4K Zoom Lens: 4 Models, Real Resolution Data and How to Choose

A 4K zoom lens is not defined by a label on the datasheet. It only delivers 4K-level images when the lens resolves the pixel pitch of the camera behind it, holds distortion low enough across the zoom range, and covers the sensor's image circle. POMEAS publishes the optical data for each magnification step, so the question can be answered with numbers instead of adjectives.

This page lists every 4K-class continuous zoom model in the current catalogue with the figures published on its product page: zoom ratio, optical magnification, working distance, maximum sensor, mount and per-step resolution.

Models at a glance

Models below share the same 0.68X–5.0X optical platform but differ in control method, sensor coverage and mechanical form. That is why the same "4K zoom lens" query returns several part numbers.

All values below are transcribed from the published product pages. Blank cells mean the value is not published for that model — treat as 待确认, not as zero.

Optical data at each magnification

Resolution here is the optical resolution at the image plane, not the sensor pixel size. At 0.68X it is roughly 10 µm; by 3X it is close to 3 µm. If your defect is 20 µm and you work at 0.68X, the lens — not the camera — is the limit.

PMS-K75M

PMS-LZH-7504

Which of these models fits which job

Large-board inspection at low magnification. 0.68X on a 1-inch sensor covers a wide field with distortion below 0.02%. Choose the manual version when the magnification is set once per product change.

Mixed-product lines. Motorized control (RS-232 or pulse) is the differentiator: the magnification can be changed from the PLC without touching the lens, and the position can be stored per recipe.

Coaxial illumination. Some 4K models are published as coaxial-configuration lenses, others as external-illumination only. Confirm the illumination configuration before quoting — the mechanical interface differs.

4K zoom vs 4K fixed focal vs line scan

The three platforms answer different questions, and picking the wrong one is more expensive than picking the wrong model inside a platform.

A zoom lens trades a little resolution for flexibility. If the product mix never changes, a fixed focal lens at the same magnification will usually resolve slightly better and cost less. If the mix changes weekly, the zoom lens removes a mechanical changeover.

What to confirm before you quote a 4K zoom lens

• Sensor diagonal and pixel pitch — the "4K" claim depends on both.
• Whether the required resolution is optical or interpolated.
• Working distance: the 4K platform is published around 80 mm; longer WD needs a different platform, not a spacer ring.
• Illumination configuration, especially for reflective or transparent parts.
• Whether the magnification is fixed per recipe or changed during the cycle.

FAQ

Is a 4K zoom lens the same as a 4K camera lens?

No. A 4K camera lens is usually a fixed-focal lens for photography. A 4K zoom lens here means a continuous zoom lens whose optical resolution stays compatible with 4K sensors across the zoom range.

Can I use a 4K zoom lens on a 2K camera?

Yes. The lens resolves more than the camera needs; the benefit is a sharper image and less aliasing, not a higher pixel count.

Does the 4K label guarantee 4K resolution at every magnification?

No. Check the per-magnification resolution table. Resolution degrades or improves with magnification, and the published step data is the only reliable reference.

Why do two 4K models have the same zoom range but different prices?

Control method, sensor coverage, illumination configuration and mechanical length differ. The optical platform can be identical while the integration cost is not.

Next step

If you already know the field of view and the defect size, the magnification follows from them. Start with the numbers, then pick the model.

• Motorized zoom lens complete guide
• 6.5X vs 12.5X zoom lens: selection guide
• Magnification and FOV calculator (2X–50X)