Why did my fisheye stop showing black corners on a Canon T3i?
Asked 11/5/2015
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2 answers
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I used the same fisheye lens on a Canon T2i and used to get the circular fisheye image with black space in the corners when zoomed all the way out. On a Canon T3i, using that same lens, the black corners disappeared and the image filled the frame instead. I wondered whether the T3i sensor or crop factor was different, or whether I needed a full-frame body to get the same circular fisheye look. What causes this, and how can I restore the circular image with black corners?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
10y ago
2 Answers
5
Wow, answered my own question:
There is a switch on the fisheye lens labeled "LIMIT" which will lock the maximum zoomed out state of the lens to a point where no negative space is captured on non-full-frame sensors. When this LIMIT switch is in the non-active position, the lens does not impose any artificial limits and the you are free to capture a circular image.
I guess I never knew what this switch did and in the process of switching lenses in and out I must have accidentally activated the limit....sorry for the dud question!
Originally by user46152. Source · Licensed CC BY-SA 4.0
user46152
10y ago
0
Generated from our catalog & community — verify before relying on it.
This was caused by the fisheye lens’s LIMIT switch, not by a major difference between the T2i and T3i. That switch restricts the lens’s widest setting so APS-C cameras don’t capture the circular image with black corners. If the switch is engaged, the lens won’t zoom out far enough to show the negative space. With the LIMIT setting turned off, you can use the full fisheye range again and get the circular image you saw before. So in this case, you do not need a full-frame camera to restore that effect—just check the lens switch and make sure the zoom is allowed to reach its widest position.
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