How to Choose a Lens for a Large Venue Projector

Choosing the correct large venue projector lens is just as important as selecting the right projector brightness. A projector may provide 15,000, 20,000 or even 25,000 lumens, but if the lens cannot create the required image width from the available installation position, the projector is not suitable for the project.

For professional AV installations, lens selection should begin with two measurements:

• Required image width

• Projector lens-to-screen distance

These measurements are used to calculate the required throw ratio.

SMX large venue projector platforms provide interchangeable lens options covering approximately 0.53:1 to 7.51:1, supporting short-distance, standard and long-distance projection installations.

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What Is Projector Throw Ratio?

Throw ratio describes the relationship between projector distance and projected image width.

The basic formula is:

Throw Ratio = Lens-to-Screen Distance ÷ Image Width

For example, if a projector is installed 20 meters from a 10-meter-wide screen:

20 m ÷ 10 m = 2.0:1

The required lens must therefore include approximately 2.0:1 within its supported throw-ratio range.

How to Calculate Projection Distance

If the required throw ratio and screen width are already known, the projection distance can be calculated using:

Projection Distance = Image Width × Throw Ratio

For example, with a 10-meter-wide image and a 1.50:1 lens position:

10 m × 1.50 = 15 m

The projector lens would be positioned approximately 15 meters from the screen.

How to Calculate Image Width

If the projection distance and lens throw ratio are known:

Image Width = Projection Distance ÷ Throw Ratio

For example:

18 m ÷ 1.50 = 12 m image width

These calculations provide an initial optical planning reference. Final installation should also consider zoom position, lens shift, mounting tolerance, screen geometry and manufacturer specifications.

Large Venue Lens Range at a Glance

The wide range of interchangeable lenses allows the projector to be selected according to both brightness and physical installation conditions.

Lens Options for 10,000, 12,000 and 15,000 Lumen Projectors

SMX 10,000, 12,000, and 15,000 lumen large venue projector platforms support multiple interchangeable lenses covering throw ratios from approximately 0.60:1 to 7.02:1.

According to the available lens configurations, OL-MX13ZL is available as a standard manual lens option, while OL-MX41ZLM is available as a standard motorized lens configuration.

OL-MX50SLM — Short Throw Lens

The OL-MX50SLM covers a throw ratio of 0.60–0.75:1 and provides motorized zoom and focus.

It is designed for installations where a large image must be created from a relatively short projector-to-screen distance.

This can be particularly useful in stages, museums, immersive installations and venues where ceiling structure or audience areas limit how far the projector can be positioned from the screen.

OL-MX40ZLM — Short-to-Standard Throw Lens

The OL-MX40ZLM provides a 0.79–1.11:1 throw ratio with 1.4× motorized zoom.

This lens is suitable for installations requiring a wider image from a moderate projection distance and offers greater positioning flexibility than a fixed short-throw optical system.

OL-MX41ZLM — Versatile Standard Motorized Lens

The OL-MX41ZLM covers a wide 1.30–3.02:1 throw range with a 2.3× motorized zoom ratio.

Its broad optical range makes it particularly useful for professional large venue installations where the final projector position may require greater adjustment flexibility.

This lens is listed as the standard motorized lens option for the platform.

OL-MX13ZL — Standard Manual Zoom Lens

The OL-MX13ZL covers 1.46–2.95:1 with a 2.0× manual zoom ratio.

It is suitable for conventional auditoriums, conference halls, and large-screen installations where the projector is positioned at a standard distance from the screen.

This lens is listed as the standard manual lens option.

OL-MX43ZLM — Long Throw Motorized Lens

With a 2.99–5.93:1 throw ratio, the OL-MX43ZLM is designed for longer projection distances.

It can be useful for projector booths, theaters, auditoriums and venues where the projector must be installed far behind the audience or away from the projection surface.

OL-MX15ZL — Extra-Long Throw Lens

The OL-MX15ZL provides a 4.59–7.02:1 throw ratio with 1.52× manual zoom.

It is intended for long-distance professional installations where physical venue constraints require the projector to be positioned far from the screen.

Lens Options for 20,000, 22,000 and 25,000 Lumen Projectors

The higher-brightness SMX large venue projector platform provides six motorized interchangeable lens options covering approximately 0.53–7.51:1.

This range supports everything from relatively short throw installations to very long-distance projection for stadium-style venues, large stages, mapping and major professional AV projects.

All six lenses support a listed screen-size range of approximately 60–500 inches. The MX-EG12ZLM is identified as the standard lens for this projector platform.

MX-EG05ZLM — 0.53–0.65:1 Short Throw Lens

The MX-EG05ZLM provides the shortest throw range in the 20,000–25,000 lumen platform.

A throw ratio of 0.53–0.65:1 allows very large images to be created from comparatively short distances, making it useful where projector placement space is limited.

MX-EG06ZLM — 0.65–0.87:1 Short Throw Zoom Lens

The MX-EG06ZLM extends the short-throw range to 0.65–0.87:1 and provides motorized zoom and focus.

It can provide additional installation flexibility for large stages, event spaces and mapping projects where a short projector distance is required.

