The BenQ LK936ST can move the projected image optically, but a mount still has to satisfy distance, horizontal position and height together. Its published lens-shift limits are ±23% horizontally and ±60% vertically. Those numbers describe adjustment relative to the projected image, not a universal number of inches available in every installation.
This worksheet helps you decide what to measure and test for the BenQ LK936ST. It is a planning guide based on BenQ documentation and calculated examples. It does not certify a particular ceiling location or report hands-on projector testing.
Keep these three adjustments separate
| Adjustment | Its job | What you still need to check |
|---|---|---|
| Optical zoom | Changes image size at a given distance | Whether the desired size lies inside the lens range. |
| Optical lens shift | Moves the projected image while the projector remains aimed squarely | Whether the requested horizontal and vertical shifts work together. |
| Keystone or Corner Fit | Reshapes the image digitally | Whether the resulting geometry and detail remain acceptable. |
Start by making the projector square to the screen, then evaluate optical positioning. If you aim the body sideways to make the picture land on the screen, you have introduced an angle that lens shift alone does not remove. Record that angle problem separately from a simple sideways displacement.
Choose the correct image dimensions for the calculation
BenQ’s manual defines lens shift using the projected image’s width and height. For a native 16:9 setup, those dimensions are straightforward. For a 4:3 or square active picture inside the native image, document the full optical image separately from the visible golf picture.
Otherwise, two installers can use the same percentage and produce different answers: one is measuring the full projection and the other is measuring only the active area on the impact screen. The black enclosure border and the outside frame are neither of those dimensions.
Convert the specifications into inches
The following examples assume a native 16:9 optical image. Each maximum is an individual-axis reference from the published specification, not a promise that both maxima are available together.
| Optical width | Optical height | 23% of width | 60% of height |
|---|---|---|---|
| 10 ft | 5.625 ft | 27.60 in | 40.50 in |
| 12 ft | 6.750 ft | 33.12 in | 48.60 in |
| 14 ft | 7.875 ft | 38.64 in | 56.70 in |
For example, a 12-foot-wide native image is 6.75 feet, or 81 inches, tall. Its individual reference amounts are 144 × 0.23 = 33.12 inches horizontally and 81 × 0.60 = 48.60 inches vertically.
The manual’s effective-position diagram has clipped corners. Do not turn those two reference amounts into a rectangular area of guaranteed mounting positions. A location needing substantial movement in both directions must be checked against the combined limit and tested with the actual projector.
A worked offset request
Suppose your 12-foot-wide native image needs its center shifted 18 inches sideways and 12 inches vertically from the centered optical position. The requested movements are:
- Horizontal: 18 ÷ 144 × 100 = 12.5% of image width.
- Vertical: 12 ÷ 81 × 100 = 14.8% of image height.
These percentages make the request specific enough to review. They do not complete the installation check. Next, confirm the combined setting, projection distance, image coverage, body clearance and mounting hardware. If the geometry only works at an adjustment limit, identify an alternative position before installing.
Confirm throw distance independently
The LK936ST’s specified throw ratio is 0.81–0.89 with 1.1× optical zoom. A 12-foot-wide native image therefore gives a starting lens-to-screen range of 9.72–10.68 feet. Lens shift does not make a position outside that optical distance range suitable for the same image size.
For a narrower active aspect ratio that uses the full image height, calculate the full 16:9 optical width first. Our LK830ST vs LK936ST placement guide explains the distance implications. Keep that decision separate from the sideways and vertical adjustment worksheet here.
Use this mounting worksheet
| Record | Why it matters |
|---|---|
| Visible screen width and height | Defines the intended active picture. |
| Full optical image width and height | Provides the dimensions used for shift percentages. |
| Lens-to-screen distance | Checks optical size before shift is considered. |
| Required horizontal and vertical movement | Makes the combined-position request explicit. |
| Lens position relative to the mount plate | Prevents using a ceiling bolt as the lens reference. |
| Beam, pipe and enclosure positions | Identifies obstructions to the body and projected light. |
| Hitting position and every user’s swing path | Checks whether an optically valid mount is usable for golf. |
| Final image and setting photographs | Creates a record for installation and future changes. |
Use one consistent reference plane: the impact screen surface. Then mark the image center and the proposed lens position. A ceiling plan can show where the mount attaches, but a side view is also needed to show lens height, the body and any beam between projector and screen.
Test the whole position before fixing the mount
With the projector securely supported, establish image size, then adjust optical shift. Check all four edges and small text across the screen. Make one adjustment at a time and note whether the other axis still reaches its intended position.
BenQ warns against forcing the shift control beyond its adjustment limit. A clicking control is a reason to stop and follow the manual, not evidence that another turn will produce the missing movement. Keep enough access to reach the controls after the projector is mounted.
When a different mounting plan makes more sense
Reconsider the location when it requires incompatible combined shifts, sits outside the throw range, obstructs a swing or leaves too little room for the projector and its required ventilation. A better ceiling point can be more valuable than a larger digital correction.
If you are choosing between optical shift and automatic setup assistance, use our AK700ST vs LK936ST comparison. To check this model’s hardware and access its manual, see the LK936ST product page.
