• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
  • Skip to footer
Vermont Photonics

Vermont Photonics

Vermont Photonics is the exclusive U.S. distributor of high quality optical test equipment and components by German manufacturer Möller-Wedel Optical GmbH.

  • About
    • About Vermont Photonics
    • About Möller-Wedel
  • Our Products
  • Applications
  • Calibration
  • Custom
  • Downloads
  • Education
    • Articles
    • Videos
  • Contact

How To Measure the Focal Power of a Lens With Dioptometers & Dynameters

October 14, 2016 By Misha Mross

When it comes to matters of the eye, accurate focus and magnification are the name of the game. Luckily, Vermont Photonics has devices known as dioptometers and dynameters, which can be used to measure and calibrate the focal power of a lens and measure the range of both focus and magnification. If you use an instrument or optic with an eyepiece, Möller-Wedel Optical dioptometers and dynameters from Vermont Photonics can help you calibrate and accurately set your eyepieces.

How To Use a Vermont Photonics Dioptometer

With a dioptometer, also referred to as a diopter telescope, in hand, you can measure the focal power of a lens in a few simple steps. First, look through the dioptometer at a uniform colored wall with the focus ring set to zero, and rotate the eyepiece of the diopter telescope until its reticle is in focus. Then, place the dioptometer on the eyepiece or telescope that you are testing. This time, the eyepiece of the telescope will be rotated until the reticle is in focus. The result will be the eyepiece being set to zero.

DioptometerWant to measure the focus range of your eyepiece? Rotate the eyepiece you’re testing to the last gradation of its scale or the end of its travel, focus the dioptometer using the focus ring, and take your reading from the diopter graduated scale. Rotate the eyepiece to the opposite end of its scale, adjust the dioptometer until the reticle is in focus, and read the diopter setting off the scale. You now have the full range of adjustability of your eyepiece and an accurate location for the zero setting.

How to use a Vermont Photonics Dynameter

Used for measuring eye relief distance and exit pupil diameter, our Möller-Wedel Optical dynameters are operated very similarly to the dioptometer. Follow the same course of action as you did for the dioptometer, focusing the dynameter first and then using it to measure the system you’re testing. The major difference between the two instruments is that the dynameter has a graduated eyepiece reticle that allows the user to measure the diameter of the exit pupil. Comparing the measured diameter of the exit pupil in the dynameter with the actual exit pupil size gives a measure fo the magnification. Eye relief can be measured directly off the vertical scale on the dynameter after adjusting it until the exit pupil is in best focus.

Applications for Dynameters and Dioptometers

These Vermont Photonics devices can be put to use anywhere eyepieces need to be adjusted, calibrated, or characterized. For example, rifle manufacturers will use dioptometers and dynameters to test the range of rifle scopes eyepiece settings and eye reliefs. They’re also used in the medical field for devices such as endoscopes and microscopes.

With its high accuracy, large range, and ease of use, Vermont Photonics’s dioptometers and dynameters are the preferred instrument for anyone looking to measure and adjust the focal power of a lens. To discover more about our dioptometers and dynameters, please visit our product pages.

Filed Under: Articles

Primary Sidebar

Testimonials:

Customer focus is really appreciated, and unfortunately too rare. I loved dealing with your company… The collimator worked flawlessly out-of-box, as compared to the previous one from another company that I never could get comfortable with in 18 years!
-Civilian contractor for the US military

Vermont Photonics
2019-06-03T21:13:03+00:00
Customer focus is really appreciated, and unfortunately too rare. I loved dealing with your company… The collimator worked flawlessly out-of-box, as compared to the previous one from another company that I never could get comfortable with in 18 years! -Civilian contractor for the US military
https://www.vermontphotonics.com/testimonials/us-military-contractor/

I returned the demo equipment today, sadly. It is a really quality instrument and worked beyond my expectations. Thanks for being so easy to work with on this. I really appreciate it.
-Roylnn Serati, Boulder Nonlinear Systems

Vermont Photonics
2019-06-03T21:15:15+00:00
I returned the demo equipment today, sadly. It is a really quality instrument and worked beyond my expectations. Thanks for being so easy to work with on this. I really appreciate it. -Roylnn Serati, Boulder Nonlinear Systems
https://www.vermontphotonics.com/testimonials/boulder-nonlinear-systems/

It is a pleasure to deal with suppliers that take ownership and deliver a great product.
-Global eye care device manufacturer

Vermont Photonics
2019-06-03T21:16:01+00:00
It is a pleasure to deal with suppliers that take ownership and deliver a great product. -Global eye care device manufacturer
https://www.vermontphotonics.com/testimonials/eye-care-device-mfr/

