Answers.Body: <p>Yi Technologies action cameras have <a href="http://www.yitechnology.com/yi-4k-plus-action-camera-specs" rel="nofollow noreferrer">lens distortion correction as a built-in feature</a>. The lens does introduce distortion but the onboard processor compensates for it. </p>
  
  <p>I assume we'll see more of this type of compensation embedded in cameras in the future.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-06-06T19:57:54.050Z
Answers.Text: It is embedded in my Garmin Virb Ultra 30, but not in 4K mode.
Answers.UserDisplayName: Dmitri Nesteruk
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-06-30T18:55:56.387Z
Answers.Text: Embedded correction is much much worse than normal lens... You can not fully remove all distortions, sadly.
Answers.UserDisplayName: Prizoff
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-06-06T18:41:17.807Z
Answers.LastActivityDate: 2017-06-07T04:57:25.840Z
Answers.LastEditDate: 2017-06-07T04:57:25.840Z
Answers.UserDisplayName: Mark Conway
Answers.Body: <p>There are some of them:</p>
  
  <p>1) <a href="http://cnfpv.com/portal.php?mod=view&amp;aid=89" rel="nofollow noreferrer">Hawkeye Firefly 8S/8SE</a></p>
  
  <p>As from the official web site:</p>
  
  <blockquote>
    <p>The camera comes with two lens option 170 and 90 degrees lens: </p>
    
    <ul>
    <li>170 degrees wide angle lens for action sports and</li>
    <li>90 degree with linear lens for trips with your family.</li>
    </ul>
  </blockquote>
  
  <p>I think the last variant should do the job.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-06-30T20:14:24.137Z
Answers.LastActivityDate: 2018-06-30T20:14:24.137Z
Answers.UserDisplayName: Prizoff
Answers.Body: <p>There are two major advantages to recording fisheye distortion rather than rectilinear distortion.  First, it is optically easier to do, which means one can make lenses that are better in other metrics (such as chromatic aberration, resolution, vignetting, etc) while remaining small enough and light enough to fit into the body of an action camera.  Second, the relative size of an object doesn't change radically as its moves from center to edge when the camera is not under tight control.  For that reason, it is possible to define a crop area that follows the subject as it bounces around the full frame and then use motion tracking to create a relatively stable view of the object, which can then be de-fished.  If it were rectilinear, the stabilization process might have to do some major zoom and tilt corrections as well, which would be very distracting.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-06-30T18:54:35.067Z
Answers.Text: This doesn't answer the initial question... Are there any such cameras available?
Answers.UserDisplayName: Prizoff
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-07-04T15:48:36.783Z
Answers.Text: Given that the OP gave me a "this answers my question" green check-mark, I take it that my restatement-and-answer was more valuable than a simple "no" or a "yes" will the many caveats explained in other answers/comments.
Answers.UserDisplayName: Michael Tiemann
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2016-09-24T15:40:09.813Z
Answers.LastActivityDate: 2016-09-24T15:40:09.813Z
Answers.UserDisplayName: Michael Tiemann
Body: <p>I was looking at alternatives to the GoPro (such as the Sony FDR-X1000V), but they all seem to only shoot wide-angle with significant perspective distortion (fisheye). Are there action cameras which do <em>not</em> introduce this sort of distortion?</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-09-24T11:28:01.040Z
Comments.Text: I think the reason is that with a wider lens camera shake is much less perceptible and annoying. Given what action cams are used for this makes a lot of sense. With a longer lens you'd need some sort of stabiliser to make the footage watchable if you've got it strapped on to your helmet while you're white water rafting or mountain biking.
Comments.UserDisplayName: stib
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-09-26T10:05:56.290Z
Comments.Text: @stib well gimbals exist already, they do a good enough job
Comments.UserDisplayName: Dmitri Nesteruk
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-09-26T12:14:19.577Z
Comments.Text: Yes, but they're a whole 'nother level of complication and cost compared to a cheap plastic lens. I wouldn't put my gimbal on my mountain bike (not the way I ride) it would be a tangled mess of carbon fibre and wire in no time.
Comments.UserDisplayName: stib
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-09-28T08:25:07.570Z
Comments.Text: @stib gimbals are a proven tech in drones. I don't think they cost that much. their problem is they seem to get confused by bike tilts, that's a problem.
Comments.UserDisplayName: Dmitri Nesteruk
Tags: <video><action-cam>
Title: Is there a 4K action camera solution that does NOT have perspective distortion?
UserDisplayName: Dmitri Nesteruk
ThreadText: # Is there a 4K action camera solution that does NOT have perspective distortion?
  
