3 ms·
I don't understand how, with an 8s exposure from a moving vehicle, the photos have perfect stars. There should be streaking.
by kghose 12y ago
I don't understand how, with an 8s exposure from a moving vehicle, the photos have perfect stars. There should be streaking.
- colanderman 12y agoSee my explanation here: https://news.ycombinator.com/item?id=8225519 https://news.ycombinator.com/item?id=8225519 (TLDR: consider (a) how the moon does not appear to move when viewed from a car moving in a straight line, and (b) that the surface of the Earth is constantly moving at ~1,000 MPH.)
- lutorm 12y agoAn 8s exposure with a 10mm lens will not show trails at the resolutions shown there.
- windsurfer 12y agoNo, planes don't rotate much when flying - it would be inefficient. Also, it is using a 10mm lens.
- jdpage 12y agoTurns out that stars are really friggin' far away, so with a nice steady plane and some stabilization equipment, you're not going to get enough parallax for streaking to occur.
- kghose 12y agoHi, streaking is not necessarily due to parallax. It's due to movement of the camera and or movement of the earth. (Try taking a hand held long exposure of the stars, for example). I guess for that 8s the plan was very stable (no rolling/pitching) AND the focal length is short enough and the resolution low enough the streakiness is masked. I'm still impressed by the amount of stars he captured.