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How to Do the Sigma Boy Challenge (Impossible Spam)
If you spend a lot of time browsing TikTok or YouTube, chances are, you'll have stumbled across a video titled Sigma Boy Challenge at some point, or some variation thereof. These videos typically show ...
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Sigma in Statistical Analysis: What You Need to Know
The meaning of Sigma in statistical analysis is a function of whether you use the upper or lower case of the letter. The uppercase use of sigma denotes a summation while the lowercase represents a ...
So I purchased one of the new Sigma 18-300mm F3.5-6.3 DC MACRO OS HSM Contemporary lenses for my Canon T1i and the USB dock to make adjustments/updates. There is some definite back focusing at middle ...
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