Fisheye questions  

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jimbee
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Fisheye questions

by jimbee » Sat Apr 15, 2017 5:54 pm

It seems that most articles I read recommend taking 8 images for a 360 panorama using a Fisheye lens-- including an up/down shot for zenith & nadir. Trying to understand why the up/down shots are necessary. Presently, using our 15mm non-fisheye lens, we're getting good results taking around 24 images in multiple rows where the top row captures the zenith and the bottom row captures the nadir-- with no straight up/down images (of course we have to fix the nadir with tripod in post with this method).

So it seems that were we to use a 15mm fisheye for example, we could use the same technique with less images but why would we need to take the up/down zenith/nadir images if those points are already captured?

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olivierbo
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Re: Fisheye questions

by olivierbo » Tue Apr 25, 2017 8:32 am

Hello,

Using a fisheye lens you need to shoot the nadir and zenith to avoid distorsion, if you are not using a full frame sensor, to have enough overlap, if you want to remove the tripod, etc. You can refer to this lens database for more information regarding the number of pictures you must shoot depending on the camera/lens couple: http://www.vrwave.com/panoramic-lens-database/
If we recommend the use of a fisheye it is just because you can shoot a 360 panorama with only few pictures ;)

Best regards,
Olivier

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jimbee
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Re: Fisheye questions

by jimbee » Sat Apr 29, 2017 4:09 pm

olivierbo wrote:Hello,

Using a fisheye lens you need to shoot the nadir and zenith to avoid distorsion, if you are not using a full frame sensor, to have enough overlap, if you want to remove the tripod, etc. You can refer to this lens database for more information regarding the number of pictures you must shoot depending on the camera/lens couple: http://www.vrwave.com/panoramic-lens-database/
If we recommend the use of a fisheye it is just because you can shoot a 360 panorama with only few pictures ;)

Best regards,
Olivier


Thanks for the input Oliver. Thanks also for the link-- very useful information.

We're using a Canon 5D Mark III with a Sigma 15-30 with good results. Given the $1k+ price for a new Canon Fisheye such as their 8-15mm I think we'll stick with our current setup for now. I can however envision certain circumstances where being able to capture a full 360 with less images would be an advantage.


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