Gx FoCalc vs TetherCam

FoCalc by [Gx]Ace Is the internet's best 35mm Crop Factor Calculator. Ever wonder what the 35mm equivalent of a 23mm f2 on APS-C would be? Ever wonder what that 120mm f8 8x10 lens would be if it were put in 35mm terms? Well now you can know it all with FoCalc! FoCalc allows you to input a focal length and aperture as well as a focal reducer or teleconverter and automatically calculates the equivalent focal length and apparent aperture on 35mm Full Frame.

Your iPhone, instead of a webcam. TWO APPS, ONE CABLE TetherCam is two free apps. TetherCam for Mac is downloaded from tethercam.app; TetherCam for iPhone is this one. Install both, connect the phone to the Mac with the USB cable you already own, and the iPhone shows up as the camera "TetherCam" on the Mac, in the same camera picker as the built-in one. It works in every Mac app that lists system cameras: Zoom, Microsoft Teams, Google Meet, FaceTime, QuickTime Player, Safari, Chrome and the rest. Zoom and Microsoft Teams were verified on 10 September 2026. Nothing travels over Wi-Fi, nothing passes through a server, nothing is uploaded anywhere. There is no account, no pairing code and no discovery step. The cable is the whole path, which is why the picture stays stable in a crowded room where wireless cameras start to stutter. WHAT YOU NEED An iPhone with iOS 17 or newer, a Mac with macOS 14 or newer, and the USB cable that came with the phone. The free TetherCam Mac app asks once for approval of its camera extension in System Settings; after that the camera is simply there. THE HONEST LIMITS The Mac app carries the picture only. A Mac camera extension has no audio stream, so the sound stays with the Mac's own microphone. Audio over the cable exists, but only on the OBS path below. This iPhone app stays open in the foreground while it sends. The phone serves one receiver at a time. The Mac app and the OBS plugin are not used together; whichever connects second is told that the line is busy. ON THE PHONE Live preview from the moment you open the app, before anything is connected. A camera and lens picker for the wide, ultra wide and telephoto lenses or the front camera, switching the stream immediately. Automatic rotation that follows the horizon rather than the interface. Turn the phone and the picture stays level, because the orientation is resolved on the capture side. There is a manual angle override when you want to decide yourself. Hardware HEVC encoding, which keeps the phone cool and the latency low. A diagnostics panel that shows what is actually happening: listener state, connection, frames per second, bitrate and the measured levelling residual. FOR STREAMING AND RECORDING: OBS STUDIO The TetherCam plugin for OBS Studio is the pro path, also free and also at tethercam.app. It adds a source called TetherCam directly in OBS, finds the phone through the same cable, and it is the only path that brings the microphone of the phone across as well. PRIVACY No account, no analytics, no advertising, no purchases. The camera picture goes to your own Mac and nowhere else. Nothing is collected. TetherCam for iPhone is free and open source under the MIT licence at github.com/Kanevry/tethercam.