Central High School - Photography Central

10/06/2021

Whoaa

The first interchangeable dual fisheye lens capable of capturing stereoscopic 3D 180-degree VR imagery onto a single image sensor

07/17/2019

"You see, lenses are made from spherical surfaces. The problem arises when light rays outside the center of the lens or hitting at an angle can’t be focused at the desired distance in a point because of differences in refraction.

Which makes the center of the image sharper than the corners. Which leads to countless YouTube reviews on lenses. And countless hours of watch time. And makes advertisers and YouTubers happy.

In his 1690 book, Treatise on Light, astronomer Christiaan Huygens points out that both Isaac Newton (the greatest scientist of all time) and Gottfried Leibniz (the last universal genius) tried to solve the problem, but couldn’t:

As has in fact occurred to two prominent Geometricians, Messieurs Newton and Leibnitz, with respect to the problem of the figure of glasses for collecting rays when one of the surfaces is given.

It is appropriate to mention that Newton invented a telescope that solved the chromatic aberration, but not the spherical aberration.

In a 1949 article published in the Royal Society Proceedings, Wasserman and Wolf formulated the problem—how to design a lens without spherical aberration—in an analytical way, and it has since been known as the Wasserman-Wolf problem.

They “proposed to use two aspheric adjacent surfaces to correct spherical and coma aberrations, with a solution consisting of two first-order simultaneous differential equations, which are solved numerically according to Malacara-Hernández et al.”

In other words, the solution was an approximation solved with numerical analysis (brute-force with computers), not a definitive one. Moreover, the solution involved aspherical elements, which are harder to manufacture in a precise way and are thus more costly.

To this day, when you see that your lens has aspherical elements to correct for optical aberrations and give you sharper images wide open, you can thank Wasserman-Wolf.

However, the importance of solving this problem goes well beyond giving you a sharper picture of your feet for your nine Instagram followers. It would help make better and cheaper to manufacture optical systems in all areas, be it telescopes, microscopes, and everything in between.

As you can imagine, everyone had been trying."

When you look through your viewfinder and things seem a little bit blurry or lacking definition, it's probably because you are using an “el cheapo” lens.

04/07/2019

Imagine getting a while group of subjects together and asking them to stand completely still while you take three b/w photos with three different color filters so you can combine the photos into the color photograph. His work was stunning, and his focus tack sharp.

A blog about art and science and all the wonderful bits in-between!

03/25/2019

01/09/2019

Lexar has just a new SDXC memory card that packs a whopping 1 terabyte of capacity. It's the first 1TB SDXC card to be available on the market. SanDisk

12/27/2018

The concept of equivalent exposure can be a tricky one to wrap your mind around when you're just getting started in photography. Photography enthusiast

11/23/2018

Color fringing in photos is most often due to chromatic aberration, when a camera lens doesn't focus all colors onto the same point. It's a common

11/09/2018

Want a Photoshop-style image editor without paying any money and without downloading any software? Check out Photopea. It's a free Photoshop clone that

07/09/2018

Here's something you may not have known about the 1800s wet plate collodion photography process: it can make certain tattoos disappear in photos. It's a

07/04/2018

I'm photographer David Johnson, and in this tutorial I'll be sharing how I shoot long-exposure photos of defocused fireworks. Gear List Canon EOS 5D Mark

06/12/2018

"LEDs, hidden in the edges of the wooden frame, strobe at a frequency between 79 and 81 blinks per second—so fast that your eyes don’t even register that the lights are flickering. Meanwhile, an electromagnetic motor at the base of the frame vibrates the object in its clutches—a feather, a leaf, a flower—at a frequency of 80 Hz."

"Slow Dance" turns any object into an optical illusion.

06/07/2018

Some photos appear better executed than others. Some make them appear as ghosts. But still a neat technique.

Wedding photographers are always looking to take creative, novel portraits and a quick, simple trick is often sitting right in their pocket. By using a