icon FieldMonitor: How To... copyright © 2018 Adam J. Wilt  
A wireless video monitor for iPhone

How To...

Connect FieldMonitor to a source

Tip: on iPhone or iPad with cellular, turn Airplane Mode on, then turn Wi-Fi back on. You'll improve display performance and battery life and reduce interruptions from calls, messages, and notifications.

Direct mode allows direct connection with no other hardware: you connect your iDevice to the camera’s Wi-Fi directly. Sonys always connect in this mode; Panasonics offer the choice of direct connections or the use of a separate Wi-Fi router.

Via Network uses a separate Wi-Fi router or access point. This often allows greater range because the router’s radios are more powerful, but you need to bring the router into the field and provide power. You can also operate multiple sources on the same network and switch between them without having to change the network on your iDevice.

The next time you need to connect the camera to that network, do this instead:

Hide or Show onscreen controls

Tap the screen to hide controls and data overlays; tap again to display them. To change what gets hidden, tap the control button , tap Hide, then turn hiding on or off for controls, ’scopes, markers, etc.

Show and adjust ’scopes

Tap the control button , tap Scope, then choose the ’scope(s) to be displayed. In any mode where ’scopes overlay the picture, simply drag them to new positions, and pinch them larger or smaller.

Show and adjust markers

Tap the control button , tap Mark, then tap the marker type you want to adjust: use the Show switch to turn it on or off; pick from the options shown; use Show Color / Show Controls to toggle between display and color settings.

You can change the aspect ratio and safe area options available for Frame markers in the Settings menu.

Desqueeze anamorphic pictures

Tap the control button , tap Image, then pick your lens desqueeze ratio. You can also side-crop the desqueezed image to selected aspect ratios (alternatively, you can turn on a frame marker for that ratio instead, and keep the entire image visible).

Flip the image for “mirror mode”, low-mode Steadicam, or mirror-rig monitoring

Tap the control button , tap Image, then turn on Flip V and/or Flip H as needed.

Check focus

Tap the control button , tap Image, then adjust Focus Assist Intensity to the desired level. Edge Mode controls the type of focus assist: Edge Mode off shows a standard peaking signal; Edge Mode on shows a reduced-contrast picture with a bright edge-detection signal.

Check exposure

Use the Y WFM to see where your levels are. You can use FieldMonitor to watch exposure as your camera moves through a scene, checking for overexposure. 

If your iDevice supports false color, set the false color levels to show you over- and under-exposure warnings, and/or use the green level as your target exposure value.

Otherwise, you can use false-color LUTs with camera sources; just be aware that ’scopes measure the image with the LUT applied, and a false-color LUT will cause the ’scopes to show wildly inaccurate results. Turn the LUT on for false-color, turn it off to use ’scopes.

Note that ’scopes and false-color display for Panasonic sources may not be accurate unless FieldMonitor’s levels settings match the camera’s.

Check color

Use the RGB WFMs or the vectorscope to look at color.

When the camera is aimed at a white card, gray card, or grayscale, and is properly white-balanced, overlaid red, green, and blue waveforms will superimpose and turn white. On the vectorscope, the center dot will be properly centered in the crosshairs.

When the camera is aimed at a bluescreen or greenscreen, you can adjust exposure while looking at RGB WFMs or color histograms, checking for the best separation between your key color and the subject’s colors.

Electronically-generated colorbar vectors should fall in the vectorscope target boxes at either the 100% setting (typically EBU full-frame bars, or the fully saturated red/blue/cyan/yellow patches on ARIB bars) or at 75% (SMPTE and ARIB bars).

When shooting a DSC Labs chart with a “V/S Gain x 2” marking, or a Gamma & Density Log chart or Gamma-709 chart, use the 2x setting. In an ideal world, a perfectly set-up camera will put the chart’s vectors into the target boxes. (Unless you’re using a broadcast camera this probably won’t be the case; most cine cameras, camcorders, and DSLR-style cameras use different color and tonal-scale renderings, and the vectorscope pattern often will not match the layout of the target boxes precisely.)

Use LUTs

Select up to three LUTs in the Settings menu after you have imported them. Then, in the Monitor screen, tap the control button , tap Level, and choose the LUT you want to use.

Import LUTs

FieldMonitor can import 3D LUTs in .cube format using iOS file sharing or iTunes file sharing.

iOS file sharing: Email yourself a .cube file, tap and hold it to reveal the iOS sharing sheet, and select “Import with FieldMonitor”. FieldMonitor will launch and import the LUT, after which it will be available in the Settings menu's LUT selections:

A .cube file in an email (the icon shown may vary). Tap and hold it to open the Share Sheet.

.cube files in an email

Find FieldMonitor in the Share Sheet. Tap it to import the LUT into FieldMonitor.

iOS share sheet

FieldMonitor launches, and imports the LUT.

LUT loaded into FieldMonitor

Now you can assign it to a LUT position for immediate use.

LUT ready for use

iTunes file sharing: Connect your iDevice to iTunes. In the device’s Apps settings in iTunes, scroll down to File Sharing and select FieldMonitor. Drag .cube LUT files into FieldMonitor Documents:
 .cube files added in iTunes

If FieldMonitor is running, tap Refresh on the Source Screen to read the .cube files and turn them into .fmlut files. Otherwise, FieldMonitor will read them the next time it is launched. 

.fmlut files are FieldMonitor LUTs. If you delete them while FieldMonitor is running, please tap Refresh on the Source Screen to let FieldMonitor know you’ve deleted them (otherwise, if you try to select one in the Levels controls, it will be displayed as NG—not good—and no LUT will be applied).

Where to find LUTs?

Get Help or report a problem

Please check the main support page or the FAQ in case I’ve answered your question there. If that doesn’t solve your problem, please contact me. I’ll answer as soon as I can and do my best to help you out! (If your email isn’t answered within a day or two, it may have fallen into a spam-trap; try contacting @adamwilt on Twitter instead.)

© 2018 Adam J. Wilt.  Last updated 2018.01.25