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Want to buy a Dark Field Microscope?

We can provide you a complete professional solution for dark field microscopy! More about us...
About Us
Sarras e.U.

Sarras e.U. is a consulting and trade company based in Vienna (Austria) founded in 2007. Our focus is on the equipment for optical inspections and especially the microscopy.

The equipment for the dark field microscopy is our specialty. We focus not just in the dark field microscope but instead to a complete solution for a professional and at the same time economical dark field equipment. This includes a matched combination of dark field microscope, adapter, HD microscope camera and HD monitor. In addition to the equipment, we also offer technical trainings (in German or English) in order that you will also be able to use the equipment successful.

Konstantinos Sarras (Founder and Managing Director of Sarras e.U.)


Microscope, Cameras and Accessories

In this section you will find information and the technical data sheets of the individual components, which compose our packages (sets). The individual components (e.g. the dark field microscope or the camera) are available also separately in our webshop.

Dark Field Microscope

Dark field microscope OPTIKA B-510DK
The dark field microscope OPTIKA B-510DK manufactured by OPTIKA has been designed for use in laboratories and especially for LBA examinations. It can be combined by adapter with SLRs or microscope cameras for the live image transmission to a monitor and for recordings.

Microscope Head Type: Trinocular observation head, inclined 30° and rotatable 360°.

Objektives: Plan-achromatic, infinity corrected objectives: 4X, 10X, 40X and 100X. The 100X-objective is an oil immersion objective with built-in iris (see image below). All objectives are treated with an anti-fungus treatment.
oil immersion objective 100X

Condenser: This is the core part of the dark field microscope. It has an integrated high-power LED with adjustable intensity (Colour temperature: 6.300K, LED life time: ca. 50.000 hours)

Dark Field Condenser from OPTIKA

Technical Specifications: Dark Field Microscope OPTIKA B-510DK (PDF)

HD Microscope cameras

Microscope cameras
For the live view and recording we offer two high resolution HDC models (abbr. High Definition Cameras):

  • HDC-DF4L - UHD-resolution (3840x2160), HDMI- and USB-interface
  • HDC-DF1 - HD-resolution (3840x2160), HDMI- and USB-interface
Both models are equipped with highly sensitive SONY sensors suitable for difficult light environments such as dark field or fluorescence microscopy. Below you can find a summary of their main features.
Camera with attached mouse on its USB port
HDMI Operation Mode: this is a special feature of these models: in HDMI mode, the supplied mouse can be connected to the USB port of the camera. With the mouse you can then activate the on-screen menu and use it to take pictures and videos and control all of the camera settings.

Multi signal output: The cameras can be connected directly to a HDMI monitor (via their HDMI port) or to a PC (via their USB port). You can even use both outputs in parallel. In HDMI mode they achieve up to 60 frames/sec in full resolution!

Flexible exposure times: In addition to auto-exposure mode, the cameras allow you to adjust manually exposure and gain, which we highly recommend for dark field applications. The exposure time can be adjusted nearly step-free (graduation: 1 ms).

Zoom – mirror - compare: Both the on-screen menu (HDMI mode) and the PC application offer zoom functions and the ability to mirror the image horizontally/vertically. In addition, you can divide the screen vertically in two halves: one half shows the live image and the second an existing image from your image gallery to compare preparations.

Built-In Player: Already taken pictures and videos are stored on the removable SD card of the camera. You can browse through them and have them played by the camera on the HDMI monitor - without a PC!

Technical Specifications: HDC DF1(pdf) and HDC DF4L (pdf)


Samsung Monitor ls27h650fdu
The ideal complement for your darkfield equipment with a high-quality and robust monitor from SAMSUNG. All offered monitors are reflection-free and 100% compatible with the cameras of each bundle. We currently offer 32" UHD monitors (3840 x 2160 pixels).

Optical Adapter 0,5X

optical cmount adapter
With these optical adapters, you can connect our microscope cameras to the trinocular tube of the B-510DK darkfield microscope and capture photos and HD videos.

Our adapters have a variable focal length integrated optics so that the focus deviation between the image you see through the eyepieces and the image on the screen can be eliminated.


consumables for dark field
Our darkfield starter kit includes everything you need in order to operate with the darkfield microscope and start working immediately. The contained products come from reputable manufacturers. The individual products can also be purchased separately via our webshop.

Solutions and Prices

of dark field microscopy systems

The following sets are tuned combinations for live view and image/video recording. PLUS sets also include an UHD or HD monitor. These sets cover over 90% of our customer requirements. Special compositions such as for connection to already purchased components or video stream transfer over network can be offered on request.


  • Microscope OPTIKA B-510DK
  • UHD Camera HDC DF4L
  • Camera-Microscope optical adapter
  • 32" UHD-Monitor Samsung U32J590


  • Microscope OPTIKA B-510DK
  • UHD Camera HDC DF4L
  • Camera-Microscope optical adapter
  • ---

HD Set

  • Microscope OPTIKA B-510DK
  • HD Camera HDC DF1
  • Camera-Microscope optical adapter
  • ---

In the following video, you will see a capture through the trinocular of the OPTIKA B-510DK dark field microscope, which was recorded on our demo unit.

In the following video you can see the practical use of the HDC DF1 camera - the HDC DF4L has exactly the same functions. You'll see the mouse control mechanism, zooming, recording, comparison and playing back recorded images. This setup corresponds to the HDMI mode where no PC or software installations are required for camera control and record/playback. In this video, the camera is connected to the previous model of the B-510DK which was the B-500TDK.


SARRAS e.U. Herbeckstrasse 74/5
1180 Vienna, Austria

Contact us!

Please use this form to contact us for advice or to request a written offer. We answer all incoming inquiries usually within a working day.

Order online!

All products listed here as well as an on-site installation and training can be ordered online in our webshop. Click the button below to visit our webshop.
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Sarras e.U.
Herbeckstrasse 74/5
1180 Vienna, Austria
Tel. : +43-1-9972790
Fax. : +43-1-9972790-300
Email : office@dunkelfeldmikroskop.eu
Company reg. nr.: 289101z at Commercial court of Vienna
VAT nr: ATU63138811


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