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Thread: NN3 Calibration and potential problem

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hindenhaag

Posts: 901
Location: Netherlands
Registered: 7 Mar 2010
Re: NN3 Calibration and potential problem
Posted: 20 Nov 2013 at 6:37 GMT
46mm seams to be ok. No teeth on the circle.

Import a set of pics to PTGuiPro, go to >optimizer and set "minimize lens distortion" to "Heavy + Lens Shift"

Heinz
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Smooth

Posts: 4310
Location: Mount Panorama, Australia
Registered: 21 Jul 2004
Re: NN3 Calibration and potential problem
Posted: 20 Nov 2013 at 7:21 GMT
weiyan,

In the base of the Nodal Ninja panohead you have two holes one in the centre and one offset. The offset hole is to "store" the thread adapter. Either place or remove the thread adapter from the centre hole to allow your panohead to mount using the centre screw hole.

As Heinz mentions you need to choose "Heavy + Lens Shift" in the PTGui Optimizer. Or in Advance>> mode select the first 6 check boxes and then optimize.

Regards, Smooth cool
www.omnipix.com.au
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John Houghton

Posts: 3935
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
Re: NN3 Calibration and potential problem
Posted: 20 Nov 2013 at 8:30 GMT

hindenhaag said:

Import a set of pics to PTGuiPro, go to >optimizer and set "minimize lens distortion" to "Heavy + Lens Shift"

The important thing is to have control points assigned only on the floor in the background. The automatic generation of control points is likely to create points on the tripod etc. and these must be deleted.

An alternative way of setting the lower rail position is to use a method similar to that used for the upper rail setting. What you do is take two shots with the camera pointing directly at the near object (the pole), but rotate the upper and lower rails through 180° between shots. Check for parallax shift between the two shots. You can check for horizontal and vertical shift at the same time.

John
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weiyan

Posts: 41
Location: Hong Kong
Registered: 31 Oct 2013
Re: NN3 Calibration and potential problem
Posted: 20 Nov 2013 at 15:00 GMT
There are many control points in the NN logo. These fade control points mess up the stitch. Its better to cover the logo with black paper.
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Smooth

Posts: 4310
Location: Mount Panorama, Australia
Registered: 21 Jul 2004
Re: NN3 Calibration and potential problem
Posted: 20 Nov 2013 at 15:15 GMT

weiyan said:

There are many control points in the NN logo. These fade control points mess up the stitch. Its better to cover the logo with black paper.
You do not want any control points on the panohead or the tripod. You can add a layer mask in PTGui Pro to cover any area you do not want control points to be placed. Add mask, align images, check stitch and remove mask before publishing the panorama/stitch.

Regards, Smooth cool
www.omnipix.com.au
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weiyan

Posts: 41
Location: Hong Kong
Registered: 31 Oct 2013
Re: NN3 Calibration and potential problem
Posted: 21 Nov 2013 at 6:12 GMT
With NADIR adapter, the calibration not the same.

The perfect point should between 37 and 38.

www.flickr.com/photos/woweiyan/10973346893/
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Smooth

Posts: 4310
Location: Mount Panorama, Australia
Registered: 21 Jul 2004
Re: NN3 Calibration and potential problem
Posted: 21 Nov 2013 at 6:53 GMT
Your image shows that vertical arm on the lower rail needs to be moved to the right a little (when viewed from behind the camera).



There should be no evidence of saw tooth pattern. You are looking for a perfect circle made from stitched images that contain no control points on any part of the tripod or panohead.

Regards, Smooth cool
www.omnipix.com.au
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weiyan

Posts: 41
Location: Hong Kong
Registered: 31 Oct 2013
Re: NN3 Calibration and potential problem
Posted: 21 Nov 2013 at 8:21 GMT
Final calibration:
Lower 40, upper 67
Horizontal and vertical flip flop for the images.
It still not perfect. Too tiered. If useful is OK.
www.flickr.com/photos/woweiyan/10974826124/
www.flickr.com/photos/woweiyan/10974826844/

The last tripod calibration image updated.
Mask out the tripod to avoid control points. Then erase all mask before creation. The logo has offset.
www.flickr.com/photos/woweiyan/10973346893/
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hindenhaag

Posts: 901
Location: Netherlands
Registered: 7 Mar 2010
Re: NN3 Calibration and potential problem
Posted: 21 Nov 2013 at 12:50 GMT
updated: 21 Nov 2013 at 12:52 GMT
Weiyan,

Using the Nadir Adapter on NN3 you have to reduce the LRS by 6mm because of the offset of the foot of vertical rail.

www.nodalninja.com/Manuals/nadiradapterQRG_full.p...

Heinz
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weiyan

Posts: 41
Location: Hong Kong
Registered: 31 Oct 2013
Re: NN3 Calibration and potential problem
Posted: 21 Nov 2013 at 14:44 GMT
updated: 21 Nov 2013 at 14:47 GMT
Thank you.
But I do think previous calibration is not correct. Many control points in the NN logo so the floor is distorted.
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Johnytuono

Posts: 21
Location: United Kingdom
Registered: 27 Apr 2013
Re: NN3 Calibration and potential problem
Posted: 21 Nov 2013 at 14:53 GMT
updated: 21 Nov 2013 at 14:54 GMT
"An alternative way of setting the lower rail position is to use a method similar to that used for the upper rail setting. What you do is take two shots with the camera pointing directly at the near object (the pole), but rotate the upper and lower rails through 180° between shots. Check for parallax shift between the two shots. You can check for horizontal and vertical shift at the same time."

Can you elaborate more on this lower rail setting test please John....I can't picture what you mean.
Thanks
John
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hindenhaag

Posts: 901
Location: Netherlands
Registered: 7 Mar 2010
Re: NN3 Calibration and potential problem
Posted: 21 Nov 2013 at 17:42 GMT
Weiyan,

Test John's method: Make a picture -90° direct to the logo, logo in the middle of the pic. Camera on the right site.Then turn your panohead around by 180°, camera on the left side, take another picture. Import the two pics to photoshop. Open the view for two pics aside one another. Choose the "move Function". Choose opacity for the pic on the right 50%. Then choose "move function" and move the pic from the right on top of the picture on the left. When it is exactly on top, you can see the differences on the logo etc. You can try to see it by switching on and off the "eye" in the right box of the right pic.

Heinz
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John Houghton

Posts: 3935
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
Re: NN3 Calibration and potential problem
Posted: 21 Nov 2013 at 19:26 GMT
updated: 21 Nov 2013 at 19:37 GMT

Johnytuono said:

Can you elaborate more on this lower rail setting test please John....I can't picture what you mean.

John, You just take two shots with the camera in the positions shown below:


If the entrance pupil is aligned with the vertical axis of rotation of the panohead, no parallax shift should be seen between a near object (pole) seen against a distant background. It's much the same test as mentioned in my tutorial where you observe the entrance pupil directly and check for a sideways shift, but this cannot be done with the mirrorless camera used by weiyan.

John
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Johnytuono

Posts: 21
Location: United Kingdom
Registered: 27 Apr 2013
Re: NN3 Calibration and potential problem
Posted: 21 Nov 2013 at 20:15 GMT
Ah I see....thanks John.......Weiyan....sorry to hijack
John
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weiyan

Posts: 41
Location: Hong Kong
Registered: 31 Oct 2013
Re: NN3 Calibration and potential problem
Posted: 21 Nov 2013 at 23:48 GMT
Worry for some confusion.

Why cannot done with mirroless camera?
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