Focus "Predictor"

As I mentioned earlier , I have a little device that I misnamed a focus predictor.

 

The basic problem is this : you can only focus on the target before the pellet hits. After the pellet hits, the target becomes larger as the debris expands outwards.

 

What was in focus is now out of focus.

 

The focus predictor is a spring loaded slide that mounts to the bottom of the camera. It allows me to pre-focus my camera so that the expanding debris from the shot target will be in focus.

 

Before I worked up this little widget, I had to use the lens focus ring to back off the focus. This was not accurate or repeatable, so I would miss focus on lots of otherwise good pictures.

 

With the focus predictor, my ratio of keepers is much higher.

 

It made me happy.

 

Cheers.

2,448 views
3 faves
6 comments
Uploaded on December 20, 2010
Taken on December 19, 2010