Handy app This app is handy. It bases the no star trail calculations off of the Rule of 600 (if you prefer the rule of 500 and don't want to do the math, just shorten the time you shoot for by a bit). It also takes into account sensor size for people who shoot with a crop sensor camera or something else.
Excelent And does NOT need UI improvement.
Good Does the job and it's very useful. Need some UI improvements.
Version 1.1: Now has same features as paid app such as GPS and advanced calculators. Enabled install to SD card feature.