Spherical Treadmill for slow motion video

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Andreas Kay
Posts: 7
Joined: Fri Jun 15, 2018 8:08 pm
Location: Ecuador

Spherical Treadmill for slow motion video

Post by Andreas Kay »

Spherical Treadmill for slow motion video: continuation of https://www.photomacrography.net/forum/ ... 542#253542

Images: https://drive.google.com/open?id=1zC8pA ... umxvjoLG8N
A white steel ball of 15 cm diameter sits on two gimbal motors and a third point. The motors are controlled by Storm32 BGC V1.31: https://drive.google.com/open?id=15_hTK ... f9Rsl5Ww6W
To initialize the IMU you have to stick it to the top of the sphere and connect about 10 volts until the sphere is stable.
A quadrant Light dependent resistor LDR with a pinhole or a Photodiode BPW 34 with f=25mm lens is fixed on top of the white ball from the bottom of the LED panel at a distance of about 5 cm, depending on the size of the insect. By adjusting the PID parameters of the gimbal controller the position of the insect is kept konstant.

The camera is Panasonic G9 in most cases with Raynox 150 and 250. The camera is mounted on a video head Manfrotto mvh500ah. Illumination is by LED panels with high CRI (see https://drive.google.com/open?id=1YnzvM ... FvfgFNdI8M).

My standard setup for the Panasonic G9 is:
C3-1 Video 4K/30fps, Creative Video Mode, M f22, 1/125s
C3-2 Video 4K/60fps
C3-3 Video FHD/180fps, Creative Video mode M, FHD/180fps, SK 80/4 on Helicoid, f16 + additional aperture 8mm

Slow motion examples: https://www.youtube.com/playlist?list=P ... rBZhqTVCM-

Ecuador Megadiverso: www.flickr.com/photos/andreaskay/albums and www.youtube.com/AndreasKay

Macro Photo- and Videography techniques: www.photomacrography.net/forum/viewtopi ... 542#253542
Flash Diffuser: www.photomacrography.net/forum/viewtopi ... 546#253546
Field focus stacking: www.photomacrography.net/forum/viewtopi ... 547#253547
Video turning around center: www.photomacrography.net/forum/viewtopi ... 548#253548
Image Stabilization for Field Stacking and Macro-Videography: www.photomacrography.net/forum/viewtopi ... 922#253922

Last edited by Andreas Kay on Sat Sep 28, 2019 5:18 am, edited 7 times in total.

Site Admin
Posts: 5267
Joined: Wed Jan 20, 2010 8:57 am
Location: Valencia, Spain

Post by Pau »

A very original apparatus and excellent results. Thanks for posting them
Your taking off beetles have a comical look for me.

Lou Jost
Posts: 4722
Joined: Fri Sep 04, 2015 7:03 am
Location: Ecuador

Post by Lou Jost »

Andreas did not have much time left when he wrote this. He was eager to share it before he died. Now he is gone. He left this device to me. I will keep his memory alive with it.

Posts: 93
Joined: Sat Dec 27, 2008 9:17 am
Location: Belgium

Post by Stevie »

He may not have been very active here, but i followed him on FB and Youtube with great interest.
He's videos were always of great quality.

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