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Forum:
Q & A
Thread:
Suspended Ceiling

Re: Suspended Ceiling Posted: 15 May 2008 at 9:52 GMT updated: 15 May 2008 at 9:56 GMT	go to thread
vrthree said: Why would you only take one image at 60-65 degrees? What does this achieve? It is enough to give good zenith coverage and (at this angle rather than +90 degrees) is more likely to provide a link to the main row to ensure easy stitching in a situation where a +90 degrees zenith shot might be featureless (for example, a plain blue sky or a white ceiling). Andrew
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Forum:
Q & A
Thread:
HDR vs EV results in PTGui / Lens hood on Nikkor 10.5

Re: HDR vs EV results in PTGui / Lens hood on Nikkor 10.5 Posted: 15 May 2008 at 7:59 GMT	go to thread
Hamish Tear said: Sorry Mediavets, There's one thing there I don't quite understand - when you say 'and one up at about +60-65 degrees' - does this mean one shot or one row? If one shot - I don't get it. Thanks, Hamish. One shot at +60-65 degrees - instead of a zenith shot at +90 degrees. Why? because if the zenith is, say, a featureless blue sky or a featureless interior ceiling, this technique is more likely to enable an easy stitch because you will be very likely to get overlapping features between the up shot and the main row shots. You will still get excellent coverage of the zenith. Wroks well for me. Andrew
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Forum:
Q & A
Thread:
Suspended Ceiling

Re: Suspended Ceiling Posted: 14 May 2008 at 22:02 GMT	go to thread
vrthree said: Any one got any hints or tricks on how to stitch panos with suspended ceiling? I am using a 10.5mm lens (6 images + zenith) and PTGui to stitch. Many thanks If the problem is that the zenith image lacks features to place control points then you might try a different shooting technique. As suggested by Hans N - when using my DX sensor DSLR with the Nikkor 10.5mm and NN5 pano head, I shoot 6-around at about -10 degrees and 1 up at +60-65 degrees. That give sgood zenitn coverage and also usually provides a good link between the main row and the 'zenith' shot - leaving just a small hole at the nadir. Andrew
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Forum:
Q & A
Thread:
Canon EOS 40D & Fisheye 8mm f/3.5 EX DG Users

Re: Canon EOS 40D & Fisheye 8mm f/3.5 EX DG Users
Posted: 14 May 2008 at 15:06 GMT
updated: 14 May 2008 at 15:08 GMT

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enbilaman said:
Hi Hans,
Optimized FOV is not always the right FOV.
Yes, I have observed the same. But the panorama may be seemingly good and complete even with a too small reported FOV for instance, and this puzzles me. There must be some image correction parameters that are activated but not reported.

Yes, agreed. I got good 360x180 coverage, and excellent stitch and render, with APP 1.4.2, with the image set when FOV is reported as 164.962 degrees and focal length as 10.34mm in the Move Images mode data table. Manually setting FOV to 180 produced a much inferior result.

Hmmmm........

Andrew

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Forum:
Q & A
Thread:
Canon EOS 40D & Fisheye 8mm f/3.5 EX DG Users

Re: Canon EOS 40D & Fisheye 8mm f/3.5 EX DG Users Posted: 14 May 2008 at 14:16 GMT updated: 14 May 2008 at 14:25 GMT	go to thread
mhc1 said: Andrew: this I can not prove: my Autopano (V1.4) has no holes when slanted. I´ll give it another try and report later. But me and another felow stitched it with the mentioned method in Autopano: no zenith hole and no nadir hole. Which was expected to be. Talking about slanted images though. You (and John H and Hans N) are right - I was just too careless about checking the default circle crop - I hadn't adjusted it! - with just a little adjustment of the FE crop it stitches just fine in APP v1.4.2 with no zenith or nadir holes - although blending at zenith was not great using Smartblend(which is what I would expect). When I shoot with a Nikon DX sensor camera and Sigma 8mm on my NN5 head I usually shoot 4 or 6 around at +5 degrees. This gives good (better) zenith coverage, stitches easily, is simpler to level and the nadir hole is no larger than the rotator of my NN5 pano head, which is neither here nor there whether or not one chooses to edit the nadir. The only 'point' I can see for a slanting technique would be to obtain 360x180 coverage in just three shots (rather than your 4 shots) which is what the Agno's MrotatorC head () which provides both slant and tilt was designed to achieve by Luca. He says you can do it with their RingTS8 head too as the ring has a 60 degree slant marking and the plastic 'liner' in the metal ring allows you to set a small tilt. It seems to me there are simpler techniques if one is going to take 4 (or more) shots. Andrew
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Forum:
Q & A
Thread:
Canon EOS 40D & Fisheye 8mm f/3.5 EX DG Users

Re: Canon EOS 40D & Fisheye 8mm f/3.5 EX DG Users Posted: 14 May 2008 at 11:52 GMT updated: 14 May 2008 at 11:53 GMT	go to thread
mhc1 said: 3. Slanted and levelled. means 60° slanted and tripod & camera levelled www.netzserver1.de/ptgroup/40DS8-slanted-levelled... No nadir and no zenith hole. More slant-info on the Agnos webside tinyurl.com/48k7mb ciao mike www.360de.de There are both zenitn and nadir holes when I stitched this set with Autopano Pro. Which is what I would have expected using Canon cropped sensor and Sigma 8mm. Andrew
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Forum:
Q & A
Thread:
HDR vs EV results in PTGui / Lens hood on Nikkor 10.5

Re: HDR vs EV results in PTGui / Lens hood on Nikkor 10.5 Posted: 14 May 2008 at 8:11 GMT updated: 14 May 2008 at 8:33 GMT	go to thread
Hamish Tear said: Thanks to you and Mediavets for your responses - I figured as much. I used to shoot with a Nikon D80 and a Sigma 8mm, so am used to the 'partial circular image' but have now switched to D300 and Nikkor 10.5. Anyway - is there any advantage to shaving off the lens hood - better stitching overlap, perhaps? Hamish. No, there is no advantage to be gained from shaving off the lens hood when using the Nikkor 10.5mm FE on a DX sensor Nikon DSLR like the D300. Overlap for stitching is determined by settings of the click stops on you pano head and shooting technique. For 360x180 panos using a DX sensor 6MP D40 and the Nikkor 10.5mm FE with an NN5 pano head. Manual focus (this lens doesn't autofocus on the D40 anyway), manual exposure, and preferably custom WB, I shoot 6 around at about -10 degress and one up at about +60-65 degrees. This leaves a small nadir 'hole' about the size of the rotator of the NN5 head and provides a good link between the main row and the 'zenith' shot. These image sets stitch very easily and well with AutoPano Pro with automatic CP detection (I seldom need to adust CPs automatically detected), and rendering with spline36 interpolator and Smartblend at 8000x4000 pixels. Andrew
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