ALEX VENDLER D.P.
To get started, choose your mode with the switch on the top left of the main screen. The default “directors finder” mode gives you an accurate viewfinder that allows your iPhone to reproduce the field of view of any lens based on user entered sensor dimensions. In “Rangefinder” mode users of legacy film cameras get an accurate parallax corrected viewfinder! More details on Rangefinder mode coming up in paragraph 3.
To add a custom camera or lens set tap the name at the top left or right of the screen to enter the edit menu, then tap “+” to create a new one. For cameras, enter the sensor (or film back) dimensions in millimeters. If you are doing a slight crop for VFX, a stabilization pad, or shooting a unique aspect ratio, you are going to need to enter custom sensor dimensions. Using the camera manufacturer’s sensor size data enter the sensor dimensions for the image you want to view. Leave all the “offset” values at zero because those are for those parallax correction users we will talk about in paragraph 3. To add a custom lens set, input a name then add the focal lengths separated by commas in the lens list box. Swipe left on any existing camera or lens set name to edit or delete it. For anamorphic lenses simply multiply the vertical sensor dimension by your chosen aspect ratio to simulate anamorphic focal lengths. For example, shooting a 2.35 aspect ratio with a 17.7mm vertical sensor dimension, one would use a 41.6mm horizontal dimension to simulate anamorphic lens focal lengths. In prime mode “+” and “-“ buttons will appear so you can step thorough the lenses in your list. Turn off prime mode to free zoom at any time and activate prime mode again to snap to the nearest prime in your set. Free zoom is limited to 12mm to 200mm virtual focal lengths, but if you need more range just add any focal lengths to a lens set and you’ll be able to access them in “prime” mode. Image junky has only “Super 35mm 16x9” and “Full Frame 35mm" sensor sizes pre loaded so you don’t have to wade through a bunch of menus containing equipment specs you aren’t using. Just enter the camera and lens data that you need and go! This makes the app open instantly and work more smoothly. To save a frame with lens and camera name information included to your iPhone's camera roll, tap the “Camera” button the left of the screen.
Here we are at paragraph 3! In “rangefinder” mode, Parallax camera users will be able to enter the offset distances between the mounted iPhone camera lens and the main lens (“taking lens”) of your film camera. These values can be entered when creating a custom camera or added later using the swipe to edit function. Use a ruler and measure the horizontal and vertical distance between the iPhone’s medium lens and the center of the lens of your film camera (taking lens) in centimeters. If your taking lens is below the iPhone, the vertical input will be a negative value. When viewed from the back, a distance to the right of the film camera’s lens is a positive value and to the left is a negative value. For the “Z” value, measure the distance from the film camera lens’s entrance pulpil and the iPhone lens. A rule of thumb puts that point 1/4 of the way back from the front of the lens but you’ll have to test if you need it dead accurate. A typical set of values for an iPhone mounted with its lens above and to the right of a common 50mm prime lens might be: “Vertical=-9cm, Horizontal=6.5cm, “Z”=10cm”. You may need to adjust these values a bit to account for errors in your mount system or other inconsistencies in the setup, but you’ll be surprised how close you get and how much better you can frame things. As a bonus feature you can use the live distance info to set focus. It’s accurate to 5 meters and reads “infinity” after that. For bellows cameras you may have to have a separate camera in the list that has a larger “z” value for close focus situations. “Image Junky” will hopefully offer some iPhone mounts in the future that will help parallax camera users mount their iPhones to an array of different camera creations old and new.
Please email firstname.lastname@example.org with feedback and questions. We’ll do our best to answer any questions and take user suggestions for updates.
Thanks for being a part of this project and I hope it makes cinematography and photography even more fun.