After my telecentric I now make some hypercentric lens experiments
Normal photographiy lenses are endocentric lenses, with a simple telecentric adapter they can be used as telecentric lenses.
And with additional extension tubes in front of this adapter they get hypercentric.
Few people know whats a telecentric is, and even less people know hypercentric lenses.
In short: Normal endocentric lenses have their entrance pupil near or inside the lens, telecentric lenses have this at infinity! The principal rays are all parallel! This results in images without perspective - someting like from far away.
With a hypercentric lens the entrance pupil is behind the object - this results in strange kind of projection.
At the moment I have made my test images with white light, but the commercial available lenses are corrected for monochrome light only.
Most likely I could get much better images with monochrome light too.
Here a dice:
One could see much more than with endocentric or telecentric lenses - this is the reason why hypercentric lenses are used for machine vision!
You see, with white light there are plenty of abberations. But at the moment I have not uses a monochrome light suorce for my tests.
Now an image with the strange perspective - the lines on the paper are parallel.
And here a Edding color marker, seen from behind. You could see the printing on the parallel coat of the pencil.
Use a telecentric adapter like I showed here. Some extension tubes between lens and this adapter, and for example a Helios 44 58mm f/2.0 lens:
Or here with a Jupiter 9 85mm f/2.0 lens and this telecentric adapter:
For a bigger field of view I used a Helios 44 58mm f/2.0 directly on the camera, and with some kind of extension tube a condensor lens from an enlarger:
With the latest I made the dice images.