(KL Series) SCHOTT 157.420 “Standard” Annular Ringlight — 66mm

The SCHOTT 157.420 is a “Standard” annular ringlight designed to deliver a continuous, 360° ring of illumination around the objective for shadow-minimized lighting during microscopy and precision inspection. It mounts directly to the objective via a thumb screw and is designed for 66 mm standard objectives.

Compatibility: KL Series (listed for KL 1600 / KL 2500; also referenced for KL 1500 on the product page).
Quantity: 1 Ringlight

Specifications:

Manufacturer: SCHOTT
Part number / SKU: 157.420
Availability: 2–3 Weeks
Weight: 2.00 lbs
Ringlight inner Ø: 66 mm (2.60")
Ringlight outer Ø: 96 mm (3.78")
Height: 26 mm (1.02")
Minimum working distance: 25 mm (0.98")
Length: 1000 mm (39.37")
Light source adapter Ø: 10 mm (0.39")

SCHOTT 157.420 Features

Continuous ring of illumination fiber within the housing
Designed to fit 66 mm standard objectives
Mounts directly to the objective via thumb screw
Rugged black anodized aluminum housing
Fiber bundle protected with flexible metal/PVC sheathing

Why teams use an annular ringlight

Shadow-minimized illumination: annular lighting reduces harsh directional shadows and supports consistent contrast
Uncluttered work zone: ringlight format minimizes interference compared with dual-gooseneck aiming in tight setups
Repeatable inspection: fixed ring geometry helps reduce operator-to-operator lighting variation

Common System Pairing

This ringlight is listed for the SCHOTT KL Series. A common pairing in your catalog is:

SCHOTT KL 1600 LED Fiber Optic Light Source (100–240V)

About the Manufacturer:

SCHOTT is a multinational technology group known for specialty glass, advanced materials, and precision components used across optical, industrial inspection, and life-science workflows. Within microscopy illumination, SCHOTT’s KL ecosystem is built around modular, field-proven accessories that help teams standardize lighting geometry and improve repeatability in inspection and imaging setups. :contentReference[oaicite:1]{index=1}

Related Ringlights & Light Guides

Notes: Want help selecting ringlight diameter (40mm vs 58mm vs 66mm), working distance, or a complete KL station? Open the SOSCleanroom Technical Vault tab above.

For application support, call 800-443-7101 or email Sales@SOSsupply.com.

Product page updated: Feb. 5, 2026 (SOS Technical Staff)

© 2026 SOSCleanroom.com. All rights reserved.

The Technical Vault: SCHOTT 157.420 “Standard” Annular Ringlight (66mm)

Vault purpose: How annular illumination changes defect visibility, how to size the ringlight to your objective, and what to document so results stay repeatable.

1) What “annular” illumination actually does

Annular (ring) illumination delivers light from a continuous 360° ring around the viewing axis. Compared with directional goosenecks, the ring format can reduce strong, one-sided shadows and can improve uniformity on flat or gently contoured surfaces.

This is especially useful when your inspection criteria are sensitive to lighting changes (micro-scratches, haze, edge chips, and cosmetic surface defects).

2) Objective diameter: why 66mm matters

The 157.420 is intended for 66 mm standard objectives and mounts to the objective using a thumb screw. If the ringlight inner diameter doesn’t match your objective geometry, you may see mechanical interference, tilt, or inconsistent concentricity.

Selection shortcut: match the ringlight size to your objective/front-end diameter first, then validate working distance vs your part height/fixture stack-up.

3) Working distance and fixture clearance

The product listing calls out a minimum working distance of 25 mm. In practice, you should account for part height, fixture lips, and any guarding so the ringlight doesn’t collide during focus travel or operator handling.

Document: objective-to-part distance at focus
Document: fixture stack height and any protective rings/guards
Verify: clearance during full focus range

4) What to lock down for repeatability

Illumination intensity/setpoint: record the knob/setting (or controller value) on the light source
Ring position: mark the ring’s axial placement on the objective so it resets consistently after cleaning
Acceptance references: store a “golden sample” image for glare/contrast baseline

5) KL system context (what it pairs with)

The 157.420 is listed as compatible with the SCHOTT KL Series (and is specifically tagged for KL 1600 / KL 2500 on the page). :contentReference[oaicite:2]{index=2}

SCHOTT KL 1600 LED Fiber Optic Light Source
SCHOTT 154.202 Double Rigid Gooseneck Light Guide (alternative to ring illumination when directional lighting is desired)

6) Source basis (spec traceability)

SOSCleanroom listing: SCHOTT 157.420 product page (SKU, availability, weight, compatibility, features, and dimensional specifications). :contentReference[oaicite:3]{index=3}
Related items (cross-links verified): 157.410, 157.040, A08600, 154.101, 154.202. :contentReference[oaicite:4]{index=4}