Back in the late 20th century among photographers, at least in the U.S., "objective" tended to refer to the first lens element or group of elements in a compound lens system. For example, with a 70-200mm f/2.8 lens with 23 elements in 19 groups, the first 2 lens elements would be considered the "objective group".

Blue isn’t the dominant wavelength in the visible part of the spectrum, but our sky appears blue on a clear day because Earth’s atmosphere scatters shorter, blue light wavelengths most effectively. The Invisible Portions of the Electromagnetic Spectrum   Infrared radiation has wavelengths from 780 nm to 1,000,000 nm (or 1 mm), longer than those of visible light. We sometimes think of infrared radiation from the Sun as heat, but infrared radiation is not quite the same thing as heat. In fact, infrared radiation may not always feel warm. Even objects we consider being very cold, such as an ice cube, give off infrared energy. Energy types on the electromagnetic spectrum are denoted by wavelength. Infrared wavelengths are longer than those of visible light, while ultraviolet wavelengths are shorter. NASA Ultraviolet radiation has shorter wavelengths than visible light, comprising the 100-400 nm part of the spectrum. There are also other types of radiation that come from the Sun, such as X-rays, gamma rays, and radio waves, that are invisible to the human eye. Only small amounts of these more unusual types of radiation reach Earth due to the protective shielding of Earth’s magnetosphere. Characteristics of the Electromagnetic Spectrum Each section of the electromagnetic (EM) spectrum has characteristic energy levels, wavelengths, and frequencies. The electromagnetic spectrum includes energy from long wavelengths (radio waves), through visible light, all the way to short-wavelength X-rays and gamma waves. NASA Radio waves, shown on the left side of the spectrum, have the lowest energies, longest wavelengths, and lowest frequencies of any type of radiation. Microwaves (like the ones used in microwave ovens) are shown just to the right of radio waves on the EM spectrum and have a little bit higher energy. Gamma rays, shown on the far right side, have the highest energies, the shortest wavelengths, and the highest frequencies. These higher-frequency radiation types are among the most dangerous to humans and can cause damage by penetrating the skin and harming cells.

In microscopes and telecopes, the objective lenses are the elements of the optical system closest to the specimen or viewed thing. In cameras, the whole optical system of lenses used for focusing the image onto a film or sensor, informally called a 'lens', is formally called a 'photographic objective'.

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The electromagnetic spectrum includes energy from long wavelengths (radio waves), through visible light, all the way to short-wavelength X-rays and gamma waves.

In the jargon of optics an objective lens is the lens (can be compound) that is the first to receive the image-forming rays from an object being examined or imaged. This lens or lens group is often called the objective lens.

Visible light makes up just a portion of the entire electromagnetic spectrum, from 380-700 nanometers.Our eyes most often perceive visible light from the Sun as white light, but in reality, it is made up of a rainbow of different colors of the spectrum. Each color in the visible part of the electromagnetic spectrum is a different wavelength of light - from longer red wavelengths to shorter blue and violet wavelengths. The visible part of the electromagnetic spectrum is often abbreviated ROYGBIV based on the first letters of each color’s name (red-orange-yellow-green- blue-indigo-violet).

