# Wide angle lens center of projection

**URL:** <https://discuss.bluerobotics.com/t/wide-angle-lens-center-of-projection/4961>\
**Category:** Sensors\
**Created:** [April 29, 2019, 7:15pm UTC](https://discuss.bluerobotics.com/t/wide-angle-lens-center-of-projection/4961 "2019-04-29T19:15:34Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![clyde](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/clyde/32/8563_2.png) [@clyde](https://discuss.bluerobotics.com/u/clyde)\
**Post date:** [April 29, 2019, 7:15pm UTC](https://discuss.bluerobotics.com/t/wide-angle-lens-center-of-projection/4961/1 "2019-04-29T19:15:34Z")

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Hi, folks –

I’m planning to do some computer vision processing using the “Raspberry Pi Camera Module v2 w/ Wide Angle Lens”. I’ll be mounting these behind the 2" series hemispherical domes. To avoid additional distortion due to refraction, I need to mount these fairly precisely so that the center of projection of the lens is at the center of the sphere. I can figure this out by trial-and-error, but it would help me to get a sense of how the lens is actually built. Can you point me to the spec sheet for the M12 wide angle lens that comes with the kit?

Thanks!

/Clyde

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**Author:** ![clyde](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/clyde/32/8563_2.png) [@clyde](https://discuss.bluerobotics.com/u/clyde)\
**Post date:** [April 29, 2019, 7:24pm UTC](https://discuss.bluerobotics.com/t/wide-angle-lens-center-of-projection/4961/2 "2019-04-29T19:24:57Z")

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Also: the radius of the sphere for the 2" series dome appears to be 20mm. Is that accurate? Thanks.

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**Author:** ![jwalser](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/jwalser/32/2234_2.png) [@jwalser](https://discuss.bluerobotics.com/u/jwalser)\
**Post date:** [May 14, 2019, 4:25pm UTC](https://discuss.bluerobotics.com/t/wide-angle-lens-center-of-projection/4961/3 "2019-05-14T16:25:11Z")

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bump @kklemens

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**Author:** ![kklemens](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/kklemens/32/2247_2.png) [@kklemens](https://discuss.bluerobotics.com/u/kklemens)\
**Post date:** [May 18, 2019, 12:04am UTC](https://discuss.bluerobotics.com/t/wide-angle-lens-center-of-projection/4961/4 "2019-05-18T00:04:05Z")

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@clyde Sorry for the delay!

We don’t have any more information on how the lens is constructed other than the data on the product page that the original manufacturer has provided to us. We do not have any more information on the internals of the lens.

The Outer Diameter of the 2" Dome is 20.5mm, that is correct.

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**Author:** ![clyde](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/clyde/32/8563_2.png) [@clyde](https://discuss.bluerobotics.com/u/clyde)\
**Post date:** [May 21, 2019, 3:47pm UTC](https://discuss.bluerobotics.com/t/wide-angle-lens-center-of-projection/4961/5 "2019-05-21T15:47:38Z")

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Thanks for the info!