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Panasonic H-RSA100400 Leica 100-400mm Micro Four Thirds Lens — main product image
Panasonic H-RSA100400 Leica 100-400mm Micro Four Thirds Lens
Panasonic H-RSA100400 Leica 100-400mm Micro Four Thirds Lens
Panasonic H-RSA100400 Leica 100-400mm Micro Four Thirds Lens
Panasonic H-RSA100400 Leica 100-400mm Micro Four Thirds Lens
Panasonic H-RSA100400 Leica 100-400mm Micro Four Thirds Lens
Panasonic H-RSA100400 Leica 100-400mm Micro Four Thirds Lens
Panasonic

Panasonic H-RSA100400 Leica 100-400mm Micro Four Thirds Lens

★★★★★4.3 (14 reviews)
4K

Panasonic Leica DG 100-400mm delivers 200-800mm equivalent reach in a weather-sealed Micro Four Thirds telephoto zoom.

$1,449.99*$1,699.99Save 14%
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*Price sourced from Amazon.com. Last updated:Jul 16, 2026.Price and availability are subject to change.

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Overview

The Panasonic Lumix Leica DG Vario-Elmar 100-400mm f/4.0-6.3 ASPH Power O.I.S. (model H-RSA100400) is a super-telephoto zoom lens designed for the Micro Four Thirds system, delivering a 200-800mm equivalent focal length range that puts distant subjects within easy reach. Every element in the optical path is engineered to meet Leica Camera AG's stringent quality standards, resulting in images with excellent resolution, contrast, and color accuracy from center to edge. The Power O.I.S. stabilization system compensates for hand shake at long focal lengths, and when paired with compatible Dual I.S. bodies, the stabilization becomes even more effective for handheld shooting.

Built for outdoor and wildlife photographers, this lens features comprehensive weather sealing against dust, moisture, and freezing temperatures down to -10°C, so conditions that would sideline lesser optics won't interrupt your shoot. The 1.3-meter minimum focusing distance combined with 0.5x maximum magnification (35mm equivalent) makes it surprisingly capable for close-up nature work — capturing fine details on butterflies, birds, and other small subjects without disturbing them. The internal autofocus motor operates quietly and smoothly, a critical feature for videographers recording 4K footage where motor noise would be picked up by on-camera microphones. For Micro Four Thirds shooters who need serious telephoto reach without the bulk of a full-frame system, this lens remains one of the most compelling options available.

Key Features

This LEICA DG lens delivers the ultimate in optical quality and performance, meeting the strict quality standards set by Leica Camera AG for brilliant clarity all the way to the edges of your photos

The 100-400m ultra-telephoto zoom (35mm camera equivalent: 200-800mm) captures faraway action like it’s right in front of you, while the compact, lightweight design provides optimal mobility

With a closest focusing distance of 1.3m and maximum magnification of 0.5x*, this lens is a powerful instrument for nature photography, allowing you to zoom in on small, sensitive subjects like birds and butterflies *35mm camera equivalent.

Designed to keep shooting in the toughest conditions, thanks to its dust-, splash-, and freeze-resistant construction; shoot in temperatures as low as -10 °C

Fast, accurate autofocus and smooth aperture changes, critical for the modern content creator, allowing you to record beautiful 4K video and stills without disturbing your subject

Driven by world-renowned Japanese technology and a spirit of never-ending innovation, LUMIX cameras inspire creators to tell their stories beautifully and vividly.

Specifications

Focal Length
100-400mm (200-800mm equivalent)
Maximum Aperture
f/4.0-6.3
Lens Mount
Micro Four Thirds
Optical Design
Leica DG Vario-Elmar
Image Stabilization
Power O.I.S.
Minimum Focusing Distance
1.3m (4.3 ft)
Maximum Magnification
0.5x (35mm equivalent)
Weather Sealing
Dust, Splash, and Freeze Resistant (to -10°C)
Model
H-RSA100400

Frequently Asked Questions

On Micro Four Thirds cameras with their 2x crop factor, the 100-400mm focal length provides a 200-800mm equivalent range, making it one of the longest-reaching zoom lenses available for the system.
The minimum focusing distance is 1.3 meters (about 4.3 feet), and it achieves a maximum magnification of 0.5x (35mm equivalent), which is useful for capturing detail on small subjects like insects and flowers at the telephoto end.
Yes, it features dust-resistant, splash-resistant, and freeze-resistant construction, rated for operation in temperatures as low as -10°C (14°F). Pair it with a weather-sealed camera body for full protection.
Yes, it includes Panasonic's Power O.I.S. (Optical Image Stabilizer), which helps counteract camera shake at long focal lengths. It can also work in conjunction with compatible Lumix bodies that offer Dual I.S. for enhanced stabilization.
Yes, the lens uses an internal focus motor designed for smooth, quiet operation during both autofocus and aperture changes, making it suitable for 4K video recording without audible motor noise.

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