Set the app's de-squeeze control to match your anamorphic lens's squeeze factor, then confirm the live viewfinder shows normal proportions before you record. Start by finding the factor printed on the lens or in its manual, open the monitoring app's anamorphic controls, and select that exact value. Once the preview looks correct, test a short clip to see whether the app corrects only what you see or also the file you keep.
Understanding how to de-squeeze anamorphic video in monitor apps on smartphone rigs ensures you frame every shot accurately without guessing at widescreen boundaries.
How to De-Squeeze Anamorphic Video in a Smartphone Monitor App
Follow this sequence in order, since each step depends on the one before it.
- Identify the lens squeeze factor. Check the lens barrel, packaging, or manual for the stated factor (commonly a ratio such as 1.33x or 1.5x). This number, not a guess or a nearby preset, is the value the app needs.
- Open the app's anamorphic or monitoring controls. In ProCamera's documented iPhone/iPad workflow, this control lives on the second page of the control panel and is built specifically for anamorphic lens support.
- Select the matching de-squeeze factor. Choosing the same number as your lens tells the app how much horizontal stretch to apply to the live image.
- Verify the live geometry. Look at straight lines, faces, or circular objects in frame. If they look natural rather than pinched or stretched, the preview is corrected.
- Confirm the saved-file behavior before your real take. Record a few seconds, then check whether the app's playback matches the corrected preview or whether the underlying file is still squeezed. This distinction matters enough to cover on its own further down.
If you're rigging the phone for a longer setup, a smartphone rig with dual handles can keep the frame steady while you compare the live image against reference lines during this check.
Why Anamorphic Video Looks Stretched in a Phone Preview
An anamorphic lens squeezes the image horizontally onto the sensor to capture a wider field of view than the sensor's native shape allows. Until the app applies the inverse correction, everything in the raw preview looks unnaturally tall and narrow: faces appear elongated and round objects look like ovals.
De-squeeze is a display correction, not a resolution boost. The app stretches the image horizontally on screen to restore normal-looking proportions, but it isn't recovering detail the lens and sensor didn't capture. Once the correction is applied, the monitor shows what the final widescreen frame should look like, which is why checking this preview before recording matters more than trusting a default view.
A grip that keeps the phone steady while you check this geometry, such as a MagSafe camera grip with shutter control, can make it easier to hold a consistent angle while comparing straight lines in the frame.
Check Whether De-Squeeze Changes the Saved Video
A corrected live preview does not by itself prove the saved file has changed. Some apps only adjust what you see on screen or in playback, while the underlying video stays squeezed until you export or edit it.
ProCamera documents this distinction directly: its album de-squeeze toggle affects how a clip plays back inside the app, but it does not stretch the actual video file. The saved clip still needs the same correction applied later in an editor or another compatible player. The FiLMiC Pro v6 manual similarly documents a preview-only de-squeeze option for a named Moondog anamorphic adapter workflow, meaning the correction shown while filming does not necessarily carry into the exported file for that setup.
Because this behavior depends on the specific app and version, record a short test clip and reopen it the same way you plan to review or export your real footage. If the geometry still looks squeezed outside the live viewfinder, plan on a post-production correction step. A cold shoe phone holder can free up a hand for this playback check without breaking down your camera setup between takes.
Troubleshoot a Wrong Factor, Crop, or Missing Control
Most anamorphic preview problems trace back to one of four causes, so check them in this order rather than guessing at a fix.
- Geometry still looks distorted: Recheck the selected factor against the lens's stated value first. A nearby preset that "looks close" is not the same as the documented factor, and even a small mismatch will leave faces or circles slightly off.
- Image is cropped or letterboxed: If the factor is confirmed correct but the framing still looks wrong, check the app's crop, fit, or input-aspect setting separately. These are framing controls, not de-squeeze controls, and they can distort the shot independently of the squeeze factor.
- App has no anamorphic or de-squeeze control: Not every monitoring app exposes this feature. Switch to a documented compatible app or monitoring workflow for that shoot, or plan to apply the correction in post-production instead of assuming the uncorrected preview is close enough.
- Saved clip doesn't match the corrected preview: This points back to the preview-versus-file distinction above. Treat the live correction as a monitoring aid only until you've confirmed the export or edited file separately.
FAQs
Can any smartphone monitor app de-squeeze footage from any anamorphic lens?
No. An app can only produce a correct preview when it exposes a factor that matches your lens, either as a preset or a documented custom-factor option. If the app you're using doesn't offer that match, switch to a monitoring workflow that does support your lens's factor, or record with the raw squeezed image and correct it in post-production instead of assuming an unrelated preset will look right.
Does de-squeezing the preview increase video resolution?
No. De-squeezing is strictly a horizontal display scaling adjustment to restore natural visual proportions on screen. It does not generate new image detail, sharpen pixels, or alter sensor resolution beyond the optical image projected onto the camera sensor.
How can I verify if my saved video file is still squeezed?
Open the recorded clip outside the recording app's internal viewer, such as in your phone's native gallery or a desktop video player without auto-anamorphic flags. If subjects appear vertically stretched or squished horizontally, the underlying media remains squeezed and requires pixel aspect ratio expansion in an editing application.
