iksose7

The Canon 2.8 is fantastic. It was my entry to astrophotgraphy although i have not used it in a couple years since buying my frac. 

I never got the full potential out of the lens as back then i didnt have guiding. I have also since added a TS microfocuser and aperture rings. The rings are great as you can use the lens wide open and not be plagued by horrible star spikes!

Callum 

This is setting a very high standard for amateur astrophotography, congrats to you both and good luck with getting someone to print the beast! Look forward to seeing Toms version.

Callum

Astrophotography with a lens is all i know as i havent quite saved enough for the scope i'm after yet. I use the great Canon EF200L 2.8 II. Many will back up what an excellent bit of glass this is although i am yet to realise its full potential, but i have just purchased a guiding setup which will help tremendously.

Heres a few images taken with the lens and DSLR:

And a couple with another great lens, the Canon 50mm 1.8

And to put Ollys awesome image of Orion into perspective, heres what an hours exposure with the 50mm will get you. I also used my images of the B33 and M42 for detail in this image.

Check out the link in my signature if you want to see more, they are all taken with DSLR and lens.

You sir, are dedicated! Well done on a fantastic bit of work just when i was starting to think M31 images were getting boooring, but now i would love to do something similar someday. Love that second image of those blue star clouds!