# How to protect your gear at a color festival

Shooting at a color festival is a great occasion top take beautiful portraits, but you must be aware that the color powder is a threat for your lens and camera.  The powder is as fine as flour and will enter through any gap or unsealed join. It is in fact made of rice or corn flour so at least it is not harmful for yourself.  In this article I provide advices to keep your equipment perfectly clean and safe during such an event.

I also invite you to have a look at the pics I took during color festival. I show a limited selection on this website but you can see the full album on my Flickr : https://www.flickr.com/photos/damienfournier/sets/72157646901592626/

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# Photographs from the Holi Fusion Festival in Eindhoven

The last week end I had the opportunity to shoot for the Holi Fusion Festival in Eindhoven. The Holi fusion is a music festival inspired by the Indian Holi festival, where people throw color powder at each other.

This was a unique opportunity for colorful portraits and party pictures, and a great fun to be there as a photographer. So I literally took hundreds of portraits, exhausted my battery and filled my memory card. I show a limited selection on this website but you can see the full album on my Flickr : https://www.flickr.com/photos/damienfournier/sets/72157646901592626/

Also in a following article I will describe how you can protect you photography equipment during such an event.

# The simplified Formula of Depth of Field

The common photographer knows that the Depth of Field varies with the aperture, focal length and subject distance. But which one is the dominant parameter ? And how much is the influence of each parameter ? This article uses the equation of the DoF, and demonstrates that when the DoF is short, it varies proportionally with the aperture, and with the square of the focal length and distance to subject.

So here comes the only formula you need to know when you deal with short DoF but not macro photography :

```
- A is the aperture number
- c is the circle of confusion
- f is the focal length
- s is the subject distance
- H is the hyperfocal distance
- DoF is the depth of field```

In the rest of the article you can read where this simplified formula comes from, what it means in practice, and how accurate it is compared to the exact formula of DoF.