The Digital Photography Book  by Scott Kelby

Drown For Two Years Long, This Memory Card Survived!

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

A Brief History of Canon Cameras

The Most Phenomenal Selfie Photos!

Canon DSLR Picture Style: Free Download Kevin Wang Picture Style

Photography PDF: Digital Portrait Photography For Dummies

Tips for Shooting Macro Photographs of Insects

Tips For Taking Photos From Airplane’s Window

Common Mistakes in Cleaning a Camera or Lens

Understanding GN Value and how it’s Calculated

Posted by oneslidephotogaraphy On October - 10 - 2020

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 calculating GN at OneSlidePhotography.com

Photography Mistakes You Should Avoid When Travelling

Travelling is an exciting experience, even months after when you’re home skimming through your travel’s photo album. But your photo collection will look boring if you only took run-in-the-mill touristy photos that look like postcards you can easily get at airports and bookstores. Here are some things you should avoid as a photographer when travelling […]


How to Change the Lens Safely

One of the advantages of a DSLR is that the user can interchange different lenses on the camera body to achieve a variety of photographic effects. DSLR cameras have a release mechanism to change lenses quickly and easily so you don’t miss that perfect photo. Here are some technique to change DSLR lenses. The advantage […]


Download : User’s Manual – D3100 – Guide to Digital Photography

The D3100 is built around a 14.2 megapixel CMOS sensor, bringing not only live view but also Full HD video capture to Nikon’s entry-level model for the first time. In fact, this made it the first Nikon DSLR to offer 1920×1080 movie recording. It can only record clips up to about ten minutes long (due […]


Download Photography PDF: Wedding Photography Checklist

You’ll want to remember every part of your big day. Print this list for your wedding planner. Feel free to personalize this list with your own special requests.


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:


The Dreamy Camera Café, a Café For Photographer

The following is a very special café which is really like no other. This unique cafe is located six miles to the east of South Korea in Yangpyeon district. Customers may drive on their own cars in order to reach the location or take a train from Seoul. Though the distance is quite far, yet […]


Photography ideas: Out-Of-Focus Photography

Many beginner photographers think that a good photo can only be obtained by using a sharp lens that produces sharpness right to the edge of the frame. There’s truth in that, but it’s not always so. A sharp image without a sharp message doesn’t amount to much of a photograph. What would make a better […]