
	Where results make sense

Topic: Zoom lens

Related Topics

Lens (optics)

Telephoto lens

Photographic lens

Wide angle lens

Focal length

Normal lens

Prime lens

Microscope

Telescope

35mm film

Optics

Hubble Space Telescope

Northern England referendums, 2004

Father of Confederation

Relative density

In the News (Sat 28 Nov 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Shutterbug: Sigma’s 120-300mm f/2.8 APO HSM Zoom Lens
		It’s the 120-300mm f/2.8 APO HSM zoom from Sigma, and it is the first pro-quality zoom lens with both a 300mm top end and a fast fixed f/2.8 aperture.
		How they manage to build this complicated lens (it has 18 elements in 16 groups!) and keep it this hand holdable is beyond me. The finish is Sigma’s slick satin fl finish, and the huge knurled rubber focus and zoom rings are a nice touch.
		Autofocus was brilliant—the lens banged into focus when pointed in any direction—and focus speeds seemed very consistent with what I had been experiencing with my good older 300mm f/2.8 L lens.
	shutterbug.com /equipmentreviews/lenses/0204sb_sigma (1491 words)

	Zoom lens - Wikipedia, the free encyclopedia
		Early forms of zoom lenses were used in optical telescopes to provide continuous variation of the magnification of the image, and this was first reported in the proceedings of the Royal Society in 1834.
		This compensation may be done by mechanical means (moving the complete lens assembly as the magnification of the lens changes), or optically (arranging the position focal plane to vary as little as possible as the lens is zoomed).
		An important issue in zoom lens design is the correction of optical aberrations (such as chromatic aberration, and in particular, field curvature) across the whole operating range of the lens; this is considerably harder in a zoom lens than a fixed lens, which need only correct the aberrations for one focal length.
	en.wikipedia.org /wiki/Zoom_lens (1080 words)

	10. Lenses
		Since a short lens includes a wide sweep of the scene, all of the objects in the scene are reduced to fit onto the image sensor.
		When the focal length of a lens is close to the diagonal measurement of the film format, the lens is said to be "normal" or close to the magnification of the human eye.
		A digital zoom lens uses sleight of hand by taking a part of the normal image falling on the sensor and then saving that part as is, or enlarging it to fill the sensor.
	www.shortcourses.com /choosing/lenses/10.htm (2962 words)

	Zoom Lens Tricks (Site not responding. Last check: 2007-10-21)
		If a zoom lens can be extended out of it's mount with an extension tube, unscrewed and/or held with matte box rods the lens will now focus closer than minimum focus as you zoom wider.
		Calculate the lens extension exposure increase for the maximum focal length of the lens which is usually negligible.
		Zoom lenses can be extended at a loss of sharpness and F-stop.
	www.rondexter.com /professional/effects/zoom_lens_tricks.htm (782 words)

	The Canon 16x Manual Servo Zoom Lens for the XL1 / XL1S by Ken Tanaka
		The lens’ zoom servo is engaged and disengaged by a switch located on the lower right side of the lens barrel.
		The 16x Manual Servo lens’ variable-speed servo is capable of producing a good, slow creeping zoom although it is not quite as slow as the superb crawl of the 16x IS II lens.
		While the lens’ true manual focus feature may make it attractive to those frustrated with the 16x IS II lens’ auto-focus and servo-manual focus facility, continuous manual focus takes a great deal of concentration and effort on the part of a camera operator particularly where subject motion is involved.
	www.dvinfo.net /canon/articles/article82.php (1425 words)

	Zoom - Wikipedia, the free encyclopedia
		The word zoom is an example of onomatopoeia that indicates swiftness.
		Zoom lens and digital zoom, in photography and computer programs
		Zoom (comics), one of the Reverse-Flashes, enemies of the Flash in the DC universe
	en.wikipedia.org /wiki/Zoom (135 words)

