Low Light Rig / 5D results

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rlasater
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Low Light Rig / 5D results

Post by rlasater » Fri Oct 01, 2010 11:20 pm

I have been meaning to put this up a little sooner. Sorry for the delay!

This pano is, believe it or not, a low resolution version from a historic documentation we completed last month. The image is in the attic of a 150 year old working man's cottage located in Houston. The only existing light source were the slits in the walls.

We built a lighting rig with off the shelf parts, and using HDR photography obtained some fantastic results. This was also shot with our Canon 5D camera and the 8mm Sigma lens that comes with the nodal ninja kit. With the full frame 24 megapixel camera we get incredible detail, and since the lens is effectively much wider on this camera we only have to use the really good part of the image.

We ran the camera remotely from a laptop. And, since you can switch it to video mode, were able to view the scene in real time and correct the usual focus problems associated with low light and the super wide lens.

This links to a 4 meg pano

http://www.smartmm.com/examples/cottage_pano.mov

SM_Cottage_IMG_0054a_b_cAuto Panorama.jpg
This equirectangular version is 635K. The original is 25megabytes and 6000 pixels wide. Notice the even lighting?
closeup_Cottage_IMG_0054a_b_cAuto Panorama.jpg
This is a clip from the above image at full resolution, but jpeged. Remember, no flash. Just our light rig
SM9_0012.JPG
It really was dark! and also hot, about 100' and 95% humidity
SM9_0014.JPG
Our rig consists of a 14 inch fluorescent tube that is held around the lens by a bracket attached to the ninja arm. The round light is what produces the even exposure. Next version will be DC though and possibly an LED ring instead of a tube.
SM9_0015.JPG
Yes its held together with actual rubber bands!
SM9_0013.JPG
Of course the scanner got its turn.
SM9_0022.JPG
And yes we did the outside too.
SMA6-0044.jpg
We have also used the rig on a steam engine documentation. This is the crankshaft of the Battleship TEXAS. It is almost 100 years old.
CUA6-0044.jpg
Some detail
SM9_0007.JPG
The only drawback is that the whole thing tends to burst into flames occasionally! :D

Cheers!
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Richard Lasater
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richard.lasater@laserscanning.org.uk

Geoscan
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Re: Low Light Rig / 5D results

Post by Geoscan » Fri Oct 01, 2010 11:37 pm

The old ring of fire.

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Jason Warren
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Re: Low Light Rig / 5D results

Post by Jason Warren » Sat Oct 02, 2010 10:20 am

nice work Richard ;)
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Re: Low Light Rig / 5D results

Post by rlasater » Mon Oct 04, 2010 4:46 am

It works so well that we are thinking it will be better to record exteriors at night. One drawback is the tube light is greenish, the LEDs should solve this.
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Re: Low Light Rig / 5D results

Post by Phil Marsh » Mon Oct 11, 2010 10:43 am

WOW great results with this ring. Is a 'patent' pending :D

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Re: Low Light Rig / 5D results

Post by charlesw » Thu Jul 11, 2019 6:58 pm

We have also toyed with various lighting rigs for 360° photo capture in dark areas. Would be greatly chatting about more details on this rig or others that may arose since so we could bounce ideas off one another.

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