Today the Netherlands Naval research vessel arrived in London
Possibly iSpot readers may already know this, but I found it fascinating.
I read it with interest - all new to me.
It says " similar to the effect of a [fisheye lens]"
So what do fish see; or marine mammals for that matter.
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To his name: the Snellius glacier in Antarctica; 3 Dutch survey vessels; a lunar crater; he was probably was the first to try to do a large-scale experiment to measure the earth by triangulation, using church spires; and producing a new method for calculating π—the first such improvement since ancient times.
How have I never heard of him before now? I must get out more…
Well I wouldn’t have known about him if the ship hadn’t passed us.
No need to go out - but just need to ask more questions
You got me checking
I certainly didn’t know any of this, very interesting. Thanks 
Remarkable info about fish eyes. Does not mention though if one system or the other is ‘better’ e.g. for seeing near and far things in sharp focus. Can fish focus on an object just in front of them and one far away or do they not need to focus on anything other than say a metre away as the water distorts or is too cloudy after that?
Not all water is cloudy - and thinking (many years ago) when we would try to catch fish with our hands, in the rock pools at FH - they could see us coming!!
