Red filters and white balance

I've been using GoPro SRP (Snake River Prototyping) Blurfix filter for a couple of years now. It uses URPRO filter. I tape it to the front of the lense inside the housing.

Previously I used a Camdive filter that I purchased from the Camdive shop (it has Camdive label). Then I accidentally broke it in the middle of a trip and had to buy the SRP filter in emergency ($100 filter !). But I think the SRP is actually a little bit better !

The trick about these filters is that it isn't actually red... its more a light orange colour. One of the big problems I had with buying filters off eBay/Aliexpress is that you usually end up with a true red filter (way too red). I even bought a Meikon wet dome + Camdive filter bundle off eBay and the seller put in another brand filter that is actually red (Bubblescuba, as I recall).

I have no idea what colour the Seafrogs one is.. or even if you'd actually get a Seafrogs one with that seller.

With the filter I'm using.. at 25m depth, white balance on camera ends up about 9000K. At 10m, around 4500K mark.

Another thing is if you don't mind experimenting, you can buy a filter sampler swatch very cheaply. I bought one on my last US trip but haven't actually tried it yet.

https://www.bhphotovideo.com/c/product/45189-REG/Rosco_950SBLUX0103_Roscolux_Swatchbook.html

At this point I own quite a collection of filters:

- SRP GoPro Blurfix (I bought an extra secondhand one off eBay cheaply as well for spare)

- Magic Filter (Automagic)

- URPRO originals

- Various FL-D filters

- Rosco swatch filter sampler

- Sandmarc GoPro 4 filter pack

- Eelvision GoPro filters

- Lots of filters way too red

I have a GoPro 5 and Sony X3000 as well and experiment with filters on those. Sometimes I mount it on top of the Seafrogs/Meikon case as a backup camera.

Also, sharpness have never been an issue with underwater filters. Getting the right colour is.