Diopter dilemma? Read on for more information on selecting the proper magnifier for you.
A diopter is a unit of measurement describing the optical power of a lens or curved mirror. When shopping for magnifiers, consider this: The diopter is equal to the reciprocal of the focal length measured in meters. For example a 5 diopter lens brings light rays to focus at 1/5 meter. Each diopter increases the size of the viewed object by 25% when the object is at its full focal length from the lens. Remember that as the lenses become stronger and magnification increases, viewing areas and focal length decrease.
An “x” usually follows the magnification number. This “x” is used to express power or the size of the object in relationship to its actual size.
How to select the magnifier for you:
- Decide how much magnification you need. In doing so, remember that if you increase the magnification, the focal length and the viewing area will be smaller.
- Determine which diopter you need.
- Make sure you check the focal length and the diameter of the lens in accordance with your task
All-Spec Industries provides all kinds of magnifiers to fit your needs.
I need a lighted magnifier to use at the sewing machine to see the needle and presser foot as the machine stitches (sews).
Also, to use for watercolor painting.
Working distance varies. Want to be in a comfortable sitting position as I work. I am almost 20/200 in one eye and finger counting in other eye. Have macular degeneration and corneal distrophy.
Am trying to find something so I can work about 8″ distance more or less ( nire better uf oissubke)
Thank you for your advice.
Anna Bowman
I need advise for a desktop illuminated magnifyer for viewing coins.
Please consider contacting one of our customer service reps (toll free 800-537-0351) for advice on an illuminated magnifier for your specific needs.
I need a good high quality magnifying lamp for doing facials. I am confused about what diopter to use. Have looked at your lamps and have guestions. They look very sturdy. Thank you for any help you can give me on this issue.
Patricia Snelson
Hi Patricia!
I suggest you call our customer service reps to find out what diopter would work best for you. You can contact them via email (sales@all-spec.com) or phone 1-800-537-0351.
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Hi there thanks for your information for selecting the right diopter. Magnifying lamps are of great use for all. visit http://magnifyinglamp.co.cc for more details.
We’re glad the information was helpful, Rose. Thanks for the additional reference.