Is Canon EOS 20D Astrophotography and Sigma 18-200mm f/3,5-6,3 DC (motorized) compatible?

Below you will find your chosen camera and lens. Click on the product name for more information.

Canon EOS 20D Astrophotography

Canon EOS 20D Astrophotography
Released: 2005
Type: Digital SLR
Sensor: APS-C (1.6x)
8,2 Megapixels
3504 x 2336 pixels

Sigma 18-200mm f/3,5-6,3 DC (motorized)

Sigma 18-200mm f/3,5-6,3 DC (motorized)
Released: 2008
Superzoom
Suited for cameras with APS-C sensors
Focal Length: 18-200 mm
Aperture: f/3,5-6,3

Can you combine these two?

This is the short answer:

No! This combination is not compatible

The camera and lens you have chosen cannot be combined. Here is a longer answer:

A non-Canon lens on a Canon camera

Unfortunately this Sigma lens has not been made with a Canon mount, which is needed to let Canon camera owners use a Sigma lens with their cameras.