Learn how liquid lenses keep continuous focus on machine vision cameras when the working distance changes.

Optotune focus tunable lenses
Optotune lenses
Optotune lenses

Optotune lenses solve a machine vision industry problem! 

IDS Imaging camera with Optotune lens

so
Machine Vision applications requiring the inspection of objects at various heights can become a challenge as normal lens have limited depth of field.  Objects outside of the depth of field become out of focus, limiting the vision application.  Historically, a lens with motorized focus adjustment would be implemented adding complexity, cost and long cycle times.  In reality, this challenge is applicable to any imaging application requiring refocusing due to various lens working distances.

Optotune Focus tuneable lenses solves this problem eliminating motorized zoom lenses or manual intervention.

Click here NOW for full detail specifications on tunable lenses

Adding an Optotune tunable liquid lens to the optical system on a standard C-mount lens and camera, allows refocusing of the imaging system on the fly.   When used in conjunction with distance sensors, its possible to  inspect objects of various heights, refocusing within 15 milli-seconds.

For example, vision systems using 8mm to 50mm focal length lenses can be equipped with a tuneable lens in the front, typically mounted on the filter thread.  In this configuration it is possible to focus from infinity down to about 100mm  or less if spacers are added.

This solution can be applied to industrial machine vision applications, ophthalmology, laser, microscopy, postal, packaging and laser applications to name a few.

Contact 1stVision for a quote on Optotunes Tunable lenses

Technology 411
 Optotune’s focus tunable lenses are shape-changing lenses based on a combination of optical fluids and a polymer membrane. The core element consists of a container, which is filled with an optical liquid and sealed off with a thin, elastic polymer membrane. A circular ring that pushes onto the center of the membrane shapes the tunable lens. The deflection of the membrane and with that the radius of the lens can be changed by pushing the ring towards the membrane or by exerting a pressure to the outer part of the membrane or by pumping liquid into or out of the container.
Watch this video to see the Optotune liquid lens in action

Advantages

A change in lens radius of several micrometers can have the same optical effect as moving the entire lens several centimeters. In turn there are several advantages

  • Optical systems can be designed more compact, oftentimes with less lenses and usually with less or no translational movement.
  • Large working distance ranges can be achieved
  • Eliminate expensive mechanical actuators resulting in a more robust design, which can be completely closed so that no dust can enter.  Essentially no moving parts for long life cycles (> 1B cycles)
  • Weight and volume is reduced in the system.
  • Low power consumption.
  • Fast response time of systems, down to the order of milliseconds.
  • Easy installation and remote focus control
  • Advanced controls for very accurate and repeatable control of the lens using Gardasofts TR-CL180 controllers

Want to know more?  Download Optotunes comprehensive white paper here 

This white paper will review the overall principles of tunable lenses, response times, wavefront quality, drive methods, and applications.

Contact 1stVision for a quote on Optotunes lenses and discuss an overall solution with cameras, lenses and lighting if required. 

UPDATE:  Video showing some great demo’s from the Stuttgart Vision show in 2018

71MP camera now with support for Cognex priced below $10K!

71 Megapixels just got even more attractive! 

The Crowley Company has lowered the price to $9,995 for the MACHCAM industrial camera and has implemented several improvements.

Now with support for Cognex Vision Pro, this makes this camera an excellent candidate for machine vision applications requiring ultra-high resolution.

Contact us for pricing now!

For high resolution applications that required multiple cameras, you can now replace them with a single camera!

Applications include aerial surveillance, metrology, document scanning, quality control inspection & medical research to name a few.

The following enhancements have been made to the MACHCAM 71 Megapixel camera.

  • Price, Price, Price!!!   – With pricing below $10K, this truly is the lowest price per pixel now on the market!
  • Cognex Vision Pro capable / USB3 compatible – Software is now released to be compliant with Cognex Vision Pro software and other key industry 3rd party vision packages.
  • Continual improvement to noise reduction –  Noise reduction has been significantly reduced via software improvements
  • Real-time pixel correction has been implemented in the software to enhance image clarity.
  • Internal fan option  Fan options available for active cooling.
  • Color calibration creation – It’s critical to represent accurate color when capturing color images.  To accommodate this, MACHCAM users are provided with procedures to calibrate color based on the camera’s physical environment.  Additionally, The Crowley Company is offering color consultation services to help identify and correct for environmental issues (lighting, stability, etc.).   This is very important in document scanning when considering the camera for FADGI compliance.

Click here now for full camera specifications 

Key features of this camera include

  • Ultra High resolution, 71 MP @ 3 fps using the CMOSIS CHR70M image sensor
  • Small camera case for the sensor size (83 x 83 x 63.5mm ) for easy integration.
  • USB3.0 compatible / Cognex Vision Pro capable
  • Pleora Software development kit (SDK)
  • F-mount standard
  •  Available in color and monochrome.
  •  Meets NARA, FADGI and Metamorfoze image guidelines for document imaging

UPDATE Jan 1, 2019 – Crowley MACHCAM 71MP Camera VIDEO to Outline key features

 

1stVisions sales engineers have 25+ years of experience in the industrial imaging market.  Contact us to discuss your application. 

