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Interesting phenomenon, why do eyes see perfectly sharp but a lens cannot focus in aquarium?

Started Nov 12, 2020 | Discussions thread
Jeeter001
OP Jeeter001 Contributing Member • Posts: 768
Re: Interesting phenomenon, why do eyes see perfectly sharp but a lens cannot focus in aquarium?

PHXAZCRAIG wrote:

Does your camera use some sort of infrared focus assist?

I'm suspecting your camera is focusing on the acrylic itself.

No I am in manual focus mode, turning the focus ring.  That's what interesting about it.  If I turn the focus wheel while looking through the EVF the image gets less blurry to a point and then starts getting more blurry.  It never reaches focus.  There is no feature in the image that ever comes into perfect focus.  If I drop the camera down so the light path is near perfectly perpendicular with the glass, then I can get features in the image to come into focus.

Here's an illustration of what I'm talking about:

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