The Canon 5D Mark II will work with pretty much any EF-mount lens ever made, however it is not compatible with the special EF-S lenses designed for cameras with APS-C size sensors. Designed with a ...

iPhone lenses. He loves photography and camera gear, and previously worked as an editor for Canon EMEA's editorial site. He has a wealth of experience testing and using photography gear of all types.

Canon is set to expand its RF-mount lens line up with three new 'hybrid' lenses for its mirrorless cameras. In a teaser, the camera giant posted a picture (above) of its two existing hybrid lenses ...

[Dan K] had just such a lens from Sigma, but wanted to get it working fully with a camera using the Canon EF lens fitting. Hacking ensued. The lens in question was a Sigma 15-30mm f/3.5-4.5 EX DG ...

The fit and feel of contact lenses are very nuanced, and it can take some trial and error to make sure they’re just right. You want lenses that offer precise vision ...

Initially, the new lens is only compatible with the Canon APS-C camera EOS R7. It will be available in stores from November at a price of 550 euros.

Skip to trip to the doctor's office and get contact lenses delivered straight to your door with the best places to buy contacts online. Nasha is a Managing Editor for CNET, overseeing our sleep ...

Multiplies the focal length of the lens used by 2x without degrading optical performance, AF speed and precision, or operability. Light loss with the teleconverter is approximately 2 stops.

In a ray diagram, a concave lens is drawn as a vertical line with inward facing arrows to indicate the shape of the lens.

Draw a ray from the object to the lens that is parallel to the principal axis. Once through the lens, the ray should pass through the principal focus. Draw a ray which passes from the object ...