There are 3 options; for canon lens, nikon or sigma lenses. So if I have the sigma zoom lens but the camera body is canon, which dock do I need?

The Canon Dock if you have a Canon camera. Check that the Dock will work with the Sigma lens you have. If its the 150 - 600 Contemporary or Sport you have it will work.

Why do I need to update the firmware on a new lens

In truth you may never need to do this BUT if you change your camera body or want to modify the OS button effect on the lens then this will let you do it. NB it only works with certain Sigma lenses (C and S, and probably A, versions only I think). Not expensive but probably an item a camera club should have in their kit.

wich sigma usb dock i should buy for a sigma lens canon fit?

https://www.amazon.com/Sigma-USB-Dock-for-Canon/dp/B00CBQ5YOS

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🔧 Upgrade your lens game — because your vision deserves precision.

STAY FUTURE READY - Update your Sigma Global Vision lenses with the latest firmware to keep your gear cutting-edge.
COMPACT LIGHTWEIGHT - Sleek design at just 65 grams fits effortlessly into your professional kit without bulk.
PINPOINT FOCUS CONTROL - Customize autofocus speed and limiter distances for razor-sharp shots tailored to your Canon setup.
SEAMLESS COMPATIBILITY - Works flawlessly with both Windows and Mac via the free Sigma Optimization Pro software.
EFFORTLESS LENS MANAGEMENT - Optimize and personalize your lens performance with intuitive software—no tech expertise needed.

The SigmaUSB Dock Canon is a compact, lightweight device designed for Sigma Global Vision lenses, enabling firmware updates and precise autofocus customization via free cross-platform software. Tailored for Canon EF mount lenses, it empowers professional photographers to maintain peak lens performance and adapt to evolving shooting demands.

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Package Dimensions L x W x H	11.8 x 9.5 x 5.4 centimetres
Package Weight	0.18 Kilograms
Product Dimensions L x W x H	6.9 x 6.9 x 2.5 centimetres
Item Weight	65 Grams
Brand	Sigma
Colour	Black
Has image stabilisation	No
Included components	Box contents: USB dock
Model year	2013
Plug profile	Canon EF
Part number	878954
Size	‎10.2 x 5.1 x 5.1 centimetres
Zoom Type	Digitalzoom
Lens Design	Prime
Maximum Aperture Range	f/2.8 - 4
Focus type	Auto Focus
Style	Canon Lenses
Guaranteed software updates until	unknown

SigmaUSB Dock Canon

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