Author: keith

Tech Tip of the Day: Recovering Lost files on Windows.

Tech Tip of the Day. I helped my neighbours today, B had lost a file on her High School Laptop. Apparently they use the Cloud at High School now. Microsoft Cloud…….. I went back to the old ways, I opened a command prompt, I was in B’s home folder (/Users/studentid,http://en.wikipedia.org/wiki/Home_directory). I then ran the command “dir file_prefix* /s /b” where file_prefix was the first word in her lost file name, the * (star or asterix, obelisk is another guy) is the wildcard character. In plain english this means anything starting with the word file_prefix, e.g. “find any file starting with important_assignment”. Several files were found then the modified date (I was looking for the most recent date, ideally today) was reviewed and voila, we found the “lost” file. I copied this file from its location to her Sky Drive or whatever its called and B was back on track. I suggest you bookmark, save, store this information for a rainy...

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Example – Depth of Field and Focal Length

Depth of field is greatly influenced by the focal length, using a long lens, 300mm for example, means that F5.6 is like F4.0. This photo shows this in action, the nice blurred background here is also aided by a good deal of depth in the subject as well, position yourself where you can get great depth in the photo. The depth will great enhance the depth if field.  ...

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International System of Units (SI) prefixes.

I always find it hard to picture these BIG numbers in my head, so here they are in simple form with comma’s between the 0’s to give them a little length. yocto — 10^-24 — 0.000,000,000,000,000,000,000,001 zepto — 10^-21 — 0.000,000,000,000,000,000,001 atto — 10^-18 — 0.000,000,000,000,000,001 femto — 10^-15 — 0.000,000,000,000,001 pico — 10^-12 — 0.000,000,000,001 nano — 10^-9 — 0.000,000,001 micro — 10^-6 — 0.000,001 milli — 10^-3 — 0.001 units — 10^0 — 1.0 kilo — 10^3 — 1,000 mega — 10^6 — 1,000,000 giga — 10^9 — 1,000,000,000 tera — 10^12 — 1,000,000,000,000 (1 mega x 1 mega) exa — 10^15 — 1,000,000,000,000,000 peta — 10^18 — 1,000,000,000,000,000,000 (1 giga x 1 giga) zetta — 10^21 — 1,000,000,000,000,000,000,000 yotta — 10^24 — 1,000,000,000,000,000,000,000,000 (1 tera x 1...

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