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Thread: NN3 Calibration and potential problem

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weiyan

Posts: 41
Location: Hong Kong
Registered: 31 Oct 2013
NN3 Calibration and potential problem
Posted: 8 Nov 2013 at 2:50 GMT
This is the calibration of my NN3:
Camera: EOS M
Lens: EF-M 22mm

plus.google.com/photos/116209331971147838509/albu...
plus.google.com/photos/116209331971147838509/albu...

Is this calibration OK?

The potential problem: I moved the control plate to rear and push the cam to foremost to get this calibration. If I bought the EF-M 11-22mm, its has shorter focal length. Is this lens fail needs moving forward? This lens is longer than the 22mm pencake, may have a longer nodal point from sensor, but not sure. Is there any data of nodal point?

Samyang 8mm may not a problem, for its use SLR mount.

Thank you.
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Smooth

Posts: 4310
Location: Mount Panorama, Australia
Registered: 21 Jul 2004
Re: NN3 Calibration and potential problem
Posted: 8 Nov 2013 at 4:42 GMT
Your alignment looks to be fine.
Please show a picture of how you have mounted the camera.

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: 8 Nov 2013 at 8:29 GMT
The calibration looks good but close examination of the images in a stitch with PTGui to layered PSD does reveal some parallax shift that would be more obvious with full size images. However, you need to take more care when doing tests like this. Comparing images is much easier when you keep the exposure (and white balance) settings the same. Use the same settings as you would when shooting a panorama. Also bear in mind that when assessing the amount of parallax shift between a near and more distant object, it's desirable to have the objects as far apart as possible. In this case where the parallax shift of the near object is being measured against the music stand, the music stand is itself subject to significant parallax shift, which reduces the apparent shift being observed. It's better to open the curtains and use a much more distant object outside if possible to maximize the visible shift.

John
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Nick Fan
[NodalNinja]

Posts: 770
Location: Hong Kong
Registered: 26 May 2006
Re: NN3 Calibration and potential problem
Posted: 8 Nov 2013 at 8:51 GMT

weiyan said:

This is the calibration of my NN3:
Camera: EOS M
Lens: EF-M 22mm

plus.google.com/photos/116209331971147838509/albu...
plus.google.com/photos/116209331971147838509/albu...

Is this calibration OK?

The potential problem: I moved the control plate to rear and push the cam to foremost to get this calibration. If I bought the EF-M 11-22mm, its has shorter focal length. Is this lens fail needs moving forward? This lens is longer than the 22mm pencake, may have a longer nodal point from sensor, but not sure. Is there any data of nodal point?

Samyang 8mm may not a problem, for its use SLR mount.

Thank you.


calibration look good. If needed you can use a smaller camera knob to bring it forward by 12mm.
shop.nodalninja.com/nn3-small-knob-for-camera-or-...
Or get a T-adapter to move the camera forward to rotation center.
shop.nodalninja.com/t-adapter-iii-with-30mm-offse...
The 22mm lens is the thinnest lens at the moment. Other lens are longer and should not have any problem.

contact me by PM if you need further assistant.

Nick
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weiyan

Posts: 41
Location: Hong Kong
Registered: 31 Oct 2013
Re: NN3 Calibration and potential problem
Posted: 8 Nov 2013 at 8:56 GMT
Thank you.

plus.google.com/photos/+WeiyanWo/albums/550562000...
plus.google.com/photos/+WeiyanWo/albums/550562000...
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Smooth

Posts: 4310
Location: Mount Panorama, Australia
Registered: 21 Jul 2004
Re: NN3 Calibration and potential problem
Posted: 8 Nov 2013 at 9:10 GMT
Yes, that is what I needed to see.
As Nick mentions you need to smaller upper rail screw. John is also correct more care will be needed but there was no point going there until such time as knowing how the camera was mounted.

Really it is best suited to a lens ring. But I don't know if one exists for your choice of lenses?

Regards, Smooth cool
www.omnipix.com.au
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Nick Fan
[NodalNinja]

Posts: 770
Location: Hong Kong
Registered: 26 May 2006
Re: NN3 Calibration and potential problem
Posted: 8 Nov 2013 at 11:47 GMT
Hi Weiyan,

Contact me. I can give you a set of T-adapter and small camera mounting screw.

Greetings from HK.