  (Asked by: username_0 on 2016-09-24)
  
  I was looking at alternatives to the GoPro (such as the Sony FDR-X1000V), but they all seem to only shoot wide-angle with significant perspective distortion (fisheye). Are there action cameras which do *not* introduce this sort of distortion?
  
  **Tags:** video, action-cam
  
  > **Comments:**
  > **username_1**: I think the reason is that with a wider lens camera shake is much less perceptible and annoying. Given what action cams are used for this makes a lot of sense. With a longer lens you'd need some sort of stabiliser to make the footage watchable if you've got it strapped on to your helmet while you're white water rafting or mountain biking.  
  > **username_0**: @username_1 well gimbals exist already, they do a good enough job  
  > **username_1**: Yes, but they're a whole 'nother level of complication and cost compared to a cheap plastic lens. I wouldn't put my gimbal on my mountain bike (not the way I ride) it would be a tangled mess of carbon fibre and wire in no time.  
  > **username_0**: @username_1 gimbals are a proven tech in drones. I don't think they cost that much. their problem is they seem to get confused by bike tilts, that's a problem.  
  
  ---
  
  ## 3 answers
  
  ### Answer by username_4 on 2016-09-24. Score: 5 | Accepted answer
  
  There are two major advantages to recording fisheye distortion rather than rectilinear distortion. First, it is optically easier to do, which means one can make lenses that are better in other metrics (such as chromatic aberration, resolution, vignetting, etc) while remaining small enough and light enough to fit into the body of an action camera. Second, the relative size of an object doesn't change radically as its moves from center to edge when the camera is not under tight control. For that reason, it is possible to define a crop area that follows the subject as it bounces around the full frame and then use motion tracking to create a relatively stable view of the object, which can then be de-fished. If it were rectilinear, the stabilization process might have to do some major zoom and tilt corrections as well, which would be very distracting.
  
  > **Comments:**
  > **username_3**: This doesn't answer the initial question... Are there any such cameras available?  
  > **username_4**: Given that the OP gave me a "this answers my question" green check-mark, I take it that my restatement-and-answer was more valuable than a simple "no" or a "yes" will the many caveats explained in other answers/comments.  
  
  ---
  
  ### Answer by username_2 on 2017-06-06. Score: 1
  
  Yi Technologies action cameras have [lens distortion correction as a built-in feature](http://www.yitechnology.com/yi-4k-plus-action-camera-specs). The lens does introduce distortion but the onboard processor compensates for it.
  
  I assume we'll see more of this type of compensation embedded in cameras in the future.
  
  > **Comments:**
  > **username_0**: It is embedded in my Garmin Virb Ultra 30, but not in 4K mode.  
  > **username_3**: Embedded correction is much much worse than normal lens... You can not fully remove all distortions, sadly.  
  
  ---
  
  ### Answer by username_3 on 2018-06-30. Score: 0
  
  There are some of them:
  
  1) [Hawkeye Firefly 8S/8SE](http://cnfpv.com/portal.php?mod=view&aid=89)
  
  As from the official web site:
  
  > The camera comes with two lens option 170 and 90 degrees lens:
  >
  > * 170 degrees wide angle lens for action sports and
  > * 90 degree with linear lens for trips with your family.
  
  I think the last variant should do the job.
  
  
  ---
  
  