What Photographers should Know: Focal Plane Mark

What is the Effect of Activating Image Stabilization When We Use Tripod?

Camera Capture

Tips on Outdoor Portrait Photography

Photographer’s Etiquettes You should Know About

Shooting Extraordinary Photograph Using Wide Angle Lens

5 Common Rookie Mistakes when Buying a Camera

The Most Phenomenal Selfie Photos!

Everyone Can Be a Good Photographer!

Tutorial: Creating a Panorama Photo using Adobe Photoshop

Understanding GN Value and how it’s Calculated

Posted by oneslidephotogaraphy On December - 21 - 2016

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 how to calculate guide number at OneSlidePhotography.com

Beginner’s Guide to Photography : Controlling Depth of Field

Depth of field refers to the range of distance that appears acceptably sharp. It varies depending on camera type, aperture and focusing distance, although print size and viewing distance can also influence our perception of depth of field.The depth of field does not abruptly change from sharp to unsharp, but instead occurs as a gradual […]


These Are the Reasons Why a Photographer Must Have His Own Website on Photography

What is the first thing to do when you want to find the most recent information? Like looking for price list of a product or inspiration to create unique photo? It is almost infinite that every one of you will look for the answers of those things on internet. Apart from the fact that they […]


The Most Iconic Photographs in History

This iconic 1957 Richard Avedon photo, “Marilyn Monroe, actress, New York,” is now in the collection of New York’s Museum of Modern Art. Today the museum announced its acquisition of 39 Avedon photographs, more than doubling its collection of the late photographer’s work. “We are very grateful…for the cooperation of The Richard Avedon Foundation, which […]


Tips: Caring for and Storing Photographs to Maintain Quality

A photograph can be very valuable because of the image that it depicts. It may be of a once-in-a-lifetime moment or of a time and place you once loved. But over time, the aging process of a photograph is inevitable. If not stored correctly, a photo can be damaged over time and you may lose […]


What You Should Keep In Mind About DSLR Camera’s Memory Cards

Do not blindly rely on a memory card based on its brand. I’ve once bought a highly recommended memory cards, and it broke two years after. The brands usually brag on its long life, but it’s better to focus on brands with convenient after-sale service from the memory card’s seller or producer because memory cards […]


Beginner Photographer’s FAQ

– I want to create photographs with blurry backgrounds, how do I achieve such a feat? Answer: The trick to doing so has been previously discussed in this post. – I’m using a kit lens and I’ve set the aperture to its widest exposure, how come the background isn’t blurry? Answer:


Tips for Using and Caring for Memory Cards

One of the greatest fears of a photographer is to attach the memory card to the computer only to find that it has been damaged and all of the images have been lost. To protect against this disaster it is recommended that you test your memory card on a regular basis. This can be done […]