The DSLR Filmmaker Toolkit is a collection of useful utilities designed for the modern filmmaker, contained in one app. This app has just received a minor update with the viewfinder tool calibrated for the iPhone 4S. You can read further about the features of this app below. It retails for $7.99/£5.49 and you can download it here. Slate Tool The Slate tool is an electronic clapper board designed with the DSLR filmmaker in mind. The most important information can be edited directly on the slate itself: To change the ‘take’ tap the + or – buttons. To reset the ‘take’ value back to 0, tap and hold over the number…