Nikon D5100 Tips and Tricks

SIRI Technology in the Canon EOS 5D Mark II? Seriously?

Vivian Maier – The Nanny Photographer

Fixed Lens vs Zoom Lens, Which One is Better?

Tips: Photographing Fish in Aquariums

Photoshop has gone too far!

The Digital Photography Book  by Scott Kelby

Tips in Photographing Faces with “Unflattering” Features

Utilizing an External or Camera’s Flash to Freeze an Object

Which Lens should I Buy Next?

Understanding GN Value and how it’s Calculated

Posted by oneslidephotogaraphy On March - 9 - 2022

How to calculate GN value

How to calculate GN value



GN, short for Guide Number, Is the amount of power the light transmitted by a flash device is. It’s the result from multiplying distance (in meter or feet) and aperture.

The power of the flash is measured with the GN which describes the flash’s capacity in illuminating objects within a certain distance (in meters). Modern flashes supports TLL technology that allows it to set its power according to the distance the object is to the camera, so the risk of it being too bright or too dark can be eliminated. Read the rest of this entry »

.

Related Photography Ideas for GN value at OneSlidePhotography.com

Photography Should Not Be Expensive; There are 7 Simple Photography Hacks

Indeed, there are people who agree that photography is not a cheap hobby. There should be camera, lenses, filters, flash and accessories which are all expensive or even exceedingly expensive. As a photographer with limited budget, it can be tough for you to up-grade and update your camera with such and such accessories. Even buying […]


Ten Things You Should Know about Auto Focus

The Auto Focus (AF) System in a camera found in the 1980’s is an important discovery in the world of photography and has had a major impact in bringing convenience to photographers. Without the Auto Focus, we would have to manually adjust the focus on the lens to really precisely focus on the objects we […]


Which is best for photographing in low lighting: Wide-aperture lens or flash?

An age-old question that may make the beginner photographers wonder: “Which should come first, buying a wide-aperture lens or buying a flash for photographing in low lighting?” On one hand, a fast wide-aperture lens may be more important because it can be more often used when photographing in low-lit indoors or to achieve good bokeh […]


How to Clean Your DSLR Sensor

Sensors allow DSLR cameras to capture light and produce the digital image. It is, in short, the heart of a DSLR camera. Because they are charged, they have a strong tendency to attract dust particles. Properly keeping the lens cap on when the camera is not in use would usually be enough to protect the […]


The World’s 7 Most Expensive Photographs

The following are the 7 most expensive photographs to ever be sold any where in the world. And these photos may leave you wondering as to how they can be sold at such an unbelievably steep price. 7. Tobolsk Kremlin (2009) Dimitry Medvedev, Tobolsk Kremlin (2009). Sold for USD $1,750,000 on January 2010 in Christmas […]


5 World’s Most Unique Cameras

1.Barbie Camera If you’re a fan of cameras, but don’t want to own one that looks like a camera, you have to check out these new merchandise from Barbie. Called the Fashion Photo Barbie, this camera is designed in the shape of a Barbie doll. So it’s basically a Barbie Doll with camera features. This […]


Photoshop has gone too far!

Nowadays, digital imaging becomes more common since the heaps of photo processing software thrived, which adequate to support the photographers manipulating their capture easily. However, these sophisticated things have been debating through photographers due to the process result was considerably different from the original, which us known that this could lead fall under public deception.