	Tamron AF 18-200 mm F3.5 - F6.3 Di-II: Digital Photography Review
		In addition, three hybrid aspherical lens elements and two LD (Low Dispersion) glass elements are used to accomplish effective compensation of on-axis and lateral chromatic aberrations, a critical factor to enhance the optical quality in digital photography.
		The zoom lens uses a new optical system designed to confine the changing angles of incidences of light rays reaching the imager within a certain scope over the entire image field from the center to the periphery, by considering the effects of variances due to zooming.
		The lens is a multi-purpose zoom lens, yet excellent portability and ease of use are assured.
	www.dpreview.com /news/0502/05022105tamron_18-200mm.asp (1141 words)

	NEWS! - Sigma: new macro zoom lens
		The new lens design and multi layer lens coating reduce flare and ghosting, which is a common problem with digital cameras.
		This lens offers a large aperture of F2.8 at 17mm wide angle and yet it is compact, with an overall length of 79mm (3.1”) and diameter 82.5mm (3.2”).
		The lens design incorporates an inner focusing system, which ensures fast AF speed as well as prevents the front of the lens rotating, making it particularly suitable for use with circular polarizing filters and petal shaped lens hoods.
	www.imaging-resource.com /NEWS/1137599245.html (488 words)

	Tele-Zoom Lens targets digital SLR cameras., Tamron USA Inc.
		For photographers who bought their digital SLR camera in a kit with a standard zoom lens but are dissatisfied with the telephoto capability of the standard lens, the new AF55-200mm F/4-5.6 Di II LD MACRO offers in a second lens a desirable telephoto range at an affordable price.
		This is a telephoto zoom for exclusive use on digital SLR cameras that covers the focal length range equivalent to 85-310mm when converted to a 35mm format.
		The zoom lens uses a new optical system designed to confine the changing angles of incidences of light rays reaching the imager within a certain scope over the entire image field by considering the effects of variances due to zooming.
	news.thomasnet.com /fullstory/468264/rss (1361 words)

	Zoom CCTV Lens goes from wide angle to telephoto., Tamron USA Inc.
		This new lens from Tamron, the pioneer of the Vari-Focal lens, redefines the standard for the CCTV industry.
		Adding to the versatility and performance of the lens are convenient locking mechanisms that ensure stability of distance (zoom lock), brightness (iris lock) and picture sharpness (focus lock).
		The lens is well suited for use in applications where wind or vibration is a factor in selecting equipment to install.
	news.thomasnet.com /fullstory/8638/1899 (982 words)

	18-70mm AF-S DX Lens Review by Thom Hogan
		Having a kit lens for consumer camera isn't new for Nikon, but a closer look at the specs showed this was an AF-S lens, an ED lens, and a DX lens.
		The advantage of a DX lens is that it can be smaller and lighter than a lens of similar specifications that needs to cover the full 35mm frame.
		The zoom ring is quite stiff and not at all fluid (as I've used my lens and moved it in and out of dry environments, it has a bit of a "catch" in the middle of the zoom range).
	www.bythom.com /1870lens.htm (2187 words)

	PhotoNotes.org Dictionary - Zoom lens
		A lens with a variable focal length is a true optical zoom.
		It’s much more complicated to build a zoom lens, and so high-quality zooms tend to be very expensive and low-quality zooms tend to offer poor optical quality.
		Zoom lenses also have either fixed maximum apertures (constant aperture) or they have maximum apertures which vary according to the current focal length setting (variable aperture).
	photonotes.org /cgi-bin/entry.pl?id=Zoomlens (372 words)

	Virtual Mirror - content Zoom Lens
		A common application of a lens is to create a callout in which a portion of a drawing can be seen in greater detail superimposed upon, or off to the side of, the drawing.
		Zoom Lens also allows you to apply special effects to what is visible behind a lens through Illustrator's Live Effects feature.
		Zoom lenses are live on Illustrator's artboard: as you move or edit the objects lying underneath the lens, the lens is updated to reflect the change.
	www.virtualmirror.com /html/VS2content_ZoomLens.html (446 words)

	Miniature Zoom Lens Available
		The high-performance 6 -18 mm f/2.8 zoom lens are designed for use with single chip 1/2" and 1/3" CCTV cameras in a variety of applications including Broadcast TV - Industrial Inspection Systems - Unmanned Vehicles - Industrial Control Systems - Robotics - Scientific Analysis and Surveillance systems.
		A feature of type 207 miniature zoom lenses is that they can focus down onto objects that are very close to the lens.
		The use of the lens at such close object distances opens the door to a range of macro applications because it allows an object to be shown at a very enlarged size on a TV monitor.
	www.photonicsonline.com /nl/209357/1427417 (230 words)

