It is predominantly aimed at cinematographers shooting on both film and video, but is of some use to still photographers as well.
The current release is v0.5.4 ("Lucy").
The Select Camera spinner will be empty to begin with, as you've not added any to the library yet.
To add a new Camera, press the New button beside the spinner.
A dialog will pop up in which you can enter a name to identify your camera.
Below that is the Maximum Circle Of Confusion box, and then two boxes that define the width and height of the Image Plane for your camera. You can set these manually, but typically you'd just use the spinner below them to set all three parameters according to one of the standard formats in the Standard Guage spinner, such as the Super 16mm film format, the 1/3" sensor common in many digital video cameras, or full 35 mm frame. [If there is a common format you'd like to see, let me know and I can add it].
Once you're happy with your settings, press the OK button to save them.
Notice that your new camera has been added to the Select Camera spinner. Tap the spinner to select which of your saved cameras to use.
You can edit the parameters of a camera by selecting it, then tapping the Edit button, which will open the camera dialog for you to make your changes. You can get rid of a camera you don't want any more by selecting it then tapping Delete.
In the Lens dialog, you can again enter a descriptive name for your lens.
Below that you can enter the Minimum Focus, or minimum object distance, for your new lens.
Below that is an admittedly horrible interface* for setting up the Focal Length markings (or any other common focal lengths in which you're interested) for your lens. Typically you'd want to add at least the minimum and maximum focal length of your lens. By default, you'll start with a single entry of 50mm. To add new focal lengths, enter it in the box, then tap Add. The new focal length marking will be added to the string of Focal Length marks. To remove an entry, enter the focal length and tap Remove. You have to have at least one focal length mark; thus, you won't be able to remove the last one.
Below the focal length marks, you can set the Minimum and Maximum Aperture (or f-stop) for the lens. At present, there is no mechanism to deal with f-stops and T-stops**. For now, use f-stops, since this is the correct measurement on which to base depth of field calculations.
* This will be remedied in the relatively near future. :-)
** This will also be remedied at some juncture.
Tap on the Optics tab to see the DoF diagram.
Above the diagram, your currently-selected camera and lens are indicated. If you have not created a camera yet, the default is to diagram a standard 35mm camera (135 format). If you've not yet set up a lens, you'll be viewing a standard 50mm lens.
The diagram itself shows a variety of information. We'll get to that in a minute; first we'll look below the diagram at the controls available, which correspond to the focus, focal length, and aperture rings on your lens.
Immediately below the diagram are the Focus controls, to set the Focal Distance. A desired Focus Distance can be entered directly into the text box, or incremented/decremented by the buttons on either side. The inner buttons nudge the distance by 1%; the outer ones by 20%.
Below that are the Focal Length controls. Again, the focal length can be manually entered into the box, or can be manipulated with the surrounding buttons. The outer buttons move the Focal Length up to the next marking (remember, from the Lens dialog?). The inner ones nudge up or down 1mm at a time.
The lowest group of controls are the Aperture or f-stop controls. A value can be entered directly in the text box. The outer buttons open and close the aperture by one full stop, and the inner ones move by a third of a stop.
Focus Limits: Your current Focus Distance is marked by the heavier red vertical line, and its value is labeled along the bottom axis. To each side of this is a lighter red line. These are the Minimum and Maximum Acceptable Focus Distance, respectively. Their distance from the image plane is also marked along the bottom axis. Everything that falls between these two distances is considered "acceptably in focus".
Depth Of Field: The distance between the Minimum and Maximum Acceptable distance lines is called the total Depth Of Focus, and is represented by a light blue line. The total depth of focus is labeled roughly at the mid-point, above the line. The distances in front of and behind the Focal Distance respectively are marked below the line, along with their percentage of the total depth of field.
Hyperfocal Distance: Along the top axis is a series of light green ticks. The furthest (right-most) of these is called the Hyperfocal Distance, and is labeled. The hyperfocal distance is the point of maximum depth of field; a lens focused at this point will acceptably focus everything between half the hyperfocal distance (represented by the second furthest tick) and infinity.
Interestingly, the Hyperfocal Distance (Fh) yields an entire series of distances Fn = Fh / n, for any n. A lens focus at any Fn will acceptably focus everything between Fn+1 and Fn-1. The green ticks represent this series of fractions of the Hyperfocal Length, and can be used to roughly gauge the depth of field throughout the range.
Angle Of View: Finally, above the little camera icon at the far left are the Horizontal and Angle Field of View for the current focal length, labeled in yellow text, and roughly diagrammed.
*If you care about geeky things, the scale is based on the arctangent of the focus distance
Before logging shots, you'll probably want to set up a project to keep your shoot organized.
Press the Menu key; select Projects from the main menu.
Don't use this to white-balance your camera!*
This may disappear or be moved in future releases to accommodate new functions.
*One of Acacia's friendly competitors features a gray card feature - which does not make a lot of sense to me. (But other than, it's a very cool app, and you should check it out!)
If you do continue to have problems, please do take the time to let me know!
Backup options and exporting to a convenient format will be supported soon, too.
I have some ideas for completely new features, that I hope will see the light of day in the not too distant future.
Drop me a line at android at this domain name!
Aurélien, Greg, Komtur, Phil, Mark, Tobias, Derek, Raphael & Jonno for the feedback & encouragement!