Looking for a Canon 300mm lens

[soft urchin]

I want to do astrophotography with my Canon EOS 450D.
The camera came with a 18-55mm kit lens and because I currently have a tracking mount this lens wasn't enough. I have searching for second hand 300mm zoom lens.

After a bit of searching I have found these lenses:

• Sigma Autofocus 100-300mm f/4.5-6.7 DL (50€)

• Tamron AF 70-300mm f/4-5.6 LD. It comes with a UV - IR filter (70 €)

So my question is: Are these suitable lenses for starting astrophotography, and will they work on a Canon 450D?

[wind anchor]

idk abt those lenses but i have a canon 55-250mm. it is the sharpest efs lens for £200

if you HAVE to get a zoom lens i recommend above

if not neeeding zoom lens check out the 135mm f/2 lenses

[deft bane]

wrong camera thread, you’ll need adapters

[runic patrol]

Huh

[deft bane]

450d is EF thread. This AF

[runic patrol]

Ohhhhhhh i see now

Thats what you meant by thread

[deft bane]

yes