1.7 mm Periscope lens

[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:

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]

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:

[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]

Perfect.