equivalent focal length

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length, equivalent focal

In an optical system composed of more than one lens, it is the linear distance separating the principal focus from the corresponding principal point. It is usually the most important quantity in the specification of an optical system as in objectives, eyepieces, etc. See principal focus; equivalent power.

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power			Lens: A good quality telephoto lens with a focal length of 210mm or a zoom lens with an equivalent focal length is recommended. How to photograph hummingbirds by Mathes, George E.; Stouffer, Anita / PSA Journal 6x conversion factor inherent in the APS-C sized sensor, the high zoom ratio of this EF-S 55-250mm lens actually achieves the equivalent focal length of 88-400mm (in 35mm format). Canon U.S.A.'s New EOS Rebel XSi Places Superior Optics and ... by Business Wire 5in 230k LCD monitor, RAW mode shooting and a massive 18x Leica zoom lens with optical image stabilization and a 28-504mm equivalent focal length range. The Panasonic Lumix DMC-FZ18 Digital Camera Features and Information by Peter Sams / Electronics community			equin- equine equine antitoxin equine encephalitis equine gait equinovalgus equinovarus equinus equipment Equipoise equipotential equipotentiality Equiprobable Equisetum Equisetum Arvense equitation Equithesin equitoxic equity equity model equivalence equivalence trial equivalence zone equivalency equivalent equivalent focal length equivalent oxygen pressure equivalent weight equivocal symptom equol equulosis Equus Er ER bodies ER+ ER- ER/trauma setting Eradicate eradication erasion Erasistratus Eraxis Erb's disease Erb's dystrophy Erb's muscular dystrophy Erb's palsy Erb's point Erb's sign Erb-Duchenne paralysis Erb-Goldflam disease Erb-Westphal sign			Equivalent Continuous Noise Level Equivalent Continuous Sound Level Equivalent Continuous Sound Level Equivalent Current Dipole Equivalent Current Method Equivalent Degrees of Freedom Equivalent Designers Cost Analysis System equivalent diameter Equivalent Direct Radiation Equivalent Distillation Capacity Equivalent dose Equivalent dose Equivalent dose Equivalent dose Equivalent Double Layer equivalent duct diameter Equivalent Dwelling Unit Equivalent Effective Stratospheric Chlorine Equivalent electrical circuit Equivalent electrical circuit equivalent electrons equivalent elements equivalent embedment length equivalent equations equivalent evaporation Equivalent Fare Paid Equivalent Field Office Equivalent Fixed Barrier Speed Equivalent Flight Hours equivalent focal length equivalent footcandle Equivalent Forced Outage Rate equivalent four-wire system Equivalent Frame Method Equivalent Full Charge Equivalent Full Load Hours Equivalent Full Power Hours Equivalent Full Power Level Equivalent Full Time Equivalent Full Time Student Equivalent Full Time Student Load Equivalent Full Time Student Unit Equivalent Full-Time Employee Equivalent Full-Time Person/People/Placement Equivalent Generalized Impedance Boundary Condition equivalent given for injury equivalent given for loss sustained Equivalent Granular Thickness equivalent head wind equivalent height Equivalent Hertz Equivalent Hydraulic Diameter Equivalent Identification equivalent inequalities

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