MX-EG08ZLM — 0.86–1.25:1 Wide Installation Range

The MX-EG08ZLM covers the transition between short throw and standard projection distances.

Its ±25% horizontal and ±65% vertical lens shift provides additional optical positioning flexibility for complex large venue installations.

MX-EG12ZLM — Standard Large Venue Lens

The MX-EG12ZLM covers 1.24–2.01:1 and is identified as the standard lens for the 20,000, 22,000 and 25,000 lumen platform.

This range is suitable for many conventional large venue installations, including auditoriums, events, exhibitions and professional large-screen AV systems.

MX-EG20ZL — 1.98–3.95:1 Long Throw Lens

The MX-EG20ZL provides nearly a 2× zoom ratio and covers 1.98–3.95:1.

It is suitable for longer projector positions where projectors must be installed behind audience areas, in projection booths or farther from large stage and event screens.

MX-EG39ZLM — 3.95–7.51:1 Extra-Long Throw Lens

The MX-EG39ZLM provides the longest throw capability in this lens family.

Its 3.95–7.51:1 range makes it suitable for very long-distance large venue projection where the projector cannot be installed close to the screen or architectural surface.

Quick Lens Selection by Throw Ratio

*Lens ranges may overlap. The final lens should not be selected only because the required throw ratio falls inside its range. Zoom position, lens shift, projector model, image size and installation tolerance should also be considered.

Example 1 — 10-Meter-Wide Screen at 6 Meters

Assume the required projection image is 10 meters wide and the projector lens can be installed approximately 6 meters away.

6 ÷ 10 = 0.60:1

For the 10,000–15,000 lumen platform, the OL-MX50SLM 0.60–0.75:1 lens would be a logical starting point for evaluation.

For the 20,000–25,000 lumen platform, the MX-EG05ZLM 0.53–0.65:1 may cover the required ratio.

Example 2 — 10-Meter-Wide Screen at 15 Meters

If the lens-to-screen distance is 15 meters:

15 ÷ 10 = 1.50:1

For the 10,000–15,000 lumen platform, both the OL-MX41ZLM and OL-MX13ZL ranges include approximately 1.50:1.

For the 20,000–25,000 lumen platform, the MX-EG12ZLM standard lens covers 1.24–2.01:1 and would be a logical starting option.

Example 3 — 10-Meter-Wide Screen at 35 Meters

For a projector installed 35 meters from a 10-meter-wide screen:

35 ÷ 10 = 3.50:1

For the 10,000–15,000 lumen platform, OL-MX43ZLM covers 2.99–5.93:1.

For the 20,000–25,000 lumen platform, MX-EG20ZL covers 1.98–3.95:1.

Both provide a suitable starting optical range for further engineering evaluation.

Example 4 — 8-Meter-Wide Screen at 40 Meters

For an 8-meter-wide image and 40-meter lens-to-screen distance:

40 ÷ 8 = 5.0:1

For the 10,000–15,000 lumen platform, OL-MX43ZLM and OL-MX15ZL both contain this ratio.

For the 20,000–25,000 lumen platform, MX-EG39ZLM covers the requirement with its 3.95–7.51:1 range.

Short Throw vs Standard Throw vs Long Throw

Why Zoom Range Matters

A zoom lens covers a range of throw ratios rather than one fixed value.

A wider zoom range gives the installer greater flexibility to change projector position or image size without replacing the lens.

For example, the OL-MX41ZLM provides a broad 1.30–3.02:1 range, while the MX-EG20ZL covers 1.98–3.95:1.

This can be valuable when final construction dimensions differ slightly from the original project drawings.

Why Lens Shift Matters in Large Venues

Lens shift allows the projected image to move vertically or horizontally through optical adjustment without moving the projector itself.

On the 20,000–25,000 lumen lens platform, available lens-shift ranges include:

• MX-EG05ZLM: H ±20% / V ±50%

• MX-EG06ZLM: H ±20% / V ±55%

• MX-EG08ZLM: H ±25% / V ±65%

• MX-EG12ZLM: H ±25% / V ±65%

• MX-EG20ZL: H ±25% / V ±65%

• MX-EG39ZLM: H ±25% / V ±65%

Lens shift is particularly useful when the ideal optical centerline cannot be achieved because of ceiling structures, rigging, audience areas or architectural restrictions.

Lens Shift Is Not the Same as Geometry Correction

Lens shift and geometry correction perform different functions.

Lens shift physically moves the image through the projector's optical system, while geometry correction digitally reshapes the image.

Whenever possible, professional installation should prioritize good physical positioning and optical lens shift before applying extensive digital correction.

Choosing a Lens for an Auditorium

Auditoriums often place the projector at the rear of the room or inside a projection booth.

This frequently results in medium or long throw ratios, making standard zoom and long throw lenses especially important.

Before selecting a projector for an auditorium, measure both screen width and the exact lens-to-screen mounting distance.

Choosing a Lens for Stage and Event Projection

Stage and event installations may require projectors to be installed on trusses, platforms or designated technical areas.

