Look closely at this image, stripped of its caption, and join the moderated conversation about what you and other students see. By The Learning Network Tell us about a time when you did ...

\(power \ of \ a \ lens \ (D) = \frac{1}{focal \ length \ (m)}\) A lens has a power of -3.33 dioptres. Calculate the focal length and state what type of lens it is.

Profoto now has an answer… It's new range of white softboxes that swap the usual silver interiors for all white ones - to produce a light source that is less harsh, and less focused. According to ...

Photo of the eclipse through red 3D glasses, cropped and with RAW settings tweaked. (Image credit: Future) I wouldn't have left the sun pointing down the lens at my camera's sensor for long, but I was ...