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What extra features does a Canon Powershot A620 have?

Updated: 8/20/2019
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The Canon Powershot A620 has 20 shooting modes, a 7-megapixel CCD (which provides enough detail for printing 15 x 20 inch photos), a 2-inch display and 4x optical zoom, and a videocamera option that shoots high-quality movies at 60 frames per second.

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Q: What extra features does a Canon Powershot A620 have?
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Where can one find reviews for the Canon a620?

Sites from big electronic retailers may have a section where real-life customers who bought the cameras give reviews for it. Other sites like Ebay and Amazon will also likely to have reviews from customers.


How does iodine stain starch?

Starch is composed of polymers of glucose. Long linear chains are called amylose. Amylopectin is similar but contains a branch point about every 25th glucose or so.Amylose coils into a helical secondary structure resembling a tube with a hollow core. Certain molecules including fatty acids and iodine can lodge inside the core. The complex of iodine lodged inside the amylose tube produces a characteristic blue-black color. The starch itself is not altered, and the staining can be reversed.This is a very sensitive method, used industrially in the starch processing industry, to detect starch and starch fragments. Levels down to 10 ppm can be quantitated using a spectrophotometer to measure A620.However, Iodine is a "metachromatic" stain, meaning it is a single stain that can stain different things different colors. For example: Although Amylose in corn starch stains bluish (actually a sort of blue with a reddish-purple tent), Amylopectin type starches stain a completely different color, sort of a reddish-brown. Tapioca starches stain a more true blue color. Additionally, high amylose type starches stain a shade of pink (when viewed using a polarized microscope, with cross-polarizers in place). Therefore, it is a mistake to think that "all starches" stain a bluish color.Additionally, varying the concentration of the stain, relative to a given amount of starch, can vary the intensity of the staining result. Less stain produces a lighter shade of the expected color, and vice-versa. And the best Iodine stain is actually a blend of Iodine crystals and Potassium Iodide in water.CheapIodine.com is a great source for Iodine.