Lenses for large format cameras can also be a challenge to select.  Click here now to read about considerations in lens selection for large format image sensors / cameras. 

 

Considerations in selecting a lens for a large format camera sensor

For most cameras in the automated imaging marketplace, the sensor sizes are 1” and less. (1″  sensors have 16mm image circle/diameters)

Note the size in inches and the image circle size in millimeters do NOT match!  1” does not convert to 16mm!.  But that is a topic for another blog post!)

Industrial cameras with C/CS mount sensors normally range from ¼” to 4/3” ( up to 22mm image circle, which is the largest a C mount is by definition).

However, there are many cameras that have sensors larger than this, with many being a full 35mm sensor.  These sensors typically require larger F or EF mounts as seen in the picture above.

Click here for F-mount lenses from Kowa

Click here for F-mount lenses from Schneider

The question becomes, how do you find a suitable lens for these cameras?

First, let address the Issues with F mount lenses

The mount most commonly used by camera vendors for sensors larger than C mount are F mounts.  F mounts are most popular mount for SLR cameras, designed by Nikon about 1960. https://en.wikipedia.org/wiki/Nikon_F-mount

F mount lenses for commercial and consumer/prosumer cameras are excellent optically and priced well but there are several issues you need to consider with these lenses for automated imaging applications.

  1. First, F mount lenses are bayonet, not screw mount. That means they are not as secure as C mount, and therefore, much more prone to vibration, or even coming lose.
  2. F mount lenses for the consumer/prosumer market are designed to take fantastic color pictures. To do this, the lens coatings are optimized for color. This can affect mono images.
  3. Consumers want their cameras to be light, so the F mount lenses are made with as much plastic as possible. This is not great for industrial applications
  4. These lenses are designed for automatic focus and exposure and have controls for that in the lens itself.
  5. Finally, the last issue is that many of these lenses are designed for the automated controls with prosumer cameras, autofocus and autoexposure.

If you can find an all metal manual F mount lens from 20 to 30 years ago, it would be great for an industrial application!  If not, we suggest you turn to one of the companies that make F mount lenses specifically for this market. The major vendors are Schneider, Edmund Optics, and Kowa.  All have a series of F mount lenses that are much more rugged than a prosumer F mount lens, and also don’t have the extra controls for automatic focus/iris.  They have lock screws as well to hold their settings.  The major limitation to these lenses are that they cost more than prosumer lenses, and are in just a small range of focal lengths.

Contact us for further specifications and pricing

EF Lenses

Since many of the new large format lenses can be controlled electronically via the camera, the automated imaging industry has created several products to use these lenses. The solutions from Birger Engineering, www.birger.com are straightforward to use. They make a mount that attaches to the  camera and allows for the use of EF mount lenses.  Attached to their mount are connections to drive the lenses, via serial commands with their SW.  Several camera manufacturers have built cameras with EF mounts as part of the camera.  This is an especially nice solution since there are no wires hanging out for control, and the lens is controlled directly from the camera’s SDK.

This provides a high level overview of the considerations in selecting a lens for large format camera sensors.  1st Vision has extensive knowledge with lenses and cameras and will help you in the selection process.

Please contact us and discuss your application with our sales engineer! 

 

Related Blog posts:

Canon EF mount integrated into Allied Visions GT1930L

Imaging Basics – Calculating lens focal lengths

Not all lenses are created equal!

10 key things you need to know when selecting a machine vision lens

Improper selection of the correct quality and type of machine vision lens can make your camera selection useless!

In many cases, we see customers attempting to choose a low quality lens for a camera that really needs quality optics to resolve the pixel sizes. Conversely, we also see customers trying to over specify a lens, where you simply need a lens that’s “good enough”


1st Vision has a white paper to help in the lens selection and provide valuable knowledge on various topics to make the best decisions. 

 

In this comprehensive white paper, you’ll learn the following

  1. Background basics on lenses and what they really do!
  2. The science in some basic formulas to calculate MAG, focal length and angular FOV
  3. What are extension rings used for?
  4. How are lenses rated?  MTF explained
  5. The myth behind “Megapixel” lens ratings
  6. How many pixels do I really need?
  7. What is the ” f# ” of a lens
  8. What does the “lens format” mean?
  9. Comparison of lens types from security to Factory Automation (FA)
  10. How to get some practical advice!

Download the White Paper

1st Vision has many other resources in our educational blogs.  Please find related links to lenses below.  

We are happy to discuss your imaging application in details  Just contact us!

Links: