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Showcasing Magic Lantern => Share Your Videos => Topic started by: Janke on February 22, 2023, 10:00:40 PM

Title: 1.7 mm Periscope lens
Post by: Janke on February 22, 2023, 10:00:40 PM
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.

Title: Re: 1.7 mm Periscope lens
Post by: domasa on February 23, 2023, 09:46:55 PM
It is great! Is there some "aliexpress" alternative?
Title: Re: 1.7 mm Periscope lens
Post by: Janke on February 24, 2023, 11:51:03 AM
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...
Title: Re: 1.7 mm Periscope lens
Post by: Walter Schulz on February 24, 2023, 12:06:53 PM
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
Title: Re: 1.7 mm Periscope lens
Post by: Janke on February 24, 2023, 03:25:11 PM
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:

(https://i.ibb.co/Mn5F21y/1-7-mm-Periscope.jpg)

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...
Title: Re: 1.7 mm Periscope lens
Post by: Nick_Andr on March 01, 2023, 03:09:40 PM
Perfect.
Title: Re: 1.7 mm Periscope lens
Post by: mkoch2 on March 23, 2023, 01:24:45 PM
Hello,

what type of lenses did you use in the tube?

Michael
Title: Re: 1.7 mm Periscope lens
Post by: Janke on March 26, 2023, 10:52:01 AM
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
Title: Re: 1.7 mm Periscope lens
Post by: mkoch2 on March 26, 2023, 02:25:44 PM
Quote from: Janke on March 26, 2023, 10:52:01 AM
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

Thank you!

Michael
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