The surface of spherical lenses looks like it’s part of a sphere or cylinder.The curve is the same across its entire surface. If you drew a line to follow that curve, it would form a circle. Because the design is simple, spherical lens designs are usually cheaper to produce.
The surface of an aspherical lens can never be part of a sphere or cylinder. The curve changes in certain parts of the lens surface to focus the light better. This change in surface corrects all kinds of aberrations.You should use an aspherical lens if you want to reduce spherical aberration in your images.
Spherical aberration happens when light going through the camera lens focuses on different points. The light that hits the sides of a spherical lens focuses in front or behind the ideal focal point. This creates several focal points and causes spherical aberration.
It’s easy to recognize. The edges of your photos look soft and fuzzy at low f-numbers. That’s usually a sign of spherical aberration. When stopping down, the fuzziness should decrease or even disappear.
Camera lens manufacturers can solve the problem by adding more spherical lens elements. Another solution is to use aspherical lenses. Using aspherical glass lenses is more expensive.
There is a problem when using several spherical lenses to correct spherical aberration. It reduces the contrast in a photo. It could also render colours differently, and you might notice more flare in your images.
Aspherical lenses produce more colourful photos with better contrast.
Glass aspheric lens is also called condenser lens, mainly applicable for stage lighting, optical lighting system, etc. Tian Cheng bring in hot briquetting technology from Japan, with volume production ability, including aspheric lens which surface form error is within 100 micron.
Aspheric lenses are flatter than conventional lenses, but they still offer the same vision-enhancing benefits. They have a more attractive profile because there is less curvature. This means they don’t have the same “coke bottle” look as you get with traditional lenses.
Spherical lenses have a front surface that has the same curve from top to bottom and left to right.
Aspherical lenses have a surface that’s more complex. The curve changes in certain areas to correct spherical aberration.
Aspherical means “not spherical”. Its surface does not look like a part of a sphere.
You can only check if a camera lens is aspheric by looking at the individual lens elements. Usually, an aspherical lens has spherical and aspherical glass elements.
Spherical aberration isn’t always a problem. When shooting portraits wide open, you won’t even notice it.
But when you need crisp and sharp photos, using aspherical lenses is the solution.
Aspherical lenses are more expensive than spherical lenses. But a high-quality lens will last a lifetime, so it’s worth the investment.