I have a nikon d80.

looking to go with either the 10mm or 15mm sigma fisheye.

Which one will i NOT have to crop due to vignetting?
I cant remember why that happens...something with the sensor or whatnot? i want to buy the lens that doesnt require me to crop all the photos.

i know ive been told the 8mm is way too small and it would be problematic for my camera.

 

nevermind , it appears i got my answer.
the question i was asking was in relation to my sensor. it turns out the 10.5 will be a perfect lens for this sensor/camera.