Pentax Digital Spotmeter

Pentax Digital Spotmeter
Precision 1° Reflected Light Meter for Ultimate Exposure Control
The Pentax Digital Spotmeter is a legendary, professional-grade handheld exposure meter designed to give film and digital photographers absolute control over their highlights and shadows. Highly favored by landscape photographers, cinematographers, and masters of Ansel Adams’ Zone System, this lightweight yet incredibly durable device delivers highly accurate reflected light readings from a razor-thin 1° measuring angle.

By allowing you to isolate and read a single, specific texture from a distance without moving your camera or approaching the subject, the Pentax Digital Spotmeter removes all guesswork from complex or high-contrast lighting environments.

Optical Viewfinder Architecture & Bright LED Telemetry
Ultra-Narrow 1° Measurement Spotlight: Isolates a pinpoint 1° sampling zone right in the center of the frame, allowing you to accurately meter distant highlights, deep shadow crevices, or mid-tone values with surgical precision.

Silvered Pentaprism & Bright Fresnel Screen: Outfitted with a premium, silvered glass pentaprism that displays a laterally correct, upright image while metering. The 1° spot target is centered on a high-transmission Fresnel lens to ensure bright, uniformly even viewfinder illumination.

Super Multi-Coated Optics: Both the objective front element and the eyepiece lenses feature Pentax’s iconic Super Multi-Coating (SMC) to dramatically minimize ghosting and flare while maximizing viewfinder brightness.

Large Internal LED Digital Display: Displays exposure values inside the viewfinder via a large, luminous digital LED overlay. The red digits are instantly readable in blinding desert sun or pitch-black nighttime long-exposure environments.

Adjustable Diopter Control: The rugged rubber eyepiece assembly features built-in diopter correction adjustable from -2 to +1 diopters, ensuring glasses-free, tack-sharp viewing of the target grid.

90mm Lens Perspective Equivalent: Offers a diagonal 26° field of view through the finder, mimicking the exact perspective of a short-telephoto 90mm lens mounted on a traditional 35mm film camera.

Shock-Resistant Chassis & Flexible Scale Calculators
Rugged, Impact-Resistant Construction: The chassis is engineered to resist mechanical shock, heavy vibration, and grueling field use, making it an incredibly reliable analog tool for backcountry expeditions.

Manual Calculator Barrel Scales: Features a series of highly detailed, smoothly rotating calculation rings wrapped around the objective barrel. The rings allow you to instantly translate your recorded digital numbers into precise exposure pairings, offering metrics in fine 1/3-stop increments:

ISO / ASA Range: 6 to 6400

Aperture Range: f/1 to f/128

Shutter Speed Spectrum: 1/4000 Second to 4 Minutes

EV Value Correlation: EV 1 to 20

Integrated 40.5mm Front Filter Thread: Built with a standard 40.5mm threaded filter ring on the front objective housing. This allows black-and-white film photographers to thread on red, yellow, or green contrast filters directly over the meter lens to precisely evaluate color reflectivity and shadow compression exactly as the film emulsion will capture it.

High-Sensitivity Photo Diode & Versatile Power
Silicone Photo Diode Sensor: Utilizes a highly sensitive and stable Silicone Photo Diode (SPD) cell that responds instantly to shifting light levels without memory lag or drifting values under temperature extremes.

Wide EV 1 to 20 Sensivity Baseline: Reliably registers exposures from very dim low-light landscapes up to extremely bright, reflective snowfields.

Flexible 6V Battery Infrastructure: Powered by a single, readily available 6V small-cell battery. The compartment accepts 544 Silver Oxide cells, 537 Alkaline cells, or standard battery equivalents like the SPX28, 4LR44, or 4SR44.

Long-Distance Focusing Baseline: Accurately calculates exposure distances from a standard 5 feet (1.5 meters) out to infinity, with close-range macro metering down to 3.3 feet (1 meter) fully supported.

Technical Specifications
Meter System Classification: Professional 1° Reflected Light Digital Spotmeter

Internal Light Sensor Cell: High-Sensitivity Silicone Photo Diode (SPD)

Measurement Target Angle: 1° Spot Center Circle

Operational Sensitivity Range: EV 1 to EV 20 (in 1/3-stop increments)

Viewfinder Frame Coverage: Real-Image Pentaprism Layout (26° Diagonal Field of View)

Eyepiece Diopter Scope adjustment: -2 to +1 Diopters

Front Accessory Lens Interface: 40.5mm Threaded Filter Ring

Calculated Film Speed Stops: ISO / ASA 6 to 6400

Calculated Aperture Range: f/1.0 to f/128 (1/3-stop increments)

Calculated Shutter Timers: 1/4000 Sec to 4.0 Minutes (1/3-stop increments)

Primary Power Cell Requirements: 1x 6V Battery (544 Silver Oxide, 537 Alkaline, 4LR44, or 4SR44)

Standard Operational Distance: 5.0 feet / 1.5 meters to Infinity (Down to 1.0 meter close-range)

Chassis Environmental Protection: Heavy-Duty Shock-Resistant Composition

Compatible Accessory Grid: Protective Cases, Tripods, Wrist Straps, 40.5mm Filters, Lens Caps