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Olympus CX33 – upright laboratory microscope for digital photographic documentation at an attractive price

The Olympus CX33 is an affordably priced infinity-corrected routine microscope designed for standard imaging applications in biology and medicine. It is equipped with a trinocular tube and the powerful Olympus UIS2 optical system, which also makes it a good fit for photography applications.

In our digital world, photographic and video documentation has become part of routine work life in many fields. Modern digital cameras are excellent and easy-to-use tools for telemedicine and the professional exchange with colleagues via TeamViewer, Zoom or other software applications. With our LM microscope adapters, a wide range of these powerful cameras can be used to take digital photos though the CX33. The camera can be attached to the phototube or the eyepiece tube of the microscope.

The optical system of a microscope is a key aspect for photographic applications. Here, the CX33 (launched in 2017) scores points with the advanced UIS2 infinity-corrected optical system from Olympus. The microscope employs plan achromat objectives, which provide high-quality images over a wide field of view. The nosepiece supports up to four objectives. The built-in LED light source is maintenance-free and has a life span of up to 60,000 hours. The illumination unit is equipped with an Abbe condenser with a maximum aperture of 1.25 (oil-immersion type).

The following plan achromat objectives are available for the CX33:
4X NA 0.1 W.D. 27.8 mm
10X NA 0.25 W.D. 8.0 mm
20X NA 0.4 W.D. 2.5 mm (optional)
40X NA 0.65 W.D. 0.6 mm
100X NA 1.25 W.D. 0.13 mm (optional)

The objectives are treated with anti-fungal agents to inhibit fungal growth in a hot and humid environment. With a standard 10x eyepiece, the microscope provides a range of overall magnification from 40x to 1,000x.

The concept of the Olympus CX series of microscopes is well thought-out and delivers superior ergonomics and ease-of-use. Well-placed focus knobs (up to 2.5 µm) and a comfortable eyepiece height with a viewing angle of 30 degrees and adjustable interpupillary distance make work easier and more efficient. The eyepieces are available as 10x (field number 20) or 15x (field number 16). A 10x widefield eyepiece provides a field number of 22. With a weight of around 7 kg and a compact size of 430 x 211 x 397 mm, the CX 33 adds flexibility and convenience to microscope work. 

An interesting feature for photography is the light path selector lever on the phototube, which enables light path switching between eyepiece tube and phototube. However, there is only a choice between 100/0 and 0/100, i.e. 100% of the light path is directed to either the eyepieces or the phototube, which means that it is not possible to simultaneously view the specimen through the eyepieces and on the camera display.

The CX33 offers brightfield and darkfield modes. If phase contrast or fluorescence are also required, we recommend the slightly more complex sister model of the CX33, the CX43.

Trinocular head Olympus CX33

The camera port of the CX33 is positioned slightly higher, but has the same diameter as that of the CX43, meaning that the same adapter solution fits both models. 

Adjust DSLR system camera to Olympus CX with LM microscope adapter

Shown in the image: adapter solution with CX43

As an alternative, the camera can also be attached to the eyepiece tube (30 mm inside diameter) by removing one eyepiece and putting the camera-adapter combination into its place. 

Olympus CX33 with DSLR camera on eyepiece tube eyepiece camera

In terms of cameras, there is a wide selection to choose from: Industrial cameras or dedicated microscope C-mount cameras do a good job at less demanding routine tasks. If better image quality is required, we recommend camera systems with large (APS-C or full-frame) sensors that deliver the best possible image quality, i.e. either DSLR or system cameras. They offer an excellent price/performance ratio and are very well suited for microscopy because of their powerful sensors and the possibility to control them remotely from a PC, tablet or smartphone. Further information on making a camera selection can be found on the following info pages: camera recommendations and camera ranking for microscopy

Conclusion: The Olympus CX33 is an affordably priced, lightweight entry-level microscope that is a great fit for microscope photography because it has a trinocular tube. The microscope, including trinocular head, LED illumination and four objectives, is sold in stores for around EUR 2,600 (as of May 2020).


Fitting the microscope to digital single-lens reflex (DSLR), system or C-mount cameras is easy with our LM digital SLR adapters, which feature a plan achromatic optical system. Our products make it possible to capture top-quality microscope images. To help you select the adapter that is right for your camera, we have set up an online configurator on our website. You can also email us – ideally with attached photographs of your microscope.

