How to Use Sigma on a TI-89?

Answer Sigma, the symbol Σ, is used to denote a summation in math. A summation adds a set of numbers together. The sigma is used on a TI-89 when calculating a summation. A TI-89 is a calculator developed... Read More »

Top Q&A For: How to Use Sigma on a TI-89

Will a Canon 50D work with a sigma 18-50mm and sigma 50-150mm hsm?

I have a Canon Ixus 400 and have been using a 1GB Integral memory card on it for years - works absolutely fine!

Will sigma 35mm lens fit the sigma digital camera?

Sigma builds lenses with mounts to fit Sigma and other cameras. I own two which are made to fit a Canon body. These would not work on a Sigma camera as they are, but I'm sure the lenses are also av... Read More »

Which is a better sigma 120-400 lens or sigma 150-500 len?

Nikon stopped producing the D80 in August 2008 as it was replaced by the D90 :)

What does APO stand for in Sigma lenses and how does it differ from normal sigma lenses?