Is this Stroke Crooked ... or is it Parallax? скачать в хорошем качестве

Is this Stroke Crooked ... or is it Parallax?

Dr. Dave explains and demonstrates why Samm Diep's stroke looked crooked in my previous Top 10 Draw Shot Secrets video. Aim and stroke direction can look off in video not just due to poor stroke mechanics ... camera lens and view-angle parallax can also play big roles. For supporting resources, see: Top 10 Secrets of a Good Draw/Backspin/Screw-Back Shot:    • Top 10 SECRETS of a Good DRAW/Backspin/Scr...   Corey Deuel jump shot with overhead camera:    • Deuel/Dechaine vs Van den Berg/Boyes | Mos...   Wikipedia “parallax” page: https://en.wikipedia.org/wiki/Parallax Wikipedia “perspective” page: https://en.wikipedia.org/wiki/Perspec...) Subscribe to Dr. Dave's YouTube channel (and be sure to turn on bell notifications): https://www.youtube.com/DrDaveBilliar... Show your support to Dr. Dave for his work by clicking on the donation button near the top of this page: https://billiards.colostate.edu/ All of Dr. Dave's full-length instructional videos are available to stream or download here: https://DrDaveBilliards.com/stream/ and in physical DVD format here: https://DrDaveBilliards.com/ Detailed product information and purchasing advice can be found here: https://DrDaveBilliards.com/products/... Good Luck With Your Game!!! NOTE: Samm's stroke looks more crooked than mine in the video for three reasons: 1.) The camera angle was slightly different (at a larger angle) with her shot. 2.) As I pointed out in the video, her arm is shorter, which increases the up and down motion of the cue with the pendulum stroke for a given stroke length. This increases the perspective/parallax effect. 3.) Her stroke was definitely not straight, but not by as much as the video suggests. The "apparent" crookedness is exaggerated by the perspective/parallax effect. Further explanation of the perspective/parallax effect: When the camera is not straight inline with the shot, the perceived direction the cue is pointing varies with cue elevation, as clearly demonstrated with the examples in the video. If one uses a pendulum stroke, with a fixed shoulder and elbow, the cue elevation changes during the stroke. Therefore, the perceived direction of the cue changes during the stroke. I can assure you the strokes in this video were straighter than they look (albeit, Samm's stroke was definitely not straight). Here's another follow-up video that provides even more clear and convincing evidence to explain and demonstrate the optical illusions that can occur with video camera perspective and parallax effects related to an elevated cue or a cue that changes elevation during a shot (e.g., as with a pendulum stroke): Crooked Pro Pool Strokes in Video:    • Crooked Pro Pool Strokes in Video