Canon EF-S 18-200mm f/3.5-5.6 IS Zoom Lens

From time to time I become troubled by those airheads who ramble on and on quoting minute particulars about some esoteric specification of these lenses. In the real world. The point is convenience and how it shoots. This happens to be a really good lens that extends wide angle though the telephoto range. The image stabilization provides extra f stops. I always come away with great images. It's the solitary lens you need to carry for portraits, weddings and landscapes.

The lens is lightweight and compact with a broad focal range and it's the ideal focal length breadth for using as a day-in-and-day-out walk around street lens. Although shooting In poor light or in wider-angle scenes, it's not as crisp as the 17-55mm f/2.8 Canon lens, or when photographing macro-style images of flowers and butterflies, it isn't as crisp as the Canon 100mm f/2.8, and when shooting at its maximum 200mm length to frame distant turtles sitting on a log and far off birds, it isn't as crisp as the Canon 70-200mm f/4L.

If you need a low light lens, this isn't it. If your primary objective is to shoot images in available light situation such as weddings and concerts, then get the 24-70mm IS f/2.8L USM and the 70-200mm f/2.8 lenses instead.

However as a one-lens answer tor cover these kind of focal lengths, it's a pretty good lens. However as a single-lens answer to cover these sort of focal lengths, it's a pretty good lens. This superzoom lens focal length runs from wide to telephoto 35mm equivalent of 29-320mm. It also has the Optical Image Stabilizer allowing as many as 4-stops of effectual shake correction even while at full zoom. Since the Canon optical image stabilizer system is contained inside the lens, and not inside the camera, the steadier, stabilized images can actually be seen when looking through your viewfinder. Additionally the circular aperture will provide beautiful effective background blur. This EF-S broad zoom ratio lens provides exceptional high-speed operation while still keeping the price affordable. Zoom lock keeps the lens from extending accidently.

The diameter of the barrell is so large,that shadows appear in images that need flash. being the result of the flash located on an xsi body plus the focal length setting of the lens. This is easily fixed by using a hot-shoe flash.

  Nov 12, 2011

Superzoom
The term hyperzoom or superzoom is used to promote photographic zoom lenses with unconventionally large focal length factors, typically more than 4× and ranging up to 15×, e.g., 35 mm to 350 mm. The largest ratio for digital SLR cameras is held by the Tamron 18–270 mm, giving 15×. Some Digital Camera Review by Gene Wrights have even larger zoom ratios up to 35×. For movie and television use, Panavision holds the record with their 300X HD Lens.

While superzoom lenses have improved greatly in recent years, they still have a number of drawbacks in comparison with shorter-range zooms and prime lenses. Most notable is the much increased likelihood of significant distortions of the image at both extreme ends of the range. Other potential problems include smaller maximum aperture and poorer autofocus performance

Following is a list of superzoom lenses, used for 135 format in SLRs or for APS format in DSLRs. The minimal factor used here is 5× or more. A 28–200 mm has a 75° to 12.3° angle of view, a 28–300 mm (or an 18–200 mm for an APS DSLR) has an 11.1x 75° to 8.2°

• Zoom Wide Angle-Telephoto
• With Image Stabilizer
• Superior Image Quality
• Super Spectra Coatings