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Sigma are a Japanese company which produce cameras, lenses and flashes. They're most widely known for their selection of lenses which are compatible with cameras from other manufacturers.

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What are the significant differences between Tamron and Sigma 17-50mm f/2.8 lenses?

I am so close to buying one of these two lenses, both with image stabilization for my Nikon D7100. Can anyone help me decide by giving me any important differences or sharing any experience?
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High Speed Sync with Canon 7D and Sigma EF-610 DG Super

Does anyone know how or if high speed sync can be triggered using a Canon 7D and a Sigma EF-610 DG Super? After making all the settings as per the 610's manual, as soon as I meter/focus the camera ...
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How can I fire a Sigma 610dg Super with a TriggerTrap Flash Adapter?

I have a Sigma 610dg super flash that I wish to trigger with the TriggerTrap flash adapter (tt-fa1). Sadly I cannot make this work. I have tried two different TriggerTrap dongles but the flash never ...