Teleprompter Beam-Splitter Glass Replacement

Updated August 30, 2026 · Hardware guide

Quick answer

Best fit	Repairing or upgrading an existing beam-splitter teleprompter rig
Typical cost	Low relative to a new rig, and much cheaper than replacing the whole prompter
What matters most	Matching the reflection-to-transmission behaviour, not just the dimensions
Skip it if	The frame or mount is also damaged, in which case pricing a whole rig is sensible

What this setup is really for

A beam-splitter does two jobs at once: it reflects the script from the display below up toward your eyes, and it lets the camera shoot through it with as little degradation as possible. Those two jobs pull in opposite directions. More reflectivity means a brighter script and a dimmer, less clean image; more transmission means the reverse.

That balance is why substituting ordinary glass, acrylic, or a household mirror does not work. A mirror reflects but does not transmit, so the camera sees nothing. Plain glass transmits but reflects too weakly to give a readable script, and untreated sheets often produce a visible double image because both surfaces reflect.

Dimensions matter too, but they are the easy part. Measure the existing pane including the portion held inside the frame, note the thickness, and check how it is retained. The harder question is optical: getting a replacement whose reflection and transmission behaviour matches what the rig was designed around.

Where it fits — and where it does not

Works well for

Rigs with scratched, chipped, or cracked glass but a sound frame
Older prompters where the coating has degraded and the script has gone dim
Setups suffering from ghosting or double images caused by unsuitable glass
Anyone who bought a rig secondhand without its original pane

Struggles with

Frames with damaged retention clips, where a new pane will not seat securely
Rigs whose original glass specification is unknown and undocumented
Improvised replacements from generic glass or plastic sheet

What to check before you buy

Type	A true beam-splitter, not a mirror and not plain glass
Optical balance	Enough reflection for a readable script, enough transmission for a clean image
Ghosting	Untreated or unsuitable panes commonly produce a visible double image
Dimensions	Measure the full pane including the part hidden inside the frame, plus thickness
Handling	Coated surfaces are directional and scratch easily; note which face goes toward the display

Beam-splitter teleprompter glass reflecting a script while passing a clean image to the camera

Once new glass is fitted, put text on the display and look for a faint second image — ghosting is the fastest way to spot an unsuitable pane.

Setting it up

Measure the old pane completely
Remove it carefully and measure width, height, and thickness, including the edges that sit inside the frame. A pane sized to the visible area alone will be too small to retain.
Identify the rig or its original spec
Manufacturer replacement panes remove the guesswork entirely. If the rig is unbranded, match against the pane you removed rather than guessing from a generic listing.
Check for a coated side
Many beam-splitters are directional. Note which face pointed toward the display before removal, and install the replacement the same way round.
Test for ghosting before committing
Set the rig up, put text on the display, and look for a faint second image offset from the first. Ghosting means the pane is wrong for the job, regardless of how well it fits.
Verify the image through the glass
Shoot a short test and compare it against footage without the prompter. Look for haze, colour shift, and reduced contrast, all of which indicate a poor-quality pane.

Common mistakes

Substituting a mirror

A mirror reflects the script perfectly and lets no image through to the camera. It is the most common improvised replacement and it never works.

Using plain or picture-frame glass

Plain glass reflects too little for a readable script and its two surfaces produce a double image. It fits the frame and fails at the job.

Installing a coated pane the wrong way round

Directional coatings behave differently depending on orientation. Note the original orientation before you remove the old pane, not after.

Frequently asked questions

Can I use a normal mirror to replace teleprompter glass?

No. A mirror reflects almost all the light and transmits almost none, so the script would look bright and the camera would see nothing through it. Beam-splitter glass exists precisely to do both jobs at once.

Why is my replacement glass showing a double image?

That is ghosting, and it usually means the pane is not a proper beam-splitter. Untreated glass reflects off both its front and rear surfaces, producing two offset images of the script. Purpose-made prompter glass is designed to avoid this.

How do I know what size to order?

Measure the pane you removed, including the edges that sit hidden inside the frame, and record the thickness. Measuring only the visible opening produces a pane that will not be retained properly.

Does beam-splitter glass have a correct side?

Often, yes. Many panes are coated on one face and behave differently depending on orientation. Note which side faced the display before you remove the old glass so the replacement goes in the same way.

Will replacement glass affect my image quality?

A good pane costs a little light and very little else. A poor one adds haze, a colour cast, reduced contrast, or ghosting. Always compare a test shot through the new glass against one without the prompter before trusting it on a real shoot.

Test the workflow before buying more gear

Open the ScriptScroller browser teleprompter, put it where your script would actually sit, and find out which of these problems you really have.

Open Teleprompter

Teleprompter Beam-Splitter Glass Replacement: What to Match