Lime One

Lime Two is a compact Light meter for analog cameras.

The Lime Two is the evolution of the Lime One, which was funded through a succesful Kickstarter Campaign in late 2020:

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
  • full, half or third stop readout and input for aperture and shutter speeds

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.


The Lime Two was designed with adaptability in mind:

The meter now has multiple mounting positions available, allowing the foot mount to be aligned left, right and center.

Mounting options Center mount

Besides the meter there now are different adapters available:

A dual slot adapter in combination with a rear button extension accessory Double adapter
A 2mm shim to extend the height of the meter to clear more bulky rewind knobs A
A low profile adapter for the Hasselblad 500 series Hasselblad 500
An adapter for the bay-1 bayonet mount, compatible with f3.5 TLRs from Rolleiflex, Yashica etc. Bay 1


size 43,5x30x15,5 mm
weight 23 g
battery 3V CR2032
aperture f0.7 ... f1024
shutter speed 1/8000s ... 8 hours 20 minutes
ISO 0.5 ... 12800
stepsize 1/3, 1/2 and full stops
dynamic range -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

My name is Johannes Heberlein, I am a mechatronics engineer from Nuremberg 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, distribution and some engineering I partner with local companies as well as international partners.
Johannes Heberlein


Josephspl. 8
90403 Nürnberg
Represented by: Johannes Heberlein

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