I am having issues getting sharp corners using the combination:
Camera: Sony A6300
Dome: 6 inch dome (5516.12) that is recommended by Ikelite (there is another 8 inch dome recommended too)
If you see samples attached, they are shot at f8.0 and still show quite soft corners.
I have been reading forums and tutorials, and I found 3 potential solutions but want advice before I invest in more gear required to test them
1. Get a bigger dome - there is an 8 inch dome from ikelite that fits this lens too. Not ideal as I have to purchase ANOTHER dome and its bigger and makes CFWA a bit harder which I like to do
2. Decrease aperture size more, like down to f12 or something - didn't actually test this during my trip because I didn't process the pictures until after, but f8.0 seems to be small enough based on what I've read from forums?
3. Get a close up lens - does not seem to have trouble focusing, but could be the edges are too close? Ikelite also does not say it needs a close up lens