I've known that human vision has its limits but it wasn't until I watched this video about how good birds vision is by comparison that I realised just how compromised ours is. I thought it worth sharing.
I've noticed many of the effects mention and thought it was just me, good to know I'm not all that broken :)
There are so many youtube videos where people capture stuff with Infra red cameras.
I have also captured weird flying stuff with my old Vx2000, by setting the gain to maximum at night.And using a IR filter on the lens. Those lights were not visible with the naked eye.
Heard that the new cameras are limited by filters to avoid capturing these things which are beyond our eyesight. This includes (mild) X ray like capability by which one can see through clothing.
The best way to capture these 'beyond human vision' stuff is to buy cheap security cameras with high IR sensitivity. They capture everything what they can.
Never tried anything with UV, sounds interesting.
We humans have limited senses compared to so many other animals.
Reptiles/snakes can perceive thermal radiation, birds UV etc.
The new "Cosmos" series had a recent episode where the entire EM spectrum was depicted in visual form overlaid over a city. It's a good thing we can't see into radio frequencies or the clutter would be overwhelming.
Very interesting. But I would like to know about the disadvantages of a bird's eye compared to human eyes. As we all know, there is no free lunch.
For example, we know most bird eyes are very small so they must be pretty poor in low light right? And does the additional resolution make their low light vision even worse? Although an owl has big eyes and great night vision.
I would imagine that being able to see more of the spectrum imposes restrictions on resolution.
According to the video though birds have evolved different types of eyes depending on their environment. Birds of prey have two fovea giving them great depth of field. Sea birds have a rectangular fovea so they can keep the horizon in focus, and yes although not mentioned in the video night hunters have exceptional low light vision.
What I found more interesting is the number of defects in human vision.
it's only the centre of our eyes that sees in focus, the rest of what we think we see is made up by our brains, that probably explains why vignettes appeal to us, they mimic what our eyes see. I've also noticed the other effect mentioned; travel fast through a tunnel or down a tree lined street and the outer area of the field of view goes dim. There's also holes in what our eye can see both from the blood vessels and where the optic nerve connects to the retina. Pretty much most of what we see is a virtual representation created in our brains.
Bob, the brain component of human vision is astounding.
I was hunting for (and couldn't find) an old article where it claimed you couldn't produce an acceptable photograph with the lens from a human eye. Even though the lens is mostly water, the article claimed that the lattice of protein that held it together made for lots of distortion and diffusion of the image. Supposedly the artificial lenses that are implanted are much more transparent. And still we see.
all of that is indeed true. On top of that what the eye sends to the brain is hugely compressed into tokens. There simply isn't the bandwidth in the optic nerve to do otherwise and cracking the encoding system has been the most difficult part of developing an artificial eye.
A friend I used to have suffered from macula degeneration. He had to magnify everything to see it adequately. He was still an avid photographer and I was amazed at how good his slides of an overseas trip were. I never saw him in action photographing but my guess is that each shot would have taken a lot of time to check. They certainly wouldn't have been "snaps".
Very interesting. A while back we were filming some owls and the strange thing was they couldn’t see anything moving that was half a meter right in front of them, from that distance on their sight was amazing and even how they tracked moving objects at a distance
Also birds lungs and air pressure distribution system throughout their bodies is unique which allows them to breath in and out comfortably while flying at high speeds