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An internal focus lens (sometimes known as IF) is a photographic lens design in which focus is shifted by moving the inner lens group or groups only, without any rotation or shifting of the front lens element. This makes it easy to use, for example, a screwed-in polarizing filter or a petal shaped lens hood.
Concerning the curvature of the lens elements, the following statements can be drawn: Acceptable lens shapes are most bi-convex, plano-convex and mild meniscus shapes. Not unacceptable but hard to mould are bi-concave lenses, steep meniscus lenses, and lenses with severe features (e.g. a bump on a convex surface).
In contrast to soft focus lenses, STF lenses render a perfectly sharp image in the focus plane. Lenses featuring Smooth Trans Focus technology: Minolta STF 135mm F2.8 [T4.5] (introduced 1999) Sony α STF 135mm F2.8 [T4.5] (SAL-135F28) (introduced 2006) Sony FE 100mm F2.8 STF GM OSS (SEL-100F28GM) (introduced 2017) [1]
Transitions Optical is a U.S.-based company known for manufacturing photochromic lenses, which darken on exposure to specific types of light. The company was founded in 1990. [1] In 1991, Transitions Optical became the first company to commercialize and manufacture plastic photochromic lenses. [2]
With the additional Kerr lens the width on the end-mirror gets even smaller. Therefore, small end-mirrors (hard aperture) favor pulses. In Ti:Sapphire oscillators telescopes are inserted around the crystal to increase the intensity. For a soft aperture consider an infinite laser crystal with a thermal lens. A laser beam is guided like in a ...
One type of optical coating is an anti-reflective coating, which reduces unwanted reflections from surfaces, and is commonly used on spectacle and camera lenses. Another type is the high-reflector coating , which can be used to produce mirrors that reflect greater than 99.99% of the light that falls on them.
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