Lens Grid Guide & Generator

Read how to shoot useful, data-rich, lens grid images. Includes our lens grid generator so you can make and print your own PDF lens grid.


Rectify Lens Grid: Just fix it!

Rectify Grid is a new capability to "just fix" arbitrarily distorted lens grids, producing STmap image distortion maps. In addition to describing that, the tutorial discusses creating and shooting lens grids, no matter how or what will process them, in hopes of addressing the plague of disastrous lens grids that customers receive to be analyzed. Crucially, lens grids must reach the image's edges!

2022-03-22. 7:28 long.

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Determining True Field of View and Focal Length

This tutorial shows what the field of view produced by SynthEyes corresponds to, and introduces a new script that produces numbers that are comparable to lens barrel values and spec sheet numbers --- and also the sensor size value required for any of those numbers to have plausible accuracy.

2023-04-14. 6:24 long.

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Anamorphic Solve Using a Lidar Scan

This extensive, detailed, tutorial shows an anamorphic shot being locked to a lidar scan. The resulting solve is used as a starting point for several additional tutorials. This process can also be used for non-anamorphic shots; for example matching architectural models to drone shots (using a standard radial lens model).

2023-04-14. 24:53 long.

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Export to Nuke with Anamorphic Lens Distortion

Runs through the many new features of the Nuke exporter in SynthEyes 2304, including distortion export to Nuke Lens Distortion nodes (not STmaps) using overscan rendering if the Lens Workflow script has not been run; supporting both 1- and 2-pass workflows if it has. Other features include projection screens, auto-run, paste-to-clipboard, and New 3-D support.

2023-04-14. 11:20 long.

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Handling Animated Distortion on a Shot with Zoom

Shows how SynthEyes's lens parameter solving modes can be used to determine animated lens distortion parameters on a shot with a large zoom. "Animate on keys" mode allows a tailored distortion curve, preventing the animated distortion parameters from introducing jitter into the solved shot.

2023-04-14. 7:01 long.

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Focus Breathing - Lens Grid with "Animate by Frames"

Shows a rack focus shot of a lens grid being analyzed using "animaate by frames" parameter solving mode to examine the horizontal and vertical scaling changes produced by lens focus breathing. This process can be used on simple but frequently encountered shots such as a hand-held but static shot of an actor, with a change in focus.

2023-04-14. 11:13 long.

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Focus Breathing - Live Shot with "Animate on Keys"

This follow-on focus breathing shot looks at a somewhat more realistic shot, using the "Animate on Keys" lens parameter solving mode to control parameter jitter when there are fewer trackers available.

2023-04-14. 12:15 long.

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Anamorphic Distance: what the heck?

Discusses anamorphic distance, an optical feature of anamorphic lenses with significant, but little understood, impact on matchmoving and graphics, which can explain a number of their unusual properties. Shows how SynthEyes can calculate it, how it can be compensated for, what that looks like, and how it can be handled in downstream applications.

2023-04-14. 14:14 long.

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New Lens Solving Features in SynthEyes 1806

Shows how to solve shots with more distortion distortion, such as from action cams and drones, using the cubic and quartic solving in SynthEyes 1806. Discusses how to monitor overfitting using canary zero-weighted trackers. Finally, shows exporting the scene to After Effects using the AE distortion plugin, which is updated for 1806.

2018-06-27. 23:06 long.

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Lens Master Calibration

Walks through various options of the Lens Master Calibration script while calibrating a somewhat distorted lens (Canon 24-70mm L at 24mm), especially the results of the different workflow selections.

2017-02-15. 13:57 long.

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Fisheye Calibration with Straight Lines

Shows how to calibrate a fisheye lens from live shots that contain a number of straight-line features. While the technique is generally useful, even for non-fisheye lenses, this particular tutorial shows the additional steps required for "full-circle" fisheye lenses, where the image is vignetted and does not extend to the edge of the rectangular image plane.

2017-02-15. 20:31 long.

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Random-Dot Calibration

Shows how to do lens calibration using a novel random-dot method that generates a very dense data set for accurate calibration, including a full 360 degree scan that guarantees an accurate field of view. This technique is intended for reference calibrations to examine equipment and techniques carefully, not for calibrating shoots out in the field.

2017-02-15. 30:39 long.

