spwd01
Posts: 8
Location: Blooming Grove, NY, United States
Registered: 24 May 2005
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Nadir Capture Advice?
Posted: 7 Jun 2005 at 18:33 GMT
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Can anyone give me advice on the best way to capture a nadir image when you are indoors working in low lights? I see so many indoor panos with a full nadir image without a tripod cap. How do you do it hand held? The only way I see it being possible is using a flash or changing the ISO to 1600. IMO neither is a good option. I am looking to stitch for both a java viewer and QTVR.
Any Advice?
Thanks
SPWD01
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John Houghton
Posts: 3487
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
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Re: Nadir Capture Advice?
Posted: 7 Jun 2005 at 21:37 GMT
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I suppose it depends on what you mean by low lights. The accepted rule of thumb for exposure time to avoid camera shake is 1/focal length. So for a 50mm lens that would be 1/50th sec. For an 8mm fisheye, you should be able to get away with 1/8th second if necessary. I have certainly done a few at 1/10th and they were fine, and that was at ISO 100.
John
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spwd01
Posts: 8
Location: Blooming Grove, NY, United States
Registered: 24 May 2005
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Re: Nadir Capture Advice?
Posted: 8 Jun 2005 at 18:14 GMT
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John,
Thanks for your advice,
However, because I can't use flash with Pannos my only light is window light. At shudder speeds below 1/60th of a second you will see noticeable motion blur no mater what lens focal length you are using. I have never heard of the lens focal length having anything to do with shutter speed and motion blur except that it is more noticeable with telephoto lenses due to circles of confusion.
As an interior architectural photographer I am often photographing with shutter speeds in the 1/30 - 8 sec or more in order to use the desired depth of field of f8 - f32. And with those exposures I am using a few flash heads with umbrellas to fill in the shadows. I am doing (trying to learn how to do) high end multirow panos with a 14mm rectilinear lens at f 8. How are other interior photographers hand holding for the nadir when the light source and focal length calls for a longer shutter speed then 1/60 second. Are you using a boom arm with a tripod or are you not shooting below 1/60th? If not how are you avoiding this?
Thanks SPWD01
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Christian Gavin
Posts: 13
Location: San Francisco Bay Area, United States
Registered: 8 Jul 2004
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Re: Nadir Capture Advice?
Posted: 30 Jun 2005 at 20:45 GMT
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I found an esay way to capture the ground.
Instead of having the panoramic head bracket oriented toward the center of the tripod, orient it 180 degrees away from the center of the tripod, and move the bracket as far as you can from the center of the tripod on the rotator (at least my Kaidan pano head can do that, I don't know about others).
Now with the camera pointing 90 degrees down you can take 2 pictures of the ground 180 degrees apart. In my setup I still see 2 legs of the tripod, but by taking 2 pictures it covers enough area.
Here is a pano I took with a 1.5 second exposure:
www.photopano.net/panos/showfullscreen.php?index=...
Have fun  !
CG
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