AstrHori AH-M1 Light meter

Precise Exposure Control for Analogue and Manual Photography

The AstrHori AH-M1 is a compact light meter designed for photographers using analogue cameras, manual lenses, or those seeking precise exposure control beyond automatic camera settings. Constructed from durable aluminium, it features an adjustable cold shoe mount and offers accurate light measurement within an EV range of 1 to 22 (at ISO 100).

Key Features

• Lightweight aluminium housing with adjustable cold shoe (Allen key included)
• Measurement angle approximately 30°, matching a standard 50 mm lens perspective
• Two operating modes: aperture priority (A) and shutter priority (T)
• Measurement range EV1–EV22 (ISO 100), suitable for very low light to bright scenes
• Shutter speeds from 32 seconds to 1/8000 seconds
• Aperture range from f/1 to f/32 for precise depth of field control
• ISO sensitivity adjustable from 5 to 6400
• Exposure compensation ±3 EV for brightness adjustments
• Clear 0.66-inch OLED screen with backlight for visibility in strong daylight
• Simple operation via a single dial and button
• Fast measurement time of 0.5 seconds or less
• 120 mAh rechargeable battery providing up to 12 hours of continuous use
• USB-C fast charging (approx. 40 minutes)
• Automatic sleep mode after 25 seconds inactivity and shutdown after 3 hours
• Can be used handheld or mounted on a camera

Design and Usability

The AH-M1’s ergonomic design includes a large dial and a clear OLED display, enabling quick and intuitive adjustments even when wearing gloves. Its compact size (38 x 26 x 14 mm) and light weight (48 g) make it unobtrusive when mounted or carried. The adjustable cold shoe mount ensures compatibility with various camera models without obstructing controls or viewfinder.

Versatile Performance

With its wide ISO range and shutter speed options, the AH-M1 is suitable for diverse shooting conditions—from night photography to bright daylight. The device’s exposure compensation feature allows photographers to adapt to challenging lighting scenarios such as high contrast, snow, or strong point light sources. Its fast and accurate readings support dynamic environments like street photography, concerts, and video production.

Ideal for Video and Film Work

The AH-M1 is also favored by filmmakers for its exposure repeatability and manual control. Aperture and shutter priority modes facilitate quick adjustments to changing light, while exposure compensation helps craft the desired mood and lighting style. This precision reduces exposure fluctuations, simplifying post-production color correction.

Technical Specifications

• Model: AstrHori AH-M1
• Material: Aluminium
• Screen: 0.66-inch OLED
• Measurement angle: approx. 30°
• Measurement range: EV1–EV22 (ISO 100)
• Aperture range: f/1–f/32
• Exposure time range: 32 s – 1/8000 s
• ISO range: 5–6400
• Exposure compensation: ±3 EV
• Operating modes: Aperture priority (A), Shutter priority (T)
• Power supply: 120 mAh rechargeable battery
• Operating time: up to 12 hours continuous measurement
• Single measurement time: ≤ 0.5 seconds
• Charging: USB-C port, approx. 40 minutes
• Dimensions: 38 x 26 x 14 mm
• Weight: 48 g

Included in the Package

• AstrHori AH-M1 light meter
• USB-A to USB-C charging cable
• Allen key for cold shoe adjustment