I use a top-down viewer too. I just bought an Avast Portal for a longer lens.
I use a 5d and 24-70F2.8 with the white balance set to about 14K... no need for filters, but not everybody has one of these.
If you turn off all of your pumps, then the top will get really stable and you can do it that way too... but the lights will reflect a bit.
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