RAW. The other thing, especially this time of year, is to shoot in a northerly direction and shifting your east/west arc accordingly (this advantage wanes between March/April and August/September). The sky is tricky because it's often crowded with variously dense clouds. ND filters can help tame it. Sometimes the clouds can save you. The Tropic of Cancer is in the Florida Straits and the sun kisses it in June. This puts the sun directly over-head for weeks on either side of the solstice. I witnessed in Canada, in full Summer, similar solar elevations we get from late November through early March. The angle and the light were awesome. There are techniques you'll develop for bending your will to the light here. A lot of photographers here on UHH are keen at it. Just work on solving for the sun.
Have a blast!
One more thing, if you're in or near Miami, cruise by Pittman Photo. I got my first camera there in '73. The staff gets the local challenges. To me it makes sense to consult locals... like fishing and diving, you hafta get beyond theory and work local.
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