Focal length size guide Focal Length Type of Lens What is it used for? 14mm – 35mm Wide angle Landscape, architecture 35mm – 85mm Standard Street, travel, portrait 85mm – 135mm Short telephoto Street photography and portraits 135mm+ Medium telephoto … Continue reading →

Tight lens syndrome is when a soft contact lens fits too tightly and starts to stick to your cornea. The cornea is the clear outer layer on the front of your eye. When a contact lens on your eye shrinks, … Continue reading →

The working distance decreases as you increase magnification. The high power objective lens has to be much closer to the specimen than the low-power objective lens in order to focus. Working distance is inversely proportional to magnification. What happens when … Continue reading →

Whereas, a vignette caused by a variable ND filter is simply underexposed. With that covered, let’s look at how we can apply a soft fix. Do ND filters cause vignetting? It’s especially vulnerable at wide angles. This is not vignetting, … Continue reading →

Tuck the end of the cord into the wrapped cord so it does not unwind. Place the cover over the microscope. Hold the microscope by the arm and base while putting it away. Check to make sure your lab station … Continue reading →

The zoom capacity of a zoom lens is generally quoted as the ratio of the longest focal length to the shortest focal length, without regard to the image size. So its 55/18 or about 3:1 Zoom ratio. It is 18–55 … Continue reading →

Zoom lenses are also popular with sports photographers because of the wide range of coverage they provide. When a surfer hits a wave and rides it toward the beach, you don’t want their body to overflow the frame as they … Continue reading →

All microscopes are designed to include a stage where the specimen (usually mounted onto a glass slide) is placed for observation. Stages are often equipped with a mechanical device that holds the specimen slide in place and can smoothly translate … Continue reading →

Is it bad to change the lens while the camera is still powered on? Nikon doesn’t recommend it. “… make sure you turn the camera’s power off before changing the lens as the image sensor itself generates a static electric … Continue reading →

Vision problems such as myopia and hyperopia can be corrected with lenses that help focus light on the retina. Myopia is corrected with a concave lens, while hyperopia is corrected with a convex lens. How do glasses correct hyperopia? Wearing … Continue reading →

They have an objective lens (which sits close to the object) and an eyepiece lens (which sits closer to your eye). Both of these contribute to the magnification of the object. What parts of the microscope are used to magnify … Continue reading →

Photo by: ‘Adam Welch’. And of course, the most surefire method of determining if your camera is a DSLR or SLR is by searching for the film compartment. Naturally, if you’re able to load film into the camera, it is … Continue reading →

A wide-angle lens increases your horizontal scope, while a telephoto lens allows you to focus in on a subject from far away. These are the two main differences between a telephoto lens and a wide-angle lens: Focus: A wide-angle lens … Continue reading →

The shortest focal length, or “ultra wide-angle“lenses, range from 14mm to 20mm, and are followed by “wide-angle” lenses from 24mm to 35mm, and then “standard” lenses from 45 to 70mm, which are similar to the field of view of the … Continue reading →

The context for the work, including the reason for its creation, the historical background, and the life of the artist, is not considered to be significant. Examples of formalist aestheticians are Clive Bell, Jerome Stolnitz, and Edward Bullough. What are … Continue reading →