The modifications were very nicely done and we are now able to measure to the center of an eight inch plate, which we’ve long wanted to do. The new software and user interface is great. It’s very easy to learn and operate and our work gets done much faster than before.
-Optical Filter Manufacturer

Vermont Photonics
2019-06-03T21:17:58+00:00
The modifications were very nicely done and we are now able to measure to the center of an eight inch plate, which we’ve long wanted to do. The new software and user interface is great. It’s very easy to learn and operate and our work gets done much faster than before. -Optical Filter Manufacturer
https://www.vermontphotonics.com/testimonials/optical-filter-mfg/

I was VERY happy with the communication and general ‘on the ball’ status of your company… Cal service turnaround was something like a week, stupendous by any standard.
-Major Interferometer Manufacturer

Vermont Photonics
2019-06-03T21:59:19+00:00
I was VERY happy with the communication and general ‘on the ball’ status of your company… Cal service turnaround was something like a week, stupendous by any standard. -Major Interferometer Manufacturer
https://www.vermontphotonics.com/testimonials/interferometer-mfr/

Service from you and your office has always been excellent – especially the quick responses to any requests or questions.
-Major US Defense Contractor

Vermont Photonics
2019-06-03T22:00:14+00:00
Service from you and your office has always been excellent – especially the quick responses to any requests or questions. -Major US Defense Contractor
https://www.vermontphotonics.com/testimonials/us-defense-contractor/

My recent experience with Vermont Photonics and Möller-Wedel products has been nothing short of exceptional.
-Designer of firearms and rescue illumination systems

Vermont Photonics
2019-06-03T22:03:46+00:00
My recent experience with Vermont Photonics and Möller-Wedel products has been nothing short of exceptional. -Designer of firearms and rescue illumination systems
https://www.vermontphotonics.com/testimonials/designer-of-systems/

I want to thank you and your team for doing an incredible job from the start. I, literally, could not have been more pleased both with your professionalism, technical expertise, and patience/support during these various contractual events.
-Lead ASTS Electro-Optical Systems Engineer, Boeing

Vermont Photonics
2019-05-27T15:46:52+00:00
I want to thank you and your team for doing an incredible job from the start. I, literally, could not have been more pleased both with your professionalism, technical expertise, and patience/support during these various contractual events. -Lead ASTS Electro-Optical Systems Engineer, Boeing
https://www.vermontphotonics.com/testimonials/boeing/

Vermont Photonics is the first company that the audit team has ever seen to have a policy for the components considered in uncertainty calculations.
-Noteworthy Practice from Quality Audit Report, Los Alamos National Laboratory

Vermont Photonics
2019-05-27T15:56:15+00:00
Vermont Photonics is the first company that the audit team has ever seen to have a policy for the components considered in uncertainty calculations. -Noteworthy Practice from Quality Audit Report, Los Alamos National Laboratory
https://www.vermontphotonics.com/testimonials/los-alamos-national-laboratory/

Dealing with suppliers such as you certainly makes my job easier. The equipment purchased enabled us to further our relationship with our customer, who is a very well-known and highly respected global automotive OEM.
-Automated lens alignment equipment manufacturer

Vermont Photonics
2019-05-29T00:11:09+00:00
Dealing with suppliers such as you certainly makes my job easier. The equipment purchased enabled us to further our relationship with our customer, who is a very well-known and highly respected global automotive OEM. -Automated lens alignment equipment manufacturer
https://www.vermontphotonics.com/testimonials/automated-lens-alignment-mfr/
0
0
Vermont Photonics

Articles:

Extension for Ground Prisms

GONIOMAT Extension for Ground Prisms – Save Time and Cost in the Production Process.

Vermont Photonics prototype angle generator

An Engineer’s Job Is Never Done: Why We’re Developing A High-Accuracy Angle Generator With Our SBIR Grant

How To Measure the Focal Power of a Lens With Dioptometers & Dynameters

Footer

Vermont Photonics Technologies Corp.

Mailing: PO Box 1398
Brattleboro, VT 05302-1398

Shipping/Physical: 471 US Route 5
Dummerston, VT 05301

Phone: 1-802-275-5210
Fax: (802) 275-5215

Product Categories

Need Support?

We firmly believe that our customer service is the best in the business. Please be in touch for assistance and support with your application, before or after a sale. Call us at 1-802-275-5210
Contact Us Today!

Copyright © 2021 · Vermont Photonics. All Rights Reserved.

  • About
  • Our Products
  • Applications
  • Calibration
  • Custom
  • Downloads
  • Education
  • Contact