Shorter throw lenses can be useful when space behind the audience is limited, while longer throw optics may be required when projectors must remain outside the main stage or viewing area.

Motorized zoom, focus and lens shift can make setup easier in professional event environments.

Choosing a Lens for Projection Mapping

Projection mapping often requires more complex optical planning than projection onto a conventional screen.

The projector may need to cover building walls, stage scenery or irregular surfaces from predetermined mounting locations.

The basic calculation remains:

Throw Ratio = Projector Distance ÷ Required Image Width

However, mapping projects must also consider image overlap, multiple projector coverage, surface geometry, projector orientation and edge blending.

Choosing a Lens for Immersive Projection

Immersive environments often have limited room depth and require very large images on nearby walls.

Shorter throw ratios such as 0.53–0.87:1 or 0.60–1.11:1 may therefore be particularly useful depending on room dimensions and projector platform.

The final choice should be based on the actual wall width, available mounting distance and required image overlap.

Common Lens Selection Mistakes

Several common errors can cause problems during professional projector installation.

• Selecting the projector brightness before checking whether a compatible lens is available

• Using diagonal screen size instead of actual image width for throw-ratio calculations

• Measuring from the projector body instead of approximately from the lens reference position

• Choosing a lens exactly at the end of its zoom range without installation tolerance

• Ignoring lens shift requirements

• Assuming geometry correction can compensate for every physical installation problem

• Ignoring multi-projector overlap in projection mapping or immersive installations

Allow Installation Margin When Selecting a Lens

If the calculated throw ratio is extremely close to the minimum or maximum limit of a lens, installation tolerances should be reviewed carefully.

For example, if the calculated requirement is exactly 3.95:1, selecting a lens whose maximum is also 3.95:1 leaves little adjustment margin.

Where possible, selecting a lens that places the required ratio comfortably within its zoom range can provide greater flexibility during installation and commissioning.

Projector Brightness and Lens Selection Should Be Evaluated Together

A professional large venue projector should not be selected using brightness alone.

The correct decision process is:

Application → Screen Size → Ambient Light → Throw Distance → Throw Ratio → Lens → Brightness → Projector

For example, if the project requires approximately 15,000 lumens but the available mounting position requires a 5.0:1 lens, the final projector selection must support both the required brightness and the required optical range.

Which SMX Large Venue Lens Platform Should You Use?

This broad optical coverage allows SMX large venue projector systems to adapt to both compact installations and very long projection distances.

What Information Should You Send for Lens Selection?

To recommend the appropriate projector and lens, please provide:

• Projector application

• Image or screen width

• Image or screen height

• Lens-to-screen distance

• Projector mounting height

• Horizontal offset from screen center

• Indoor or outdoor installation

• Required projector brightness

• Single or multi-projector system

With these measurements, SMX can calculate the required throw ratio and help identify the appropriate projector and lens combination.

Contact SMX for Projector Lens Selection →

Frequently Asked Questions About Large Venue Projector Lenses

How do I know which projector lens I need?

Divide the lens-to-screen distance by the required image width. The result is the required throw ratio. Select a lens whose supported throw-ratio range includes that value.

What lens do I need for a 10-meter-wide screen from 20 meters away?

20 ÷ 10 = 2.0:1. You therefore need a lens whose throw-ratio range includes approximately 2.0:1.

What is a short throw lens for a large venue projector?

A short throw lens produces a large image from a relatively short distance. On SMX large venue platforms, examples include 0.53–0.65:1, 0.60–0.75:1 and 0.65–0.87:1 lens ranges.

What is a long throw projector lens?

A long throw lens is designed for installations where the projector must be positioned significantly farther from the screen. SMX large venue lens options extend to approximately 7.02:1 and 7.51:1 depending on the projector platform.

Is a larger throw ratio better?

No. Throw ratio is not a performance rating. A larger throw ratio simply means the projector is positioned farther away relative to image width. The correct ratio depends on the installation geometry.

Can two different lenses work for the same throw ratio?

Yes. Some lens ranges overlap. When this happens, the final choice should consider zoom position, installation margin, lens shift, motorized operation and projector configuration.

Should I select the lens before choosing projector brightness?

Brightness and lens availability should be evaluated together. A projector with sufficient lumens is not suitable if its lens family cannot create the required image from the available mounting position.

Can geometry correction replace the correct lens?

No. Geometry correction can help reshape and align an image, but it cannot replace the fundamental optical requirement of producing the correct image size from the available projection distance.

Choose the Projector and Lens as One System

The best large venue projection result comes from treating the projector and lens as one complete optical system.

Start with the screen width and lens-to-screen distance. Calculate the throw ratio, identify compatible lens options, then evaluate brightness, ambient light and installation requirements.

SMX large venue projector systems cover brightness classes from 10,000 to 25,000 lumens with interchangeable lens ranges extending from approximately 0.53:1 to 7.51:1.

This provides system integrators and project customers with greater flexibility for auditoriums, stages, events, museums, immersive installations, projection mapping and other professional large-screen applications.

Send Your Screen Size & Throw Distance to SMX →