Different types of energy on the electromagnetic spectrum can be grouped by wavelength, which is usually measured in nanometers (10-9 meters, or one billionth of a meter) or angstroms (10-10 meters), where 1 angstrom is approximately the diameter of an atom. It’s difficult for us to even grasp how tiny some of these energy wavelengths are: the wavelengths associated with visible light (about 500 nm) are about the size of a protozoan, a single-celled organism. In comparison, a single sheet of paper is about 100,000 nm thick. The differences between wavelengths of electromagnetic energy are important for determining the radiation types reaching Earth. The Solar Spectrum Energy from the Sun reaches Earth as solar radiation, which composes just one part of the full electromagnetic spectrum. Solar radiation includes the visible light we see and many other “colors,” or wavelengths, of energy that are beyond the range of human vision. Solar energy consists primarily of visible light that we see and infrared radiation that we can sometimes feel as heat. Public domain Visible light represents about 47% of the energy Earth receives from the Sun. Over half of the Sun’s energy reaches Earth as infrared energy, which is invisible but which we can sometimes experience similarly to heat. Ultraviolet (UV) radiation, which is also invisible, makes up about 2% of the solar spectrum. Visible Light - The Part of the EM Spectrum that We See Visible light makes up just a portion of the entire electromagnetic spectrum, from 380-700 nanometers.Our eyes most often perceive visible light from the Sun as white light, but in reality, it is made up of a rainbow of different colors of the spectrum. Each color in the visible part of the electromagnetic spectrum is a different wavelength of light - from longer red wavelengths to shorter blue and violet wavelengths. The visible part of the electromagnetic spectrum is often abbreviated ROYGBIV based on the first letters of each color’s name (red-orange-yellow-green- blue-indigo-violet). The visible light region of the electromagnetic spectrum is made up of different-sized wavelengths of light. Each wavelength defines a unique color. All wavelengths of visible light together make up white light. Windows to the Universe/Randy Russell Blue isn’t the dominant wavelength in the visible part of the spectrum, but our sky appears blue on a clear day because Earth’s atmosphere scatters shorter, blue light wavelengths most effectively. The Invisible Portions of the Electromagnetic Spectrum   Infrared radiation has wavelengths from 780 nm to 1,000,000 nm (or 1 mm), longer than those of visible light. We sometimes think of infrared radiation from the Sun as heat, but infrared radiation is not quite the same thing as heat. In fact, infrared radiation may not always feel warm. Even objects we consider being very cold, such as an ice cube, give off infrared energy. Energy types on the electromagnetic spectrum are denoted by wavelength. Infrared wavelengths are longer than those of visible light, while ultraviolet wavelengths are shorter. NASA Ultraviolet radiation has shorter wavelengths than visible light, comprising the 100-400 nm part of the spectrum. There are also other types of radiation that come from the Sun, such as X-rays, gamma rays, and radio waves, that are invisible to the human eye. Only small amounts of these more unusual types of radiation reach Earth due to the protective shielding of Earth’s magnetosphere. Characteristics of the Electromagnetic Spectrum Each section of the electromagnetic (EM) spectrum has characteristic energy levels, wavelengths, and frequencies. The electromagnetic spectrum includes energy from long wavelengths (radio waves), through visible light, all the way to short-wavelength X-rays and gamma waves. NASA Radio waves, shown on the left side of the spectrum, have the lowest energies, longest wavelengths, and lowest frequencies of any type of radiation. Microwaves (like the ones used in microwave ovens) are shown just to the right of radio waves on the EM spectrum and have a little bit higher energy. Gamma rays, shown on the far right side, have the highest energies, the shortest wavelengths, and the highest frequencies. These higher-frequency radiation types are among the most dangerous to humans and can cause damage by penetrating the skin and harming cells.

Among "non-photographers" in English speaking countries, I would think that "lens" would be much more understandable than "objective". Pretty much anyone who understands the technical meaning of "objective" used in the context of an optical system would also understand what "lens" means. The obverse would not be the same case, not everyone who understands what a "lens" is would also understand what "objective" means when used in the same context. There are many English speaking photographers who have not a clue where their camera's "objective" is located. They all know what "the lens" is.

Objective lens meaningin physics

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Radio waves, shown on the left side of the spectrum, have the lowest energies, longest wavelengths, and lowest frequencies of any type of radiation. Microwaves (like the ones used in microwave ovens) are shown just to the right of radio waves on the EM spectrum and have a little bit higher energy. Gamma rays, shown on the far right side, have the highest energies, the shortest wavelengths, and the highest frequencies. These higher-frequency radiation types are among the most dangerous to humans and can cause damage by penetrating the skin and harming cells.

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As someone who is an English speaker and has been doing photography for almost 50 years, I'd say that a compound lens system is usually called a "lens" when used in the context of creative photography, which is what Photography.SE is mostly about. We even call catadioptric mirror + lens systems used on cameras "mirror lenses."

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Though it is true that in the nomenclature of optical physics, lens refers to a single optical element, in the nomenclature of cameras, "lens" can and does often refer to the entire light gathering optical system made up of many lens elements and even mirrors.

Blue isn’t the dominant wavelength in the visible part of the spectrum, but our sky appears blue on a clear day because Earth’s atmosphere scatters shorter, blue light wavelengths most effectively.

If the predominant aspect of the optics is lenses, you lose nothing by writing 'lens'. If they are a mirrors or a mix of mirrors and lenses, you might say 'optical elements'. Of course, if the buyers are technically savvy, you could say 'objective'.

There are also other types of radiation that come from the Sun, such as X-rays, gamma rays, and radio waves, that are invisible to the human eye. Only small amounts of these more unusual types of radiation reach Earth due to the protective shielding of Earth’s magnetosphere.

Electromagnetic radiation is energy that travels as particles or waves, spreading out as it goes. The majority of the electromagnetic radiation that affects the Earth comes from the Sun. We can understand this radiation by looking at its range of wavelengths and frequencies, from the longer wavelength, low-frequency radio waves, to shorter wavelength, high-frequency gamma waves. Together, all of these different energy types, most of them invisible, are called the electromagnetic (EM) spectrum, or spectrum for short.

