Sigma lenses are a bit different in the way they print the aperture on it, if they use the fraction "F". For example : F2.8 (there is no “ / “ after the F).
The usual compatible camera brands with Sigma lenses are:
Sigma lens acronyms for the quality and purpose.
The Main acronyms and abbreviations used by Sigma lens.
You might also be interested with the last entry in the blog:
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