[icefireman]

Hi every Ching,

Before having 5D2, I had a Canon 400D which I had no problem to hook up Sigma 18-200mm f3.5-6.3 DC OS HSM. However, when I hooked it up to 5D2, the photo happened a circle shape in 5D2. So what's the problem? When I hooked up Canon 50mm 1.8, it was normal. Please explain it!! Thanks all!!!

[ck_112]

因為 sigma 18-200 係 for apsc 機種既.
5D2 係 FF機. 故會有成像圈既出現.

[icefireman]

oic. Thank you!!