Where I do most of my camera trapping, I'm trying to obtain pictures of local fauna such as Brush-tailed Phascogales, Bush Rats and Agile Antechinus. It can be difficult to distinguish between a Bush Rat and an introduced species (see Museum Victoria's explanation) and between the Agile Antechinus and the House Mouse. I wanted to get closer shots with higher definition so I could see more detail of the animals, but the cameras I was using (Scoutguard 550 series) wouldn't focus at a close enough range.
I had been using a custom made camera box to get closer shots with good contrast. The box provided a very controlled environment for triggering the camera and getting good photos of small mammals, as well as the occasional lizard. However, the photos were a bit blurry because the box was shorter than the camera’s normal focus range. After some thinking, research and internet digging, I found some corrective lenses which would bring the focus range down to less than 1 m. In fact, I can get photos as close as 15 cm. This allows the camera to be used for some interesting projects, such as nest box monitoring, surveying for small mammals, reptiles and even insects (although the last is best in time-lapse mode).
What can be achieved with a close focus lens
Photos can be joined to make a video showing behaviour