Lime One

Lime One is a compact Light meter for analog cameras.

a compact light meter

A reflective light meter for manually controllable cameras that don't have a meter integrated or have one that is no longer working.

usabiltity first

  • aperture priority, shutter priority, manual, exposure value modes
  • fast operation and start up, stored previous settings
  • set parameter quickly using a control wheel
  • change secondary parameters by holding the button when turning the wheel

engineered for longevity

  • anodized aluminium body and control wheel
  • uses the standard accessory shoe mount
  • standard CR2032 battery used in many devices

how to

The how to clip below explains the workflow in aperture priority mode.

The tabs A S M EV show how different modes are effecting the display and calculation. The camera pans from a darker (left) to a brighter (right) area.

aperture priority: f-number is set and the shutter speed is calculated
shutter priority: shutter speed is set and the aperture f-number is calculated
manual mode: f-number and shutter speed is set and the exposure offset is calculated
exposure value: shows the exposure value, compensated for ISO and EV offset.


size 43x30,5x15 mm
weight 16 g
battery 3V CR2032
aperture f0.7 ... f1024
shutter speed 1/8000s ... 8 hours 20 minutes
ISO 0.5 ... 12800
stepsize 1/3 stop (optionally 1 stop)
dynamic range
(@ISO 100)
-3* ... 20 EV
*: Below 0 EV usable, but having a lower resolution, more noisy signal

Field of view:
(approx. 50mm lens, center weighted)

operational modes:

parameter A S M EV
primary (wheel) f-number shutter speed shutter speed exposure comp.
secondary (wheel+button) exposure comp. exposure comp. f-number ISO
calculated result shutter speed f-number exposure comp. exposure value

See the download section for PDF downloads

exploded view:



My name is Johannes Heberlein, I am a mechatronics engineer and created the Heberlein Design Company - HEDECO to bring my personal projects to life. After years of tinkering and publishing open source projects (e.g. plotclock / thingiverse) I decided to develop some of my projects for the consumer market in the style of a small batch business . While working primarily on my own, for manufacturing and some engineering I partner with local businesses around the Nuremberg metropolitan area. Johannes Heberlein

Order information

Updated: Sept. 10 2021

The online shop is now open!

Black units will be back in stock in November. If you want to get notifed about new stock you can subscribe to the newsletter for availability.


Josephspl. 8
90403 Nürnberg
Represented by: Johannes Heberlein

Register entry
Entry in: Handelsregister
Register Number: HRB 37837
Register Court: Nürnberg

UST-IdNr.: DE332934803

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PDF downloads

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