Zoom Lenses
Zoom lenses have the ability to vary the focal length, and therefore the angle of view as opposed to a fixed focal length lens. A true zoom lens, also called a parfocal lens, is one that maintains focus when its focal length changes. A lens that loses focus during zooming is more properly called a varifocal lens. Varifocal zoom lenses are convenient, cost effective, and useful for a range of applications meaning you do not need to purchase a number of different lenses. They are more complex than fixed focal lenses and are also heavier and larger, with some compromise on image quality and loss of resolution at the extreme end of their focal range, so these factors need to be taken into account when choosing a varifocal zoom lens. Parfocal lenses offer a superior image resolution even when zooming but are higher in price.
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Alrad Instruments Ltd
View company profileThrough our six technology divisions, ALRAD Imaging, ALRAD Electronics, ALRAD Photonics, ALRAD Medical, ALRAD Thermal and ALRAD Vacuum, we offer thousands of product items from the world's leading manufacturers. We also provide installation, demonstration, and product support services.
We represent many of our principals as their sole distributor in the UK. Some of these exclusive companies have been with us since the 1970s, many of our distribution agreements have been in place for a very long time and that must say something about the service we offer. The products and service we provide open up new opportunities for our customers to improve quality,automation and productivity which is why many of our existing customers have been experiencing ALRAD high quality service for decades.
Alrad employ experienced staff to help our customers generate a competitive edge for their companies backed by world class products.
Alrad are members of the UKIVA (United Kingdom Industrial Vision Association) group of organizations and companies within the PPMA ( Processing and Packaging Machinery Association).
ALRAD Imaging supplies imaging components, equipment and services to both industrial system integrators, OEMs, scientific and research customers.
ALRAD Electronics provides a wide range of optical detectors, laser products, high voltage components, optoelectronic sockets, analytical systems and densitometers.ALRAD Photonics offers Infrared detectors, power supplies, laser diode modules, photodetectors, optoelectronic components , optical filters, diffraction gratings and laser accessories.
ALRAD Medical is responsible for the marketing and sales of air disinfection systems, endoscope cameras, medical screening, molecular detection, personal protection equipment, temperature screening, UV sterilization and UV C Germicidal LED Lighting.
ALRAD Thermal is responsible for marketing and sales of automotive thermal cameras, commercial vision thermal cameras, thermal industrial cameras, thermal security cameras and thermography thermal cameras
ALRAD Vacuum provides a range of product for high vacuum and space applications including electron multipliers, long distance microscopes for vacuum chamber ports and vacuum image sensors
If you need any help in selecting the right product for your application
please call our friendly sales office on 01635 937000
we will be pleased to assist you.
