Hi guys!


Just want some advice & input regarding the MOST appropriate fisheye for my 40D (I have an Ef-S screen installed as well)... I'm gonna use it as my for my UWA purposes. Please see below choices:
  • Samyang 8mm 3.5
  • Vivitar Series 1 7mm 3.5
  • Sigma 10mm 2.8 EX DC HSM
  • Sigma 15mm 2.8 EX DG HSM
  • Canon 15mm 2.8



BTW, can you also explain the differences between rectilinear, diagonal, & circular? Aside from the above choices, can you suggest the Tokina 11-16mm 2.8?





Thanks for all your inputs & advices in advance!


Chris