Glasses lens types | How to choose spectacle lenses | All
Anti-reflective coating is especially important if you choose high-index lenses, because the higher the refractive index of a lens material, the more light the lenses reflect. In fact, high-index lenses can reflect up to 50 percent more light than CR-39 lenses, causing significantly more glare, unless AR coating is applied. UV-blocking treatment
For spectacle wearers | Hoya Vision Care
Understanding Your Vision. When consulting Eye Care Professionals, you're in good hands. They should know how to guide and advise you all the way to the prescription and spectacles that optimally meet your needs and preferences. However, to understand and actively take part in decisions along the way, it's good to know the basics and understand
Camera Lenses Explained - How to Choose the Right Lens
First, use a wide angle lens to its advantage, using its properties of enhancing perspective and inclusion. Then create an image using a telephoto or long zoom (100mm or longer), using it to isolate a subject, and compress perspective. Please share your images with us in the comments section below.
Factors to Consider in Choosing an IOL for Cataract Surgery
With an LAL, your ophthalmologist will be able to adjust the lens for any leftover refractive error after your eye heals so that you don’t need glasses for distance vision. This adjustment can include astigmatism. Monovision can also be set to allow both near and distance vision without glasses.
Understanding Camera Lenses & How to Choose the Right Lens
Understanding Camera Lenses & How to Choose the Right Lens By SC Lannom on July 4, 2025 Types of Lenses Prime Lens Zoom Lens Anamorphic Lens Lens Basics More About Lens Types Focal Lengths Wide Angle Lens (14mm – 35mm) Standard (35mm – 70mm) Telephoto Lens (70mm – 200mm) More Focal Lengths Specialty Lenses Macro Lens Fisheye Lens Tilt-Shift Lens
- What is a 75mm Double Gauss-type fixed focal length lens?
- Figure 1: A 75mm double gauss-type fixed focal length lens focused at two different WDs. Note that the spacing between each element did not change as WD shifts. Fixed focal length lenses should be used for the vast majority of machine vision applications, as they are flexible and have great performance.
- Which lens is focused at a 200mm WD?
- The top lens is focused at optical infinity, and the bottom lens is focused at a 200mm WD. It is important to remember that true fixed focal length lenses will always behave as in Figure 1, though some lenses exist that have a “floating element focus,” where the relative element spacing does change through focus.
- Are Huygens eyepieces good for low power achromats?
- Usually, the simple Huygens eyepieces without any additional indication were intended for the low power achromats. However, Carl Zeiss had brought the compensation for all objectives to the same level. The same was the case when both Leitz and Olympus started producing 45 mm objectives.
- Which eyepiece compensates the best?
- The older 37 mm lenses from Leitz and Olympus still needed different amounts of compensation. Carl Zeiss Oberkochen only made compensating eyepieces and they were designated C, Cpl, KF and Kpl. The C-eyepieces have the least correction and the Kpl eyepieces compensate the best.
- What lens do you use for a microscope test?
- For the tests I used an Olympus PEN E-PL1 camera with a Sigma 30 mm lens or an Olympus 17 mm Pancake lens as relay optics between eyepiece and sensor. With the Pancake lens it is possible to photograph the entire microscope field and to detect optical aberrations up to the edge of the field of view.
- Is a lens specification sheet difficult?
- Lens specification sheets (or datasheets) vary between manufacturers, which can make comparisons a daunting task. Oftentimes, however, the problem is not as complicated as that, as it can be challenging enough to determine even the type of lens that is required for a particular application. Is a fixed focal length lens the best choice?
