3. An aspherical lens element has much more precise control of how light travels inside your lens. So much so, that one asphere can oftentimes negate the need for many of the standard lens elements that would otherwise be needed to achieve the same effect.

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The aspherical glass lenses used in top-of-the-line telephoto and wide-angle lenses are particularly expensive. They’re usually ground and polished by hand.

Learn about the benefits of aspherical lenses (Asph Lens) in photography and why you should (or shouldn't) attach one to your camera in 2023.

Ideally, light rays, when passing through a camera lens element, would all converge at a single point thereby creating a sharp focus. Unfortunately, this isn’t the case with many spherical lenses.

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An aspherical lens is simply a lens that doesn’t have a spherical surface shape. Instead, it has an aspheric surface (i.e. non-spherical), usually with counter-curves near its edges.

In the past, only pros could afford such top-of-the-line optics. These days they’re still spendy, but at least they’re not completely the ballpark for ordinary photographers.

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One way to compensate for this is by using a combination of concave and convex lens elements. Another way is by using an aspheric lens.

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It’s really amazing how far modern optics have come. Not too long ago, only pros could afford full-frame cameras and aspherical lenses. Now those of us in the prosumer world can get them too.

The lens surface of an aspherical lens corrects for this, making it possible to shoot at wider apertures and allowing us to use the entire surface of the lens.

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As you can imagine, aspherical lenses aren’t just used in cameras. They’re a vital part of any system that needs a high standard of optical quality, from telescopes and contact lenses, to rifle sights and missile-guidance systems.

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1. Physically, spherical lenses have a front surface that is spherical, meaning the curve is the same from top to bottom and left to right – like a portion of a sphere.

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Aspherical lenses have at least one surface that is not spherical. Optical Engineers typically consider the aspheres to be non-spherical, rotational symmetric ...

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Aspherical lenses are curved outwards on their rear element so that they can better direct light rays into a single focal point. These counter-curves help correct spherical aberration, creating sharper images.

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These counter-curves direct light rays hitting the edges of a lens to converge at the same point of focus as the light rays hitting the center.

Aspherical lenses are used primarily in high-end optics to create sharper images and reduce or eliminate certain optical imperfections (i.e. chromatic aberrations, field curvature, etc.).

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Maybe you’re looking at buying a new lens and aren’t sure if you should fork out the extra cash for the one marked “Asph Lens,” or you’re just wondering what makes aspheric lenses expensive.

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Absolutely! They’ll make your lens lighter, your images sharper, and bring aberrations and distortion down to near zero. The only downside is how much they cost.

Learn about the benefits of aspherical lenses (Asph Lens) in photography and why you should (or shouldn't) attach one to your camera in 2023.

They also allow manufacturers to create smaller and lighter lenses since they reduce the need for numerous lens elements and lens groups.

Designers – especially with wide-angle lenses – often have to stop-down their optical systems to exclude the corners so as to avoid an excess of field curvature.

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Either way, knowing what an aspherical lens is and what it does will help you in better understanding your gear and when it comes time to purchase new types of camera lenses, you’ll have a better idea of what to buy.

Of course, asph lenses are considerably more expensive than spherical lenses, but high-quality glass will last a lifetime, so if you can spring for the high-performing lens, go for it!

Spherical aberrations occur when incoming light rays pass through a spherical lens and focus at different points, causing blurry images and reducing overall image quality.

