With this application you can do two things:

- Calculate the exposure time in a long exposure night photography.

- Calculate the hyperfocal distance in a photograph.

Just enter the data and get results quickly and easily.

One of the necessary data is the circle of confusion. This is a different number for each manufacturer and type of camera. Nikon DSLRs generally have a value of 0.020 and 0.019 for Canon but for sure the value of your camera visit this page:

http://www.dofmaster.com/digital_coc.html

You can also do a search on the web to get this value.