	18-55mm AF-S DX Lens Review by Thom Hogan
		Having a kit lens for consumer camera isn't new for Nikon, but the specs say this an AF-S lens, an ED lens, and a DX lens, which seems to imply something designed to a higher level of quality.
		This is a two ring design; the zoom ring is a big frontmost ring, while the focusing ring is barely a quarter inch wide and at the very front of the lens.
		Again, since this is a DX lens, that's not likely, though in a pinch it can suffice as a 24-55mm lens on those bodies.
	www.bythom.com /1855lens.htm (1986 words)

	Robotics Institute: Zoom Lens Calibration
		In variable parameter lenses the image formation process is a dynamic function of the lens control parameters, and thus the terms in the camera model must also be variable.
		Second, the relationship between the lens' physical configuration and the control parameters is complex and typically unknown.
		The models operate across continuous ranges of focus and zoom with an average error of less than 0.14 pixels between the predicted and the measured positions of features in the image plane.
	www.ri.cmu.edu /projects/project_370.html (629 words)

	Nikon AF-S DX 18-200mm f/3.5-5.6G VR IF-ED Zoom Image Samples (Site not responding. Last check: 2007-10-21)
		The new Nikkor lens offers a remarkable 18-200mm focal length range, conveniently covering everything from wide landscapes to tight portrait shots (equivalent to a 27-300mm lens in 35mm format), and advanced Nikon engineering has given rise to a compact lightweight design that offers excellent handling characteristics.
		The highlight of this versatile powerful zoom lens is the benefit of improved Vibration Reduction (VR II), an innovation that makes it possible to take substantially sharper handheld pictures at slower shutter speeds.
		This lens is designed exclusively for use with Nikon digital SLR cameras and is not compatible with 35mm [135] or IX240 format film cameras.
	www.digitalreview.ca /cams/Nikkor_18200VR.shtml (1020 words)

	Zoom lens 24 mm - Compare Prices & Reviews at Smarter
		Canon offers this ultra-wide zoom lens with portrait-length telephoto capability.
		By having multiple lens groups move during zooming, the lens was made compact and lightweight.
		High contrast is maintained at all focal lengths and sharp images are obtained.
	www.smarter.com /photography-6/product/zoom_lens_24_mm-9157 (119 words)

	Canon Zoom Lens Reviews
		Canon EF 24-105mm f/4 L IS USM Lens
		Canon EF 28-300mm f/3.5-5.6 L IS USM Lens
		Canon EF 70-200mm f/4.0 L IS USM Lens
	www.the-digital-picture.com /Reviews/Canon-Zoom-Lens-Reviews.aspx (620 words)

	zoom lens - Canon Digital Photography Forums
		The built in zoom capabilities continue to work with the adapters, but it is not the same as a zoom lens on a film camera.
		The built in lens is a 7-21mm lens.
		The 35mm equivalent of the G1's lens is 35-105mm.
	photography-on-the.net /forum/showthread.php?t=2122 (607 words)

	Lens Specs: 11-22mm f2.8/3.5
		The superb optics are designed specifically for digital photography - delivering the highest image quality - with their design highlighted by two aspherical glass lens elements that help prevent aberrations and distortions.
		These elements combine with new multi-coating on the first two lenses, which contributes to the removal of ghost or glare that can occur with a wide-angle lens, so clarity of images is obtained at all distances.
		Floating focusing system results in close focusing distance of 0.28m (11.02 inches) for close-up macro shots.
	www.olympusamerica.com /e1/sys_lens_ez1122mm.asp (130 words)

	Canon EF 100-400mm f/4.5-5.6L IS zoom lens or 400mm f/5.6L lens? (Site not responding. Last check: 2007-10-21)
		Canon EF 100-400mm f/4.5-5.6L IS zoom lens or 400mm f/5.6L lens?
		Which is a better lens, the Canon EF 100-400mm f/4.5-5.6L IS zoom lens, or the 400mm f/5.6L lens?
		If yes, then the straight 400 is clearly the lens for you.
	www.birdsasart.com /faq_1-4isor4f56.html (172 words)

