About this application and "Allow to store locally"
This web application uses HTML5's "manifest cache" feature to store the web page locally on your computer if you want to, so you can run the application later (say, if you are on a plane and don't have internet).
I have not yet figured out how to use a cache validator yet, so "Allow"-ing this page to be stored locally, well, I don't know what would happen if a newer page came along - I guess you could try the refresh button and hopefully it will update?
You don't have to press the "Allow" button if you don't want to, this DHTML web application doesn't talk to any servers.
It will run just fine if you don't press "Allow" as you can see, it doesn't need to be cached. I enabled application cacheing only for your convenience.
Overview
Higher end and older mid-to-low-end digital cameras are 4:3 (SD). newer low-to-mid-end digital cameras are 16:9 (HD). Video cameras such as camcorders can be either 4:3 (SD) or 16:9 (HD). Some camers (video and digital) can do both 4:3 (SD) and 16:9 (HD).
What is meant by 16:9 and 4:3 is the ratio of x:y or horizontal:vertical sometimes size-wize of the image sensor,but always of the output format.