C11 Astrophoto w/ST4 Set Up Help

Ok, here is the deal. I have a C11 Ultima, an ST4 autoguider and a Firstscope 80 (f/11 I believe). If I use the 80 with the ST4 as a guidescope on the C11 at prime focus, will that combo provide the accuracy needed to produce nice round star images? Also, can anybody recommend what the settings should be on the ST4?

Thanks Chris