Projection guide

Calculate distance and choose a lens

Ask GLMedia about event projection: we review distance, lens, and placement, along with configuration, availability, and alternatives.

Planning criteria

With the date, location, and intended use, we can review which equipment and combination can be offered. You can inquire before measurements, drawings, or the final schedule are ready.

As an estimate, projection distance ≈ active image width × throw ratio. Use matching units and the ratio for the exact model, lens, and format.

This guides research; focus, offset, lens shift, mounting, and measurement reference still need checking. Start with approximate dimensions and identify what to confirm.

System decisions

Active width: Measure the actual image area, not frame or diagonal. Confirm working aspect ratio and resolution.
Exact lens: Identify code and projector compatibility. A family name or physically similar lens is insufficient.
Actual position: Check the estimate against the official table or calculator. Review height and reference point; for UST, do not use a generic chassis distance.

What to share

Share image width and height, available distance, and screen and projector positions.

For existing equipment, send model, lens, and identification photo. We can identify missing details without guessing a variant.

Preparing the comparison

Calculate an initial range only with the applicable ratio. Conditional example: 4 m width with Barco R9802300 at 0.65–0.75:1 gives approximately 2.6–3 m.
This example requires compatibility, format, focus range, and official measurement reference checks. It is not an approved mounting dimension.
Use the correct model and resolution distance table; do not mix tables for variants with different aspect ratios.
Test center and edge focus, geometry, and readability at the planned position before fixing the installation.

Technical questions and show decisions

Can I multiply diagonal by throw ratio?
Does zoom allow any distance in the room?
Does this calculation specify screws, mount, and safety?
What can we quote if the projector will not work in the planned position?

Can I multiply diagonal by throw ratio?

The ratio uses image width. With diagonal alone, establish aspect ratio first to obtain width and height; do not substitute frame dimensions for active area.

Does zoom allow any distance in the room?

Optical zoom has a limited range and some lenses are fixed. Check focus, offset, and shift too; throw range does not guarantee every installation height.

Does this calculation specify screws, mount, and safety?

The estimate only guides the optical path. Mount, attachment, loads, ventilation, and safety distances require exact-system documentation and site conditions.

What can we quote if the projector will not work in the planned position?

Compare another position, another documented projector/lens combination, or a different image size while reviewing readability and audience circulation. A sketch, approximate image width, and available areas are enough to start; for venue equipment, obtain its model and lens code before proposing a change.

The comparison covers distance, focus, allowed optical shift, installation space, and the signal path. The proposal can cover equipment alone or add installation, setup, and operation. Selection depends on documented compatibility and a test in the intended position; a shorter lens or digital correction alone cannot resolve every limitation.

Checks to guide decisions

Projection guide
Symptom	Check	What it helps distinguish
Calculation differs	Active width, format, and reference point.	Starting data.
Image fits but is out of focus	Focus range and optical position.	Lens and placement.
Height or displacement missing	Supported offset and lens shift.	Available geometry.

Installation and limits

Do not use digital correction to replace an incompatible lens or operation outside its range.

Keep measurements and documents. A different variant or lens requires reviewing the affected calculation.

Sources and context

Official model-specific documentation. Check variant, accessories, and conditions before applying settings or calculations.

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