Nick
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weiyan

Posts: 41
Location: Hong Kong
Registered: 31 Oct 2013
Re: NN3 Calibration and potential problem
Posted: 19 Nov 2013 at 4:02 GMT
updated: 19 Nov 2013 at 4:20 GMT
Thank you to all help. Nodal Ninja's customer service is awesome. I get the t-adapter and small knob. Re-calibrated the nodal point.

picasaweb.google.com/116209331971147838509/ZlZVh?...

picasaweb.google.com/116209331971147838509/ZlZVh?...

Test panorama. 18 photos in two rows stitched.
Mircosoft ICE.
A point appeared in the photos, don't know why this happen.
sky.easypano.com/panoramic-images/A-View-from-Fan...

EDIT
The dot on the photo is a dust on the sensor. Cleaned with the NN lens cloth. Not sure if this is correct way.
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Smooth

Posts: 4310
Location: Mount Panorama, Australia
Registered: 21 Jul 2004
Re: NN3 Calibration and potential problem
Posted: 19 Nov 2013 at 4:56 GMT

weiyan said:

The dot on the photo is a dust on the sensor. Cleaned with the NN lens cloth. Not sure if this is correct way.
Sensors should not be cleaned with a cloth. Blow the sensor clean with a squeeze air pump or a purpose built sensor cleaner. The chance of damaging the sensor is very high with a cloth.

Again your alignment looks OK, not perfect but completely usable.

As your link was wrong to the two test parallax shots I looked into your album and found the second image. I also noticed you have mounted your Nodal Ninja on top of a three way tilt/pan head. This is best avoided. Remove the 3 way head and mount the Nodal Ninja panohead directly to the tripod. Otherwise when you finally attempt a full spherical panorama you will have captured all the knobs/handles of the pan head making a complete mess of the nadir area of the panorama. The panohead should be in-line perfectly with the tripod centre column. To remove the 3 way pan head you will likely need to loosen three grub screws in the underside before screwing the pan head off the centre column.



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: 19 Nov 2013 at 8:48 GMT

Smooth said:

Again your alignment looks OK, not perfect but completely usable.

I agree with Smooth. It looks like the camera should be moved forwards a mm or two:



John
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hindenhaag

Posts: 901
Location: Netherlands
Registered: 7 Mar 2010
Re: NN3 Calibration and potential problem
Posted: 19 Nov 2013 at 8:57 GMT
Hi,

Did you contact Nick and did you get the smaller screw to replace the the rails knob? This will give you more room to move forward.

shop.nodalninja.com/nn3-small-knob-for-camera-or-...

Heinz
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weiyan

Posts: 41
Location: Hong Kong
Registered: 31 Oct 2013
Re: NN3 Calibration and potential problem
Posted: 19 Nov 2013 at 11:03 GMT
Received the t-adapter and smaller knob from Nick. Use the t-adapter alone give abundant headroom to move forward.

Agree should move forward 2mm. This lens cannot perfectly calibrated for it has no focusing scale.

Removing the pan tilt head is good idea, for its the heaviest in my gear. Without it I can hike more miles.

In coming days I will calibrate my mind set to take better panoramas.
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weiyan

Posts: 41
Location: Hong Kong
Registered: 31 Oct 2013
Re: NN3 Calibration and potential problem
Posted: 19 Nov 2013 at 11:25 GMT
Find out another problem:

Horizontal calibration error. Should move 6mm leftward. This mistake should not happen.

www.flickr.com/photos/woweiyan/10942723633/
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Smooth

Posts: 4310
Location: Mount Panorama, Australia
Registered: 21 Jul 2004
Re: NN3 Calibration and potential problem
Posted: 19 Nov 2013 at 11:58 GMT
updated: 19 Nov 2013 at 11:59 GMT

weiyan said:

Find out another problem:

Horizontal calibration error. Should move 6mm leftward. This mistake should not happen.

www.flickr.com/photos/woweiyan/10942723633/
You should not use the camera screen/view finder as a way of calibrating your left to right lower rail position. This is because the camera sensors are rarely exact from one to another. It is though a reasonable way to get started on finding the NPP.

Please refer to my tutorial: www.easypano.com/forum/display_topic_threads.asp?...

I also would remove the 3 way pan head before realigning.

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: 20 Nov 2013 at 4:33 GMT
Calibrated the lower arm.

14 -90 shots.
Is 46mm best?

Can't make the Nodal Noinja clear and the tiles perfectly align.

45mm
www.flickr.com/photos/woweiyan/10955980686/

46mm
www.flickr.com/photos/woweiyan/10956138313/

47mm
www.flickr.com/photos/woweiyan/10956075774/
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