Bartosz Góralewicz
Posts: 23
Location:
Registered: 15 Jan 2011
|
Cant align straight surfaces in PTgui
Posted: 15 Jan 2011 at 1:04 GMT
updated: 15 Jan 2011 at 1:32 GMT
|
|
HI guys,
Im totally new to this and for a while now I am fighting with 1 problem.
I started with panoramas as I got an easy access (my wife is a photographer) to photo equipment. I only bought a pano head and a 14mm Samyang.
I use Nikon D3x + 14mm Samyang UMC.
I stitch with PTGui and here is my problem:
I usually do a lot (14 - 16) photos at 90 degrees and then 2 nadir and 2 zenith.
Everything seems to be fine, but every time straight long surfaces have misalignments.
Sample:
I triple checked the pano head setting and seems to be ok. I make sure it is leveled fine etc. There is a little bit of shaking, as the D3x is really heavy, so maybe that might be a problem?
I also know that Samyang is not a straight lens (mustache distortion), so maybe that is the problem?
Please help me if u can, cause Im helpless here. 
|
|
alert moderator
|
|
Seba
Posts: 77
Location: Kuala Lumpur, Malaysia
Registered: 19 Aug 2005
|
Re: Cant align straight surfaces in PTgui
Posted: 15 Jan 2011 at 1:51 GMT
|
|
I'm sorry to disappoint Bartosz, but I believe your head is not properly set.
I own the Nodal Ninja pano head, and I strictly followed recommended settings provided by the company, specific to my set up, yet I had the same problem.
It was while later, with help from John Houghton, the forums regular participant and his tutorials, that I managed to get it align manually and properly.
You may want to check it out: www.johnhpanos.com/tuts.htm
Also, I believe you could correct these problems in PTgui, tho I'm not that proficient to advice on how to go around that. After all, John managed to fix my panos, which were far worse than yours 
regards
Seba
|
|
alert moderator
|
|
Smooth
Posts: 3774
Location: Mount Panorama, Australia
Registered: 21 Jul 2004
|
Re: Cant align straight surfaces in PTgui
Posted: 15 Jan 2011 at 4:42 GMT
|
|
Seba is correct in stating your panohead position is not set correctly.
The left to right alignment is out on the lower rail which is more critical than the fore and aft position on the upper rail. Though, both should set correctly.
Take a look at my tutorial at www.easypano.com/forum/display_topic_threads.asp?...
Do not reply on the numbers offered up by the NN website as they are often inaccurate, sometimes wildly inaccurate. Consider them as maybe a starting point only.
You also should be checking boxes D & E in PTGui for Image Shift in the Advance options in the Optimizer (Tab) Both Vertical and Horizontal Shift.
Regards, Smooth 
www.omnipix.com.au
|
|
alert moderator
|
|
Doug Aurand
Posts: 3282
Location: Albuquerque, NM, United States
Registered: 2 Jan 2008
|
Re: Cant align straight surfaces in PTgui
Posted: 15 Jan 2011 at 5:43 GMT
|
|
If Smooth is right and your positon on the lower rail is off, a very simple way to tell is to postion the camera for the Nadir shot and look through the viewfinder and see if the center marker on your camera is centered on the hub of your panoramic tripