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As I said earlier in this review, the Sigma 17-50mm f/2.8 EX DC OS HSM Lens turns in very impressive center-of-the-frame performance.
Long multiplication means you're doing multiplication by hand. The traditional method, or Standard Algorithm, involves multiplying numbers and lining up results according to place value. These are the steps to do long multiplication by hand: Insert a decimal point in the product so it has the same number of decimal places equal to the total from step 1.Formula used to solve percentage problems that relates two ratios where one of the ratios is a part or portion per 100 and the other ratio is a part or portion per a whole. MFD testing uses manual focusing - and this lens indeed manually focuses closer than it will autofocus.
Calculator or tool that uses the percentage formula to solve for a desired value in that formula. The percentage formula contains three variables. If any two of the variables are known, the third variable can be calculated. Percentages can be used to make the relationship between a portion and a whole easier to understand. Copper has the unique advantage of oxidizing over time, which means that its color continues to evolve with the life of the sink. The older it gets, the more attractive it looks. Any scratches and flaws that occur on its surface will disappear into the metal as it oxidizes. The Sigma 17-50mm f/2.8 EX DC OS HSM Lens is available in Canon (reviewed), Nikon, Pentax, Sony/Minolta and Sigma mounts. Specific image content aside, I think that you will be able to discern a reasonable difference between the lenses in this example.
With a wide open f/2.8 aperture, the Sigma 17-50mm f/2.8 EX DC OS HSM Lens is impressively sharp in the center throughout the focal length range FTM (Full Time Manual) focusing is not featured in this HSM AF implementation - the focus ring turns during AF. Sigma 17-50mm f/2.8 EX DC OS HSM Lens consistently produces warmer image colors than the Canon 17-55.
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