Modulation transfer function

A magnifying lamp is an essential tool for anyone working with precision assembly, inspection or design. Because users can effortlessly view smaller details, lighted magnifying lamps are tremendously helpful in reducing eye strain and preventing vision fatigue. As a result, they are popular with jewelers, watch and electronics repair, dental clinics, industrial inspection, scientific research laboratories and the home office.

Laser Optronic S.r.l. Via B. Quaranta, 57 20139 Milano – IT P.I. 06109950151 Codice SDI KRRH6B9 Tel:      +39 02 574651 Info commerciali o generiche: lop@laseroptronic.it Amministrazione: amministrazione@laseroptronic.it

LensMTF

Do I need a "lighted" magnifier? Good, clean lighting is an essential element to consider when choosing a magnifier. Many workplace locations have indirect and shadow-filled lighting conditions at best, resulting in marginal viewing performance. Lighted magnifiers compensate for this with a quality fluorescent, halogen or LED lighting element embedded around the viewing glass frame. Fluorescent lighting brings out clarity of view by shining a broad, cool and shadowless light. Halogen lamps will yield a warmer glow and heat up more quickly. LED lamps put out less lighting, yet tend to last much longer than either fluorescent or halogen bulbs.

What does 'Diopter' mean? When looking at various magnifiers, you'll come across the term 'diopter'. This refers to the amount of curvature a lens will have. More curvature means a thicker lens, more magnification and a higher diopter number. To find the magnification level of a lens, simply divide its diopter by 4, and add 1. For example, if you're looking at a 3-diopter lens, it's magnification = ¾ + 1... or .75 + 1 = 1.75x. Objects viewed under a 3 diopter lens will appear 175% bigger than normal. A 5-diopter lens = 5/4 + 1... or 1.25 + 1 = 2.25x. Objects viewed under a 5 diopter lens will appear 225% bigger than normal.

We offer a cost effective and modular optical test bench to measure Modulation Transfer Function (MTF) and transmittance of optical components in the Visible, SWIR, MWIR and LWIR spectral ranges. In addition to the basic MTF and transmittance measurements, other lens parameters such as EFL, BFL/FFL, distortion, and field curvature can be measured. The OptiShop design enables the user to switch from MTF to transmittance measurements without the need of re-alignment. The OptiShop allows for video and slit scanning MTF test.

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What does it mean to be ESD-Safe? Electrostatic Discharge (ESD), is defined as the transfer of electric charge, just like the spark of static electricity you get when walking across a carpet and touching someone's hand or a piece of metal. This discharge, while harmless to humans, can be damaging to delicate electrical circuit boards and sensitive components, which in turn, could cause severe injury to people working with the equipment. ESD-Safe magnifiers have special polymers applied to the lens, dissipative paints applied to the metal and the electrical layout is designed to minimize electrical discharge potential. They must also pass rigid ESD certification testing standards.

Ufficio di Roma Via N. Tommaseo, 3 00063 Campagnano di Roma (RM) – IT P.I. 06109950151 Codice SDI KRRH6B9 Tel:       +39 06 9041786 Info commerciali o generiche: lop@laseroptronic.it Amministrazione: amministrazione@laseroptronic.it

Whereas the slit scan method is the traditional way of measuring optical systems’ MTF, now modern digital cameras from visible to far IR spectral ranges allow shorter testing times.  CI’s video capture MTF option allows for real-time measurement of optical components as well as systems. It is used when high throughput test rate is required. CI Systems has a developed diffraction limited, chromatically corrected objective for the SWIR, MWIR and LWIR MTF tests. It enables adequate sampling and low aliasing. OptiShop is designed to be useful as a quality test system for a wide range of FLIR’s and other cameras.

MTFtesting Mastercard

What is meant by 'Field-Of-View' (FOV)? The field of view is the size of the magnified area that is in focus under the lens. The higher your magnification, the smaller your field-of-view. Lets go back to our flashlight example. As you move the flashlight closer to the wall (stronger magnification), the spot of light (field-of-view) will shrink.

2. Make sure the lens is positioned to keep your object in focus, with your eyes are 8” to 10” away from the glass. This will give you the best magnification with the least amount of distortion.

Organizzazione con sistema per la qualità certificato da Dasa-Rägister S.p.A. in conformità alla UNI EN ISO 9001:2015 IQ-0223-04

Do I need "HANDS-FREE" viewing? One of the main benefits of a magnifying glass is the ability to use both hands to work with the object while under magnification. When repairing electronics or other close-in work, hands-free operation is absolutely essential.

MTF

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3. For best results, keep your chair height and working surface positioned to maintain good posture. You shouldn't be leaning away from the lens when viewing the object.

What does focal length mean? Focal length is defined as the distance from the lens to the point where an object is in focus (focal point) and it becomes important if you need space above the object in which to work. It's kind of like shining a flashlight on a dark wall. As you move the flashlight (magnifier) closer to the wall, you are reducing its distance (focal length). As you move the flashlight back from the wall, the distance (focal length) increases. Unfortunately, you can't have lots of magnification and lots of room below the lens (focal length). If you need lots of space to work, you won't have as much magnification available. If you don't need much working space, you can get stronger magnification, and in fact, magnifiers with higher power are generally reserved for close-in inspection and measurement... 3 diopter = 1.75x magnification at 13” focal length 5 diopter = 2.25x magnification at 8” focal length 7 diopter = 2.75x magnification at 5.5” focal length As a general rule of thumb, when your magnification gets larger, your lens and focal length get smaller.