Size 1.000 in. (25.40 mm) 2.000 in. (50.80 mm) 5.3 x 5.3 x 2.0 in. (13.5 x 13.5 x 5.1 cm) Wavelength (nm) Specify Custom λ 405-850 Specify Custom λ 450-720 632.8 785 1064 1550 Wavelength Range (nm) 405-850 450-720 Clear Aperture 0.370 in. (9.4 mm) 0.700 in. (17.8 mm) Thickness 1.125 in. (28.58 mm) 1.230 in. (31.24 mm) 1.380 in (35.05 mm) 1.415 in. (35.94 mm) Filters Sort results Reset Apply NameItem # Dimensions Wavelength Range Clear Aperture Thickness Ferroelectric Polarization Rotator, Binary – 1.000 in. (25.40 mm), 1550FPA-100-1550 1.000 in. (25.40 mm) 1550 405-850 0.370 in. (9.4 mm) 1.230 in. (31.24 mm) Ferroelectric Optical Shutter – 2.000 in. (50.80 mm), Specify Custom λ 450-720FCS-200-𝜆 2.000 in. (50.80 mm) Specify Custom λ 450-720 450-720 0.700 in. (17.8 mm) 1.125 in. (28.58 mm) Ferroelectric Optical Shutter – 1.000 in. (25.40 mm), Specify Custom λ 450-720FCS-100-𝜆 1.000 in. (25.40 mm) Specify Custom λ 450-720 450-720 0.370 in. (9.4 mm) 1.415 in. (35.94 mm) Ferroelectric Polarization Rotator, Binary – 2.000 in. (50.80 mm), Specify Custom λ 405-850FPA-200-λ 2.000 in. (50.80 mm) Specify Custom λ 405-850 405-850 0.700 in. (17.8 mm) 1.380 in (35.05 mm) Ferroelectric Polarization Rotator, Binary – 1.000 in. (25.40 mm), Specify Custom λ 405-850FPA-100-λ 1.000 in. (25.40 mm) Specify Custom λ 405-850 405-850 0.370 in. (9.4 mm) 1.230 in. (31.24 mm) Ferroelectric Polarization Rotator, Binary – 2.000 in. (50.80 mm), Specify Custom λ 405-850FPR-200-λ 2.000 in. (50.80 mm) Specify Custom λ 405-850 405-850 0.700 in. (17.8 mm) 1.380 in (35.05 mm) Ferroelectric Polarization Rotator, Binary – 1.000 in. (25.40 mm), Specify Custom λ 405-850FPR-100-λ 1.000 in. (25.40 mm) Specify Custom λ 405-850 405-850 0.370 in. (9.4 mm) 1.230 in. (31.24 mm) Ferroelectric Polarization Rotator, Binary – 2.000 in. (50.80 mm), 1550FPA-200-1550 2.000 in. (50.80 mm) 1550 405-850 0.700 in. (17.8 mm) 1.380 in (35.05 mm) Ferroelectric Polarization Rotator, Binary – 2.000 in. (50.80 mm), 1064FPA-200-1064 2.000 in. (50.80 mm) 1064 405-850 0.700 in. (17.8 mm) 1.380 in (35.05 mm) Ferroelectric Polarization Rotator, Binary – 2.000 in. (50.80 mm), 785FPA-200-785 2.000 in. (50.80 mm) 785 405-850 0.700 in. (17.8 mm) 1.380 in (35.05 mm) Ferroelectric Polarization Rotator, Binary – 2.000 in. (50.80 mm), 632.8FPA-200-632.8 2.000 in. (50.80 mm) 632.8 405-850 0.700 in. (17.8 mm) 1.380 in (35.05 mm) Ferroelectric Polarization Rotator, Binary – 1.000 in. (25.40 mm), 632.8FPR-100-632.8 1.000 in. (25.40 mm) 632.8 405-850 0.370 in. (9.4 mm) 1.230 in. (31.24 mm) Ferroelectric Polarization Rotator, Binary – 1.000 in. (25.40 mm), 1064FPA-100-1064 1.000 in. (25.40 mm) 1064 405-850 0.370 in. (9.4 mm) 1.230 in. (31.24 mm) Ferroelectric Polarization Rotator, Binary – 1.000 in. (25.40 mm), 785FPA-100-785 1.000 in. (25.40 mm) 785 405-850 0.370 in. (9.4 mm) 1.230 in. (31.24 mm) Ferroelectric Polarization Rotator, Binary – 1.000 in. (25.40 mm), 632.8FPA-100-632.8 1.000 in. (25.40 mm) 632.8 405-850 0.370 in. (9.4 mm) 1.230 in. (31.24 mm) Ferroelectric Polarization Rotator, Binary – 2.000 in. (50.80 mm), 1550FPR-200-1550 2.000 in. (50.80 mm) 1550 405-850 0.700 in. (17.8 mm) 1.380 in (35.05 mm) Ferroelectric Polarization Rotator, Binary – 2.000 in. (50.80 mm), 1064FPR-200-1064 2.000 in. (50.80 mm) 1064 405-850 0.700 in. (17.8 mm) 1.380 in (35.05 mm) Ferroelectric Polarization Rotator, Binary – 2.000 in. (50.80 mm), 785FPR-200-785 2.000 in. (50.80 mm) 785 405-850 0.700 in. (17.8 mm) 1.380 in (35.05 mm) Ferroelectric Polarization Rotator, Binary – 2.000 in. (50.80 mm), 632.8FPR-200-632.8 2.000 in. (50.80 mm) 632.8 405-850 0.700 in. (17.8 mm) 1.380 in (35.05 mm) Ferroelectric Polarization Rotator, Binary – 1.000 in. (25.40 mm), 1550FPR-100-1550 1.000 in. (25.40 mm) 1550 405-850 0.370 in. (9.4 mm) 1.230 in. (31.24 mm) 12 Edit table

Standard lenses use spherical elements, many of which aren’t natively able to direct the light reaching its edges to the same focal point as the light reaching its center.

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