Choose a manual zoom lens when magnification is set once per product and adjusted occasionally; choose a motorized zoom lens when the vision system must change magnification automatically between products, recipes or inspection steps. Manual zoom lenses cost less and are mechanically simpler, while motorized zoom lenses enable recipe-driven, hands-free operation on multi-product lines.

Quick Comparison

When a Manual Zoom Lens Is the Right Choice

If your station inspects one product type at one magnification all day, a manual lens is the economical answer. The POMEAS LZL-12100 manual continuous zoom lens covers 0.58X–7.5X (12.5X zoom ratio) with a stable 77.4 ± 2 mm working distance and resolution down to 3.05 μm — one lens spans both overview and detail inspection without changing optics.

For semi-automated workflows where the operator switches between fixed settings, a detented zoom lens such as the LZL-12100D15 gives click-stop positions, so the same magnification is recovered reliably every time — no feedback electronics required.

When a Motorized Zoom Lens Pays Off

Choose motorized zoom when any of these apply:

• The line runs multiple products or recipes and changeover time matters.
• The vision software must log and restore magnification settings automatically for traceability.
• A robot or gantry presents parts at varying heights, requiring focus/magnification adjustment between cycles.
• Remote sites or dark stations must be serviced without an operator at the machine.

The POMEAS LZ-650104 motorized zoom lens covers 0.7X–4.5X with a 82 ± 2 mm working distance, driven by closed-loop DC servo motors over a 9-pin RS-232 interface — zoom and focus positions are commanded and repeated by software. A coaxial-illumination variant (LZ-650105) adds programmed coaxial light for reflective or machined surfaces, and integrated rail versions (LZG-63104-A) simplify mounting on inspection stations.

A Middle Path: Manual Zoom with Position Feedback

If you want manual economics with automated traceability, an electronic-feedback lens is worth considering. The POMEAS LZ-650100DS9 is a manual 6.5X continuous zoom lens whose RS232 interface reports the current magnification position, so the vision system can record, verify and reproduce the optical setting even though a human turns the ring.

Decision Checklist

• How many products/recipes run on this station? More than one → motorized.
• Who changes magnification — an operator or the software? Software → motorized.
• Do you need magnification values in your QC records? Yes → motorized or RS232-feedback.
• Is the station battery-powered or offline? Consider detented manual.

Browse the full range of POMEAS machine vision zoom lenses — manual, detented, motorized and feedback models from 0.5X to 7.5X magnification.

FAQ

Is a motorized zoom lens more accurate than a manual one?

Optical accuracy is similar. The difference is repeatability of the magnification setting: motor positions return to the same place every time, while manual settings depend on the operator unless the lens has detents or position feedback.

Can I upgrade a manual zoom lens to motorized later?

No, the zoom mechanism differs. If automation is likely in the future, choose a motorized model from the start, or a manual model with RS232 magnification feedback as an intermediate step.

What control interface do motorized zoom lenses use?

POMEAS motorized zoom lenses use a 9-pin RS-232 interface for closed-loop DC servo control of zoom and focus, integrable with PLCs and vision software through a serial link or a serial-to-USB/Ethernet converter.

What does "detented" zoom mean?

A detented zoom lens has fixed click-stop positions. Turning the ring lands on predefined magnifications, which improves repeatability without any electronics.

Which zoom ratio do I need?

Zoom ratio = highest magnification divided by lowest. Match it to the ratio between your largest overview field and your smallest detail to inspect; a 6.5:1 lens covers most electronics inspection, 12.5:1 spans very wide ranges.