Bottom: In contrast, a teapot with a spout coated by a superhydrophobic coating (here black soot) fully avoids dripping (b and b'). Image: FIG 1. from arXiv:0910.3306. (PhysOrg.com) -- A team of scientists from France have worked out why teapots dribble at low flow rates, and how to stop them.The effect is called the teapot effect, and solving it could finally put an end to tea stains from dribbling teapots.Previous research on the teapot effect has found that at higher flow rates the layer of fluid closest to the surface of the teapot spout becomes detached from it and the fluid flows smoothly.eating the teapot effect with a superhydrophobic coating. Top: water flow under the spout of an (hydrophilic) teapot, exhibiting a bending of the streamlines (a), and drip-ping as the water flow decreases (a').
Eyelevel Angle. An eyelevel angle is the one in which the camera is placed at the subjectâs height, so if the actor is looking at the lens, he wouldnât have to look up or down. Eyelevel shots are incredibly common because they are neutral.
As I began shooting landscapes as more of a hobby, I began to discover the magic of wide angles. Wide angles give a wide expansive view, and when used correctly, can wrap you in the scene. My favorite lenses for landscape work tend to be in the ranges from 14mm f/2.8, 16-35 f/2.8, and 24mm f/1.4. Wide angles should be used when prominent foreground objects are present. The primary mistake made by new photographers is to use wide angles incorrectly- by not being close enough, having no interest in the foreground, or by trying to include too much in the scene. Wide angles are also handy in tight areas, like small rooms, cars, caves, etc. They can give volume to the small area. Wide angles have the potential to drastically change your photography. Standard lenses tend to range from ...