Modern DSLR and system cameras offer the latest technology and are generally very well suited for microscopy applications. Most of them can be controlled remotely via PC/Mac. Because of their high sales volumes, they offer an excellent price/performance ratio compared to special-purpose microscope cameras.

Features of top DSLR and system cameras:
- Large, powerful full-frame sensors (36 x 24 mm)
- Sensor resolution of 50 megapixels
- High light sensitivity (ISO 100,000+)
- Extensive dynamic range (up to 14 aperture stops/f-stops)
- Short exposure times (1/8000 second):
- Full/Ultra HD (4k) video function
- Live video capture on external monitors in ultra HD quality

In most cases, these cameras are significantly more powerful than microscope cameras with smaller sensors (1/2" or 2/3"). On our website you will find our current camera recommendations and a camera ranking which is specifically tailored to microscopy applications.

New LM Digital Adapter for: Sony Alpha 9 II (ILCE-9M2) / Sony Alpha 9 / Nikon D6 / Sony Alpha 7R IV / Canon EOS R5 with Canon Adapter EF-EOS R / Sony Alpha 7S II / Sony Alpha 7R III / Canon EOS R6 with Canon Adapter EF-EOS R / Nikon Z6 / Nikon Z6II / Sony Alpha 7R II / Nikon Z7 / Nikon Z7II / Canon EOS R with Canon Adapter EF-EOS R / Canon EOS Ra (Astro) with Canon Adapter EF-EOS R / Nikon Z5 / Sony Alpha 7C / Canon EOS RP with Canon Adapter EF-EOS R / Sony Alpha 7S / Canon EOS 1D X Mark III / Nikon Z50 / Nikon D850 / Canon EOS 1D X Mark II / Nikon D780 / Sony Alpha 7III / Nikon D5 / Sony Alpha 6600 / Sony Alpha 6400 / Sony Alpha 6100 / Canon EOS 1D X / Nikon D4s / Olympus OM-D E-M5 III / Canon EOS 90D / Canon EOS 5D Mark IV / Nikon D4 / Nikon D750 / Canon EOS 6D Mark II / Fujifilm X-T4 / Fujifilm X-T3 / Sony Alpha 6300 / Sony Alpha 6500 / Nikon D500 / Nikon D810 / Nikon D800 / Canon EOS M6 Mark II / Nikon D800E / Nikon Df / Panasonic Lumix DC-G9 / Nikon D610 / Nikon D600 / Canon EOS 250D / Canon EOS 850D / Rebel T8i / Canon EOS 6D / Sony Alpha 99 II (SLT-A99 II) / Canon EOS M200 / Canon EOS 5DS R ( without low-pass filter) / Olympus OM-D E-M1 Mark II / Canon EOS 80D / Canon EOS 5DS / Canon EOS M50 / Sony Alpha 77 II / Canon EOS 70D / Nikon D7200 / Pentax K-1 Mark II / Canon EOS 200D / Canon EOS 800D / Rebel T7i / Canon EOS 77D / Canon EOS 5D Mark III / Canon EOS 60D / Sony Alpha 7R / Sony Alpha 7 / Nikon DS-Qi2 (Microscope Camera) / Olympus OM-D E-M5 II / Nikon D3x / Olympus OM-D E-M1 / Pentax KP / Nikon D3S / Canon EOS 750D / Rebel T6i / Canon EOS 760D / Rebel T6s / Canon EOS 5D Mark II / Nikon D7100 / Pentax K-5 / Canon EOS 1D Mark IV / Nikon D7000 / Canon EOS 7D Mark II / Canon EOS 600D / Rebel T3i / Canon EOS 650D / Rebel T4i / Canon EOS 700D / Rebel T5i / Canon EOS 2000D / Rebel T7 / Canon EOS 7D / Canon EOS 550D / Rebel T2i / Kiss X4 Digital / Canon EOS 1300D / EOS Rebel T6 / Canon EOS 4000D / Canon EOS 100D / Nikon DS-Ri2 (Microscope Camera) / Canon EOS 50D / Canon EOS 1200D / EOS Rebel T5 / EOS Kiss X70 / Canon EOS 1100D / Rebel T3 / Olympus E-5 / Sony Alpha 68 / Panasonic Lumix DMC-GH4 /