Originally posted by BBear I understand the 1.5x crop wont eliminate the distortion completely, but because we WANT the distortion and technically I think fisheyes have 180degree, hence the question.
There are two different kinds of fisheye lenses:
- 180 degree diagonal
- Circular
The 180 degree diagonal provides 180 degrees along the diagonal axis of the picture frame. The circular provides 180 degrees in all directions, but projects a circular image. Both can be used with a cropped sensor with some loss of FOV. Both have significant distortion, even on a cropped sensor. Most fisheye lenses are 180 degree diagonal in order to fill the frame.
So, the question comes...Why is it that some pictures taken with fisheye lenses don't look the least fishy? The answer is two-fold:
- If the lens axis is level to the earth, the horizon will look flat
- In that absence of straight lines, the eye tends to ignore distortion
I have the Zenitar 16/2.8 Fisheye. On 35mm film, there is no denying its fishiness. On APC-C, it all depends how I hold the camera and/or compose the shot. Consider these (all with the Zenitar):
Fishy...
Fairly fishy...
Not so fishy...
Also not so fishy...
Steve
(bought the Zenitar for general landscape use...would really prefer a nice 16mm or 18mm rectilinear for the same amount of money...)