Please check out the new toolstud.io. Eventually all the tools you find here will be transferred to toolstud.io video and photo tools

This is a collection of web-based tools for calculations that are related to HDSLR video or cinema.
Frame duration: calculate # of frames to/from duration and framerate
Frame rate conversion: calculate conversion from one framerate to another
Aspect ratio calculator: calculate megapixels, aspect ratio, letterboxing.
File size calculator: calculate megapixels, frame and video filesize estimations.
Depth-of-field calculator: calculate and visualize depth-of-field.
Composition calculator: calculate and visualize frame composition.
Light calculator: calculate required/allowed light