1.7 mm Periscope lens

Started by Janke, February 22, 2023, 10:00:40 PM

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Janke

Here's the very first test of my "homebrew" 1.7 mm Periscope lens, with the optical elements installed in a 3-part aluminum tube with threaded joins:

https://youtu.be/8tTAG7qLysQ

For a description of the optics, go to:  https://www.magiclantern.fm/forum/index.php?topic=9741.msg242199#msg242199

Still some adjustments to be made to the tubes, improving focusing (now push-pull, will be threaded), reducing the vignetting, etc...

This was shot with an EOS M, at f8, 400 ISO, h264 with ML's 3x zoom.


domasa

It is great! Is there some "aliexpress" alternative?

Janke

Quote from: domasa on February 23, 2023, 09:46:55 PM
It is great! Is there some "aliexpress" alternative?

Sure - but it's "only" US$ 2,299.00 :

https://www.venuslens.net/product/laowa-24mm-t14-2x-periprobe/

Look for "periscope lens"... well, strike that, I searched myself and found only trash...

Walter Schulz

The Laowa Periprobe works different to yours. Yours look like a Macro Probe. A bit cheaper but only a bit: https://www.venuslens.net/product/laowa-24mm-f-14-2x-macro-probe/
There is a cheaper probe lens available by AstroHori. Here is a comparision: https://www.youtube.com/watch?v=lhIfVozEVk8

Janke

Mine is not necessarily a macro probe. I can adjust the focus from lens surface to infinity, and I can also exchange the 1.7 mm fisheye lens to a rectilinear 4.35 mm one, the angle of which is similar to a 30-40 mm EOS-M lens.

Here is a photo of the finally assembled lens:



I had to make three threaded tubes in order to be able to position the relay lenses individually... The brass hexagonal "nut" at the left end is the focus, the O-ring gives a bit of friction so it doesn't move unintentionally.

Next part of the project: a prism to enable shooting horizontal views with the camera pointing down...

Nick_Andr


mkoch2

Hello,

what type of lenses did you use in the tube?

Michael

Janke

See the link in the first post above 8) :

For a description of the optics, go to:  https://www.magiclantern.fm/forum/index.php?topic=9741.msg242199#msg242199

mkoch2