openFrame Microscope

A high‑quality, cost‑effective, and fully modular microscope platform built to evolve with your research. Engineered for seamless upgrades, it adapts instantly to new experimental procedures through its open, reconfigurable architecture.

Compatible with a wide range of optics, cameras, and stages from any major manufacturer, it protects your Microscopy investment while giving you limitless freedom to innovate.

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The openFrame is a compact, modular, open-source microscope conceived by Paul French and developed with colleagues from the Photonics Group at Imperial College London, and designed, supported, and extended in collaboration with Cairn Research. The fundamental building blocks for self-builders are open source and can be purchased directly from Cairn, or machined in your own workshop based on the STEP files provided on, Photonics Group.

Alternatively Cairn Research can design, build, and test a bespoke microscope for your specific application consisting of any pre-assembled and aligned openFrame layers, complete with a choice of light sources, images splitters, stages, cameras, software etc from Cairn or other manufacturers. We are committed to sustainability and will also seek to integrate any components that you may already have in the lab on redundant microscopes to save your hard-earned grant money and to avoid waste.

Application Usage

  • Wide-field fluorescence
  • Phase contrast
  • Fluorescence Lifetime Imaging (FLIM)
  • Simultaneous/ratiometric calcium and voltage imaging
  • High content imaging
  • Single molecule and super resolution STORM/PALM/SIM
  • Total Internal Reflection Fluorescence (TIRF)
  • Fluorescence Recovery After Photobleaching (FRAP) and optogenetics
  • Electrophysiology
  • Bioluminescence
  • Single Plane Illumination Microscopy (SPIM)
  • Containment labs (compact and easy to sterilise)
  • Polarisation studies (anisotropy)

Features and Benefits

  • Compact and stable
  • Can be reconfigured rapidly and easily for different applications
  • Supplied with infinity-corrected tube lens and objectives from multiple sources, including Olympus and Nikon
  • Simultaneous imaging with multiple cameras and large format sensors (>25mm diagonal)
  • Extensible, only buy (or build) what you need, as you need it
  • Sustainable, can be supported and maintained by any competent microscopist or technician
  • Direct interface with parts from other manufacturers (e.g. Thorlabs) for rapid development of new techniques
  • Brand agnostic, works with existing illuminators, cameras, stages, objectives, filters, and lenses from any manufacturer
  • Unrivalled access to optical train, laser pointer test kit available for alignment and validation
  • Easy to clean or autoclave
  • Transportable – suitable for tradeshows, teaching courses and secondments
  • No eye pieces – COVID-19 / multi-user friendly
  • Comprehensive turn-key bespoke microscopes, built to order on an open-source platform
  • Rapid development environment for exploitation of new techniques and technologies
  • Compact and affordable base for specialised and routine experimental needs
  • Scalable for high content acquisition, diagnostics or teaching
  • Stacked, modular design provides inherent stability and facilitates easy access to primary optical path

Research Examples

NPM1 Undergoes Salt-Dependent Reentrant Phase Separation Driven by IDR Conformational Plasticity and Electrostatic Crosstalk – April 2026

Quantitative evaluation of LED based optical autofocus module – April 2026

Biomolecular condensates sustain pH gradients at equilibrium through charge neutralization – January 2026

Assessing PARP trapping dynamics in ovarian cancer using a CRISPR-engineered FRET biosensor – January 2026

piSTORM: programmable illumination in stochastic optical reconstruction microscopy – November 2025 

SlimVar for rapid in vivo single-molecule tracking of chromatin regulators in plants – September 2025

A roadmap for the widespread adoption of frugal microscopes – September 2025

Diffusing protein binders to intrinsically disordered proteins – July 2025

Quantitative Nanometrology of Binary Particle Systems Using Fluorescence Recovery after Photobleaching: Application to Colloidal Silica – May 2025

Model‐free machine learning‐based 3D single molecule localisation microscopy – May 2025

VP-CLEM-Kit: An accessible pipeline for visual proteomics using super resolution volume correlative light and electron microscopy (SR-vCLEM) – April 2025

Open-source implementation of polarisation-resolved single-shot differential phase contrast microscopy (pDPC) on a modular openFrame-based microscope – March 2025

Fluoro-Electrochemistry Based Phytoplankton Bloom Detection and Enumeration; Field Validation of a New Sensor for Ocean Monitoring – October 2024

A prenatal skin atlas reveals immune regulation of human skin morphogenesis – October 2024

Super-resolved fluorescence imaging utilising accessible stochastic optical reconstruction microscopy (easySTORM) implemented on a low-cost, modular open-source (openFrame) microscope – September 2024

Mechanical Profiling of Biopolymer Condensates through Acoustic Trapping – September 2024

Development of a large volume line scanning, high spectral range and resolution 3D hyperspectral photoluminescence imaging microscope for diamond and other high refractive index materials – September 2024

Development of a large volume line scanning, high spectral range and resolution 3D hyperspectral photoluminescence imaging microscope for diamond and other high refractive index materials – April 2024

Innovating in a bioimaging core through instrument development – April 2024

Cost-effective, Modular, Research-grade Optical Microscope – January 2024

Controlling crystallisation and dissolution of biogenic CaCO3 via dissolved magnesium cations – January 2024

The Chromatin Regulator HMGA1a Undergoes Phase Separation in the Nucleus – November 2023

openFrame: A modular, sustainable, open microscopy platform with single‐shot, dual‐axis optical autofocus module providing high precision and long range of operation – August 2023

High-Throughput Combinatorial Analysis of the Spatiotemporal Dynamics of Nanoscale Lithium Metal Plating – August 2023

Surface patches induce nonspecific binding and phase separation of antibodies – April 2023

The K2: Open-source simultaneous triple-color TIRF microscope for live-cell and single-molecule imaging – March 2023

A simple microscopy approach quantifies biomineralized CO2 in Coccolithus braarudii – a calcifying marine phytoplankton – March 2023

Surface patches induce nonspecific binding and phase separation of antibodies – February 2023

Open microscopy in the life sciences: quo vadis?  – August 2022

The miEye: Bench-top super-resolution microscope with cost-effective equipment – July 2022

Rapid Opto-electrochemical Differentiation of Marine Phytoplankton – April 2022

Surface interaction patches link non-specific binding and phase separation of antibodies – March 2022

Development and Applications in Super Resolution Microscopy – July 2021

Low-cost, sustainable, modular open microscopy and high content analysis – June 2021

FAQ

Cairns’s design ethos is based on compatibility across a wide range of manufacturers. In the rare case where we do not have a compatible part, we have a custom design team available to provide a solution. 

We provide a comprehensive 12-month warranty on all our products.

We aim for a delivery time of 2-4 weeks. However, the specific delivery time will be confirmed at the point of order.

We offer full training and support across our entire product range. 

Yes, we have full custom design capabilities and a multidisciplinary team of scientists and engineers available to provide a solution that meets your needs. 

Our CellCams are supported in Micro-Manager. 

Customer Reviews

"The build quality of their equipment is excellent, and has proven both reliable and versatile in our lab’s day-to-day research; our Cairn equipment has provided years of dependable service."
Andrew James
“Over the past 20 years we have purchased a wide range of equipment from Cairn Research, ranging from several Optopatch amplifiers, OptoLED, Optosourse arc lamp and custom-made optical pathways for nanoscale measurements.”
Walter Marcotti
“What I love about this company is the quality and the reliability of every piece of equipment that I purchased. The instruments are made of high-grade materials (mostly aluminum for the optics components) and are intended for heavy everyday use in the laboratory. “
Andreas Werdich

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