	Nikon DX VR 18-200 mm F3.5-5.6G Zoom: Digital Photography Review
		Equipped with the new lens, users can take pictures at shutter speeds up to four times slower than is possible with a non-VR lens.
		The combination of the VR II technology, the 11x zoom feature and the focal length range – equivalent to a 27mm-300mm lens in 35mm format – means the AF-S DX VR Zoom-Nikkor is an ideal total package for dedicated amateurs and professionals alike.
		In addition, the new lens has a minimum focus distance of 0.5m applicable to the entire zoom range.
	www.dpreview.com /news/0511/05110103nikon18-200vr.asp (590 words)

	eBay - zoom lens, Lenses Filters, Film Cameras items on eBay.com (Site not responding. Last check: 2007-10-21)
		Tamron 75-300mm AF Zoom Lens for Canon EOS Rebel XT SLR
		Canon EF 35-80mm Autofocus Zoom lens for ALL EOS SLRs
		Canon EF 28-105mm Autofocus Zoom lens for ALL EOS SLRs
	search-desc.ebay.com /search/search.dll?query=zoom+lens&newu=1&krd=1 (619 words)

	261051 Olympus Zuiko 14mm - 45mm f/3.5-5.6 EZ Digital Zoom Lens for the E Digital SLR System.
		This ultra, compact, lightweight 3.2x standard zoom lens covers the zoom range most frequently used in normal photography.
		The combination of an ultra-high-refraction glass lens element with a low-dispersion glass lens element ensures excellent image quality with superior resolution and contrast by effectively eliminating chromatic aberration in the medium-angle range.
		The use of dual aspherical lens elements significantly reduces distortion, spherical aberration and coma aberration.
	www.adorama.com /IOM1445.html (553 words)

	Amazon.com: Canon EF 75-300mm f/4-5.6 III Telephoto Zoom Lens for Canon SLR Cameras: Camera & Photo (Site not responding. Last check: 2007-10-21)
		The most affordable of Canon’s long telephoto zooms, this lens is excellent for subjects from portraits to wildlife and nature.
		Anyway, I'd recommend you to buy the lens of the same focal distance but in another configuration: Canon EF 75-300 F/4.5-5.6 IS USM.
		Practically speaking, you will be able to increase your zoom reach to the point where you can A) photograph birds in moderately distant trees, B) be able to zoom in on the other side of a valley and frame something of your interest.
	www.amazon.com /Canon-75-300mm-4-5-6-Telephoto-Cameras/dp/B00004THD0 (1103 words)

	The Nikkor 80-400mm f/4.5-5.6D ED VR zoom lens (1) Nikonians Review
		In the Nikkor lenses forum of this community someone asked what were our opinions on the recently announced but yet expected on the shelves Nikkor 80-400mm AF VR zoom lens.
		"The temptation of a do-it-all zoom lens is high.
		P.S. Converters work great on the 80-200mm AF-S, although they are seldom recommended for zoom lenses.
	www.nikonians.org /html/resources/nikon_articles/nikkor/af/80-400 (356 words)

	Zoom Lenses - Zoom Lens Manufacturers, Zoom Lens Factories, Zoom Lens Suppliers, China Zoom Lenses
		Zoom Lenses - Zoom Lens Manufacturers, Zoom Lens Factories, Zoom Lens Suppliers, China Zoom Lenses
		"Alibaba Zoom Lens" connects you directly to prequalified Zoom Lens manufacturers and exporters from China and around the world.
		If you are a supplier, factory, manufacturing company or exporter, and want to have more international Buyers, Join Alibaba now to become a Gold Supplier (for Chinese suppliers), or a TrustPass® Member (for suppliers outside mainland China), and have the opportunity to be included here in the featured supplier list!
	hotproducts.alibaba.com /manufacturers-exporters/Zoom_Lens.html (253 words)

Try your search on: Qwika (all wikis)