klaus mayer
Posts: 79
Location: Australia
Registered: 15 Jan 2008
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Minimum number of shots with Sigma 10-20mm for full 360°
Posted: 3 Jun 2008 at 0:08 GMT
updated: 3 Jun 2008 at 0:10 GMT
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What is the minimum number of shots I have to take with a Sigma 10-20mm to get a full 360° (with 1.5 ratio CCD)?
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Bill808
Posts: 1
Location: Hawaii, United States
Registered: 3 Jun 2008
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Re: Minimum number of shots with Sigma 10-20mm for full 360°
Posted: 3 Jun 2008 at 0:32 GMT
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If you're shooting horizontally, 5 shots will give you 15 degrees overlap on each side of every frame. This is cutting it pretty close - especially with the distortion of that lens at 10mm.
If you're shooting vertically, you will need 9 shots and still have only about 14 degrees overlap on each side of every frame, again shooting at 10mm.
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klaus mayer
Posts: 79
Location: Australia
Registered: 15 Jan 2008
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Re: Minimum number of shots with Sigma 10-20mm for full 360°
Posted: 3 Jun 2008 at 1:11 GMT
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Sorry, I should have been a bit more specific. I meant a full spherical pano.
I believe you can get 1 row from 8 portrait shots (75° HFOV) with 25% overlap (www.frankvanderpol.nl/fov_pan_calc.htm).
My main interest is in the strategy to get a full spherical with minimum number of shots, i.e. how many rows and if I can take less shots for upper/lower rows.
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Pete Loud
Posts: 147
Location: United Kingdom
Registered: 14 Oct 2006
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Re: Minimum number of shots with Sigma 10-20mm for full 360°
Posted: 3 Jun 2008 at 1:21 GMT
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With my Canon 350D, with a 1.6 sensor, I am able to do a full spherical pano with 14 shots, but I don't.
It is much better to settle for 20 shots, 8, then 6 up & 6 down and have plenty of overlap.
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Philip Warner
Posts: 23
Location: Austin, United States
Registered: 14 Mar 2008
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Re: Minimum number of shots with Sigma 10-20mm for full 360°
Posted: 3 Jun 2008 at 4:03 GMT
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Klaus,
I'm using the Sigma 10mm lens on a Canon 30D. Shooting 6+1+1 works great. 5 around might work but you'll have no room for error and that 6th shot only takes a few extra seconds.
Phil
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John Houghton
Posts: 2266
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
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Re: Minimum number of shots with Sigma 10-20mm for full 360°
Posted: 3 Jun 2008 at 6:58 GMT
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Philip: I think your lens is the 10mm fullframe fisheye, so not comparable with the 10-20mm Sigma.
Klaus: It's very easy to work out possible shooting configurations using PTGui's Panorama Editor window, as described at the end of this thread:
www.panoguide.com/forums/qna/4847/
Doing this, it seems that two rows of 6 at +/-40 pitch would be possible, preferably with the top row taken at yaw settings 0,60,120... and the bottom row at 30,90,150... I wouldn't recommend this arrangement, though. The central horizontal band is where most of the interesting detail often lies, and here the image quality is the worst (from the edge of the images) and there are a mass of joins there too, with small overlaps.
John
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marcus newey
Posts: 127
Location: somerset, United Kingdom
Registered: 23 Oct 2005
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Re: Minimum number of shots with Sigma 10-20mm for full 360°
Posted: 3 Jun 2008 at 8:47 GMT
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As John has suggested, shooting two rows, one tilited up and one down can work but I don't think it's the best solution.
I found that 8 around then 4 at -45deg and 4 at +45deg, plus Z and N
gave the best results
That's 18 in all, you could get away without the Z and N shots.
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Matt Rogers
[360 Precision]
Posts: 209
Location: Oxford UK, United Kingdom
Registered: 16 Jun 2005
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Re: Minimum number of shots with Sigma 10-20mm for full 360°
Posted: 3 Jun 2008 at 9:44 GMT
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Or you can shoot 6 around at 0º with 3 at +90 and 3 at -90. This is optimal as far as minimising the number of images is concerned but not really optimal from a workflow perspective. The overlap between the ±90 rows and the horizontal row is minimal and will only work in certain situations.
Matt
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