Visible light represents about 47% of the energy Earth receives from the Sun. Over half of the Sun’s energy reaches Earth as infrared energy, which is invisible but which we can sometimes experience similarly to heat. Ultraviolet (UV) radiation, which is also invisible, makes up about 2% of the solar spectrum.

Objective lens meaningmicroscope

So we have a camera looking through an optical device. And the question is: Is it a lens or an objective? Or anything else?

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This material is based upon work supported by the NSF National Center for Atmospheric Research, a major facility sponsored by the U.S. National Science Foundation and managed by the University Corporation for Atmospheric Research. Any opinions, findings and conclusions or recommendations expressed in this material do not necessarily reflect the views of the U.S. National Science Foundation.

As I tech writer, I understand your concern. "Lens" refers to a single optical element. A compound lens is a single optical element with multiple focal properties, such as a bifocal lens. An "objective" is an assembly of multiple lenses.

Because your audience is technical, you should use the most precise term -- and include an explanation or definition. For example: "The objective is the part of the device that gathers and focuses light to produce an image. The objective is composed of multiple lenses." (It might include other devices too, such as mirrors)

Energy from the Sun reaches Earth as solar radiation, which composes just one part of the full electromagnetic spectrum. Solar radiation includes the visible light we see and many other “colors,” or wavelengths, of energy that are beyond the range of human vision.

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Different types of energy on the electromagnetic spectrum can be grouped by wavelength, which is usually measured in nanometers (10-9 meters, or one billionth of a meter) or angstroms (10-10 meters), where 1 angstrom is approximately the diameter of an atom. It’s difficult for us to even grasp how tiny some of these energy wavelengths are: the wavelengths associated with visible light (about 500 nm) are about the size of a protozoan, a single-celled organism. In comparison, a single sheet of paper is about 100,000 nm thick. The differences between wavelengths of electromagnetic energy are important for determining the radiation types reaching Earth.

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We have a long ongoing discussion about weather to use the word "objective" or the word "lens" for the exchangeable package of optics that are in front of the camera.

Based on one quarter (as opposed to semester - if that doesn't date me as a fossil nothing does) of 'German Language and Culture' back in my college days, I'd say that the way most German speakers use das objektiv is very similar to the way most English speakers use the lens.

Objective lensbinoculars

Infrared radiation has wavelengths from 780 nm to 1,000,000 nm (or 1 mm), longer than those of visible light. We sometimes think of infrared radiation from the Sun as heat, but infrared radiation is not quite the same thing as heat. In fact, infrared radiation may not always feel warm. Even objects we consider being very cold, such as an ice cube, give off infrared energy.

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The visible light region of the electromagnetic spectrum is made up of different-sized wavelengths of light. Each wavelength defines a unique color. All wavelengths of visible light together make up white light.

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Types ofobjectivelenses

Radio waves, shown on the left side of the spectrum, have the lowest energies, longest wavelengths, and lowest frequencies of any type of radiation. Microwaves (like the ones used in microwave ovens) are shown just to the right of radio waves on the EM spectrum and have a little bit higher energy. Gamma rays, shown on the far right side, have the highest energies, the shortest wavelengths, and the highest frequencies. These higher-frequency radiation types are among the most dangerous to humans and can cause damage by penetrating the skin and harming cells.

I'm working at a German company that is building production machines. These machines are using cameras and microscopes to align small structures. Because we sell them worldwide we have to properly name the parts in English.

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Ultraviolet radiation has shorter wavelengths than visible light, comprising the 100-400 nm part of the spectrum. There are also other types of radiation that come from the Sun, such as X-rays, gamma rays, and radio waves, that are invisible to the human eye. Only small amounts of these more unusual types of radiation reach Earth due to the protective shielding of Earth’s magnetosphere. Characteristics of the Electromagnetic Spectrum Each section of the electromagnetic (EM) spectrum has characteristic energy levels, wavelengths, and frequencies. The electromagnetic spectrum includes energy from long wavelengths (radio waves), through visible light, all the way to short-wavelength X-rays and gamma waves. NASA Radio waves, shown on the left side of the spectrum, have the lowest energies, longest wavelengths, and lowest frequencies of any type of radiation. Microwaves (like the ones used in microwave ovens) are shown just to the right of radio waves on the EM spectrum and have a little bit higher energy. Gamma rays, shown on the far right side, have the highest energies, the shortest wavelengths, and the highest frequencies. These higher-frequency radiation types are among the most dangerous to humans and can cause damage by penetrating the skin and harming cells.

Energy types on the electromagnetic spectrum are denoted by wavelength. Infrared wavelengths are longer than those of visible light, while ultraviolet wavelengths are shorter.