Description: Sony SAL18250 Alpha DT 18-250mm f/3.5-6.3 14x Zoom Lens
The Sony SAL DT 18-250mm f/3.5-6.3 Lens is a condensed, wide-angle through long-telephoto autofocus zoom made in China
especially designed for Sony Alpha and the Minolta Digital DSLR camera bodies. This long range zoom translates into a huge 14x zoom ratio. The lens is relatively compact, while the lens optics have been computer optimized for the smaller diameter APS-C image circle to function with an APS-C CCD image sensor used with DSLR camera bodies.
When mounted on a DSLR camera body, it acts like a 27-375mm lens on an SLR film camera, good for portraits,, snapshots, interiors and more - a great all-around travel lens.
Although optical and mechanical implementation is low, in all probability it's adequate enough for the limited casual use it most likely will receive from the actual buyer.
It's not built for serious application; it produces quite a lot of purple fringing (CA) and and loaded with other distortions such as being soft at the far end, although for family travel, who am I to stop you from getting a do-everything lens for your Sony DSLR.
Also it's somewhat heavy but you'll get accustomed to it. The barrel extends quite a lot when zooming and it appears a little despicable although it appears reasonable while retracted. Also it's not congruent with 35mm SLR or "full-frame" DSLR cameras.
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°
Aug 29, 2011. Typical internet price $579.
Announced Sep 5, 2007
Alternative Superzoom Lenses
Features
• DT lenses employ a new optical system that is specifically designed for APS-C
DSLR cameras
• ED (Extra-low Dispersion) glass to reduce chromatic aberration at telephoto
extension
• Internal Focusing system eliminates front lens rotation, allowing the use of a circular polarizing filter.
• 7-blade circular aperture for pleasing defocused effects.
Lens Includes
• Sony SAL-18250 DT 18-250mm f/3.5-6.3 Autofocus Lens
• Front & Rear Lens Caps
• ALC-SH104 Lens Hood for 18-250mm f/3.5-6.3 Lens
• 1-Year Warranty
