In this video, I explain (using a bunch of timelapses) why "polar tracker" or "star tracker" camera mounts allow you to take long exposures of the sky without streaking. I also show off my polar tracking rig, which is my most recent piece of homebuilt photography equiment. It uses a door hinge and a curved lead screw to slowly rotate the camera (approximately 0.25 degrees per minute) and eliminate streaking in astrophotogrphy images.
Based on the design by Gary Seronik:
garyseronik.com...
My parts:
Motor: www.amazon.com...
Gears: www.amazon.com...
Battery: www.amazon.com...
lead screw: #8 threaded rod from Home Depot
Hinge: 8"x8" strap hinge from Home Depot
Controller: LM317 configured as voltage source
Any USB battery will work - this is just the one I have for my phone.
If I re-built the design now I would probably print or lasercut the two necessary gears to save money and have more customizability.
Music in this video:
I dunno by grapes, is licensed under a Creative Commons: Attribution License (creativecommon...)
Source: ccmixter.org/fi...
12 май 2017