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Lens Centering from Vignetting

Shows how to determine the optical center by intentionally causing vignetting. This can be done easily and accurately in the field using a nesting collection of filter step-down rings. This technique is especially useful when the lens has little distortion.

2017-02-15. 6:38 long.

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One-Pass Lens Distortion Workflow with After Effects Export

Shows a shot with lens distortion being tracked and solved in SynthEyes, then the one-pass lens workflow being used and the scene exported to After Effects. The one-pass workflow produces shots with no lens distortion (ie it has been removed) for delivery to the client. Includes adding a small flag in a 3-D layer to the shot. Shot credit: Arnie Itzkowitz, Aerial Exposures.

2016-01-15. 9:04 long.

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Two-pass Lens Distortion Workflow with After Effects Export

Shows the two-pass lens distortion workflow, which allows you to composite 3-D effects over the original footage with distortion. Here, a shot is tracked and 3-D solved, then a planar tracker added before proceeding with the lens workflow and export. Shows the undistorted and redistorted comps within After Effects. Shot credit: Arnie Itzkowitz, Aerial Exposures.

2016-01-16. 14:28 long.

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Lens Grid Auto-Calibration

Introduction to the lens grid auto-calibration system in SynthEyes, which analyzes footage of a lens grid pattern to produce accurate lens preset information.

2011-12-07. 8:20 long.

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Using a Lens Preset

Shows how to use SynthEyes's lens calibration system to calibrate a lens, and apply that calibration to a shot. Shows the before and after of an autotrack of the scene.

2011-12-07. 5:23 long.

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Lens centering and Distortion

Advanced tutorial looking behind the scenes at lens centering and distortion.

2009-07-17. 14:55 long.◆◆◆

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Lens Distortion White Paper

Lens distortion white paper: the actual mathematics of SynthEyes's lens distortion algorithms

2009-07-17. ◆◆◆

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Lens Distortion and Anamorphic Padding White Paper

This "white paper" shows some of the workflow details involved with lens distortion and anamorphic plate handling, where you may need to repeatedly modify initial settings.


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2011.1 Lens Auto-Calibration Grid (OLD)

Download the 36x27 inch lens grid and print it at most copy shops such as FedEx Office (Kinkos). Use this for 2011.1 lens grid auto-calibration.


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AE/SE One-Pass Distortion Workflow (OLD)

Tutorial shows the manual setup of a SynthEyes Undistort node in AfterEffects, to match the distortion and scale computed by a solve followed by using the 1-pass option on the Lens Workflow button (SynthEyes Summary panel). With this setup, you can use AfterEffects to undistort your footage, rather than the SynthEyes image preprocessor.

2012-01-05. 4:30 long.

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AE/SE Two-Pass Distortion Workflow (OLD)

Shows the two-pass workflow, where a lens distortion calculated in SynthEyes is used to configure both SynthEyes Undistort and SynthEyes Redistort effects in AfterEffects. With these nodes and this workflow, you can use AfterEffects (instead of SynthEyes) to convert your distorted footage to clean footage for tracking and 3D work, generate CGI effects that match the clean footage, then use the Redistort node to composite the CGI effects back to the *original* footage, so that you can deliver footage with higher quality,

2012-01-05. 9:12 long.

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AE/SE Advanced Distortion Effect (OLD)

Shows the use of SynthEyes's "Advanced Distortion" effect (pixel bender) in AfterEffects. This effect is able to reproduce the complex distortion types, including off-centering and high-order (fisheye) distortion computed by SynthEyes's lens-grid-based calibration tool.

2012-01-05. 12:05 long.

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AE Undistortion by 3D Export (OLD)

Quick review to complement the other AE/SE pixel-bender tutorials. SynthEyes Undistort nodes are automatically generated as part of an export of the 3D scene from SynthEyes to AfterEffects. This tutorial shows that in action and what the result is.

2012-01-05. 3:04 long.

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Workflow for delivering undistorted images

Shows lens distortion workflow to produce undistorted images.

2009-07-16. 5:16 long.

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Workflow for delivering distorted images

Shows lens distortion workflow based on re-distorting and compositing with the original image.

2009-07-16. 5:49 long.

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SynthEyes easily is the best camera match mover and object tracker out there.

Matthew Merkovich

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