View Single Post
Old Nov 2, 2008, 8:20 AM   #5
TCav
Senior Member
 
TCav's Avatar
 
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,633
Default

The Sigma 8mm F3.5 EX DG Circular Fisheye produces a circular image about 24mm in diameter (for a 35mm film camera and a full frame dSLR.) The smaller image sensor in your A100 will crop off the top and bottom of the image circle.

The Sigma 4.5mm F2.8 EX DC Circular Fisheye HSM produces a circular image on an APS-C image sensor.

The Sigma 15mm F2.8 EX DG DIAGONAL Fisheye produces a 180° angle of view from corner to opposite corner on a 35mm film camera and a full frame dSLR. On your A100, you would get a reducedangle of view.

The Sigma 10mm F2.8 EX DC Fisheye HSM produces a 180° angle of view from corner to opposite corner on an APS-C image sensor.
TCav is offline   Reply With Quote