Depth of field (DOF) is defined as the area in a projected image, forward and aft of the focal plane, which also appears to be in focus in the image. When you pass light through a lens and focus that light to form an image on a piece of film, digital sensor, projection screen, etc., the area of the image that is in true focus is razor thin—the focal plane. Everything else is out of focus, to some... READ MORE
In Part I we talked, in a fair amount of detail, about what DOF is and how it is determined. If you are happy with what you learned in Part I and do not feel the need to know the math behind all of the different factors in DOF, then you are free to go out and start confidently manipulating DOF... READ MORE
There are several myths and misconceptions surrounding Depth of Field. In Part I, we looked at the basics of DOF. Part II got into the math behind how to calculate DOF. Here, in Part III, I hope to... READ MORE
There is a great deal of confusion surrounding crop factor, and it is particularly difficult to explain, but let’s give it a try, shall we?
Before we dive in, let me dispel two vicious rumors related to crop factor that are circulating through the photography (Internet) world today:
Crop factor does NOT affect a lens’s focal length.
Crop factor does NOT affect a lens’s aperture.... READ MORE
When I was a kid, before kids were invented, I had limited choices for portable gaming. I owned (and cherished) my Mattel Football handheld game, which was just a series of red dashes against a painted-on top-down football field on a hunk of plastic that weighed about a pound. Each time a play happened, there were a series of electronic squawks and squeaks that sounded like robot chipmunks... READ MORE
B & H Photo isn’t a bookstore, but we carry more than 500 titles of photography books and tutorials. If you are like me, photo books can be an endless source of information to help you learn the technical ins-and-outs of the art, and can be a well of inspiration to help you develop your craft and encourage you to try new techniques, travel to new locations, and experiment with your gear.
Here... READ MORE
The Ikan Multi-K XL Variable Color Temperature Studio Light is different from what most people have come to think of as an LED light. The first thing that you will notice is that it is heavy duty and built to work. There is nothing flimsy about this light. Does this make it heavy? Not really. What the ... READ MORE
In the following video, Mia McCormick, from KelbyOne Media, takes a quick look at Panasonic’s lightweight HX-A1 Wearable Action Cam. The video examines the camcorder’s “quad-proof” design that is waterproof, dust proof, shock proof, and freeze proof, to meet the demands of action sport and... READ MORE
In the following video, Larry Becker, of KelbyOne Media, describes his hands-on experience with the 24.2MP EOS Rebel T6s and T6i DSLRs from Canon, which offer significant improvements to the... READ MORE
In this week’s video, FocusEd presents a discussion of lens mounts. Not every lens fits on every camera, and not every lens from each manufacturer works on every camera from that manufacturer. This video examines cameras from Canon, Nikon, and Sony, their mount systems, and explains the differences between their respective mounts.
It is a commonly held belief that the frequency response of human hearing is between 20 Hz and 20,000 Hz, with degeneration of the upper frequencies occurring as a person grows older. More recent research may indicate that human beings can detect signals much higher than this, though the perception of those frequencies may be expressed as harmonic interactions and by the transient crossings in... READ MORE
Yousuf Karsh was an Armenian, born in the Ottoman Empire in 1908. After his family fled, he was sent to live in Quebec, with an uncle who was a portrait photographer. Noticing young Yousuf’s interest and ability, his uncle arranged for an apprenticeship with the noted Boston photographer John Garo. After a three-year stint with Garo, Karsh returned to Quebec and began his illustrious career. In... READ MORE
In this travel-related video, produced during the 2015 B&H Optic Imaging Conference, travel photographer Robert O’Toole talks about his favorite subjects: wildlife and Japan. In this video, O’Toole describes the tools and techniques needed to capture dynamic wildlife photographs and the challenges of shooting in cold, wintry environments.
In the following video, Allan Weitz takes a look at Zeiss’s latest lens offerings, the Batis 85mm f/1.8 and 25mm f/2 for full-frame E-mount cameras. Weitz reviews the different optical... READ MORE
If you have a Windows 7 or Windows 8.1 PC, you probably already got the notification from Microsoft urging you to reserve your copy of Windows 10. With July 29th almost here, you should reserve your copy to ensure you get access to Windows 10 as soon as possible. Here are the simple steps to reserving your copy.
Reserving your copy is fairly straightforward. The "Get Windows 10" app will push a... READ MORE