What is focal lengthof lens

* The GXR interchangeable unit camera system has camera units with a fixed focal length lens and camera units with a zoom lens.

Focal lengthcamera

A conversion lens is attached to a lens to enable it to take photos with a wider angle or stronger telephoto magnification.

Reach for a rugged Fluke 61 IR Thermometer for jobs that require measuring temperature in hard-to-reach, hot, rotating, or dangerous situations. The Fluke 61 non-contact thermometer delivers accurate readings over a broad temperature range from -18 to 275°C (-0 to 525°F). Plus, the enhanced optics allow you to measure smaller objects further away.Monitor the status of electrical motors and electrical panels, research heating and ventilation problems and diagnose car malfunctions all with a comfortable, easy-to-use, handheld non-contact thermometer.

Focal lengthformula

• Bright laser beam provides easy targeting • Display clearly supplies data at a glance • Shock-absorbing holster increases ruggedness • 0.2°C (0.5°F) resolution up to 275°C (525°F) • Backlight illuminates the screen in the dark • Automatic sleep mode after 7 s extends battery life • Alkaline batteries provide 4000 typical measurements

• Bright laser beam provides easy targeting • Display clearly supplies data at a glance • Shock-absorbing holster increases ruggedness • 0.2°C (0.5°F) resolution up to 275°C (525°F) • Backlight illuminates the screen in the dark • Automatic sleep mode after 7 s extends battery life • Alkaline batteries provide 4000 typical measurements

This is a lens used for close-up photography. A macro lens can shoot from a distance closer to the subject than a regular lens. The GXR interchangeable unit camera system has a camera unit with a 50 mm macro lens. Link to more information on GXR camera unit

Alpha Controls & Instrumentation values all our customers who have placed their trust in us for over the past 40 years. LEARN MORE ABOUT US

Focaldistance vsfocal length

Infrared thermometer for jobs requiring temperature measurement in hard-to-reach, hot, rotating, or dangerous situations

focallength是什么

The angle indicating the width of the field included in the photo is called the "angle of view." A wide-angle lens has a wide angle of view and a telephoto lens has a narrow angle of view.

FOV tofocal length

With a zoom lens, when you turn on macro mode and move as close as possible while still keeping the subject in focus, the minimum distance to the subject and the size of the subject in the frame will differ depending on whether the lens is at a wide-angle or telephoto zoom position. With a wide-angle setting you may be too close and with a telephoto setting you may be too far away so adjust the focal length to find the one that makes it easiest to take the shots you want.

Even if the focal lengths of the lenses of two digital cameras are the same, the angle of view can vary depending on the size of the image sensor used in each. To make it easier to understand angle of view, focal length is often expressed as "__ mm equivalent," which means it has been converted to the 35 mm film camera format that has been historically the most common. Here on this site also, we state focal lengths that are converted into 35 mm film camera format.

Attaching a 1.88x teleconversion lens to a 72 mm lens gives an angle of view equivalent to a 135 mm medium telephoto lens.

focallength中文

Attaching a 0.75x wide conversion lens to a 28 mm lens gives an angle of view equivalent to a 21 mm ultra wide-angle lens.

Reach for a rugged Fluke 61 IR Thermometer for jobs that require measuring temperature in hard-to-reach, hot, rotating, or dangerous situations. The Fluke 61 non-contact thermometer delivers accurate readings over a broad temperature range from -18 to 275°C (-0 to 525°F). Plus, the enhanced optics allow you to measure smaller objects further away.Monitor the status of electrical motors and electrical panels, research heating and ventilation problems and diagnose car malfunctions all with a comfortable, easy-to-use, handheld non-contact thermometer.

The distance from the center of the lens to the image focal point (=image sensor surface) is known as the focal length. It is expressed in millimeter (mm) units. A lens with a short focal length is a wide-angle lens and one with a long focal length is a telephoto lens.