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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Sigma USB Dock Canon

Product ID: 48040880

Details

Brand
Sigma
Colour
Black
Compatible devices
Sigma 35mm DG
Hardware interface
USB
Item weight
65 Grams
Number of items
1

🎯Precision focus adjustment for perfect shots

🔄Firmware updates keep lenses future-proof

⚙️Customizable AF speed & focus limiter on Sport lenses

Description

🎥 Upgrade your lens IQ — because your shots deserve the sharpest edge!

SEAMLESS COMPATIBILITY - Works exclusively with Sigma’s Global Vision Art, Sport, and Contemporary lenses for optimized control.
PINPOINT FOCUS ACCURACY - Fine-tune focus across zoom and focal ranges for razor-sharp images every time.
FREE PRO SOFTWARE INCLUDED - Download Sigma Optimization Pro for Windows and Mac to unlock full customization potential.
STAY AHEAD WITH FIRMWARE UPDATES - Never let your lens fall behind—update firmware effortlessly via USB.
TAILORED PERFORMANCE FOR SPORT LENSES - Adjust autofocus speed, optical stabilization, and focus limiter to match your shooting style.

The Sigma USB Dock Canon is a compact, USB-powered device designed for photographers using Sigma’s Global Vision lenses. It enables firmware updates and precise customization of autofocus and focus limiter settings via Sigma Optimization Pro software, ensuring lenses stay current and perfectly tuned for professional-grade performance.

Specifications

ASIN	B00CBQ5YOS
Best Sellers Rank	1 in Camera Wide-Angle Converters 225 in Camera Lenses
Box Contents	Box contents: USB dock
Brand Name	Sigma
Colour	Black
Compatible Devices	Sigma 35mm F1.4 DG HSM, 17-70mm F2.8-4 DC MACRO OS HSM / 120-300mm F2.8
Country of Origin	China
Customer Reviews	4.6 4.6 out of 5 stars (2,776)
Global Trade Identification Number	00085126878542
Hardware Interface	USB
Item Dimensions L x W x H	10.2L x 5.1W x 5.1H centimetres
Item Weight	65 Grams
Manufacturer	Sigma
Manufacturer Part Number	878954
Model Number	878954
Number of Items	1
Number of Ports	1
Total USB Ports	1
UPC	085126878542
Unit Count	1.0 count
Wattage	2.5 watts

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