It sort of works, but is no substitute for a real pair of glasses. The lenses are made of a pair of cheap plastic, one of which is movable. You could use them in an emergency, but you would be … Continue reading →

Focal length impacts the look and quality of a photograph in several ways: Field of view. Focal length determines how much of a scene is captured in an image. Shorter focal length lenses are called wide-angle lenses because they allow … Continue reading →

Zooming in or out alters the focal length, and the lens extends or contracts just like many other zooms do when changing focal length. The camera also has a “digital zoom” feature, but that does not alter the fact that … Continue reading →

The f/1.4 and other wide apertures on the Canon EF 50mm f/1.4 USM are perfect for available-light shooting. It is an especially useful lens for low-light, indoor photography, especially when a flash is not permitted, such as in a church. … Continue reading →

Since presbyopia will continue throughout your life, it’s important to understand that it can complicate other common vision conditions like farsightedness, nearsightedness and astigmatism. Eye experts call these common eye focus conditions refractive errors. But there’s good news ahead. Can … Continue reading →

Press the MENU button on the back of the camera. Scroll down to the SETUP menu (the wrench icon). Highlight Non-CPU lens data and press ENTER. Choose a lens number (typically between 1 and 9). Enter the focal length and … Continue reading →

Astigmatism is an irregularity in the overall shape of the eye or the curvature of the cornea (the clear outer coating of the eye). Presbyopia occurs when the lens of the eye is no longer able to change shape. Can … Continue reading →

On a military procurement manifesto, they’re S9s; but to a new soldier who’s just received a new pair, they’re BCGs, or Birth Control Glasses. What glasses can you wear in the Navy? When in uniform and outdoors, conservative sunglasses are … Continue reading →

One of the most obvious reasons is that manual focus enables you to shoot in any light conditions. Making manual focus the best option for low light photography. When using autofocus, your lens will keep searching for something to lock … Continue reading →

Both A and E mount cameras have full frame and APS-C sensors options. Among the many sensor sizes in common use, full-frame is considered to be a large format while APS-C is a medium format. Is E-mount full-frame? The E … Continue reading →

Most lens mounts in current use are bayonet style, in which a lens is attached to the camera body by registering the lens in proper orientation with the camera body, then giving a slight twist of about 45-90° to lock … Continue reading →

For things like Zoom/Skype/Teams video calls, a 720p webcam is fine and can help save some bandwidth compared to a 1080p camera. You likely won’t notice a difference in video quality as Zoom/Skype/Teams compress the video feed anyways. Is a … Continue reading →

For architectural photography the 28 mm is not wide enough, the 24 mm is more appropriate. Is 28mm wide enough? A focal length equivalent to 28mm on a 35mm camera is often considered ideal for landscape photography because it covers … Continue reading →

The EF 17-40mm f/4L USM is an ultra wide-angle zoom lens that offers excellent image quality and a constant maximum aperture. Is a 40mm lens a wide angle? As indicated by the “ultra wide angle” designation, the 17-40mm focal length … Continue reading →

Sigma Lenses Fully Compatible with Nikon Z, But Tamron Lenses Aren’t. Sigma and Tamron are both popular manufactures of third-party lenses that are used by Nikon DSLR shooters. Does SIGMA make lenses for Nikon Z? Sigma to produce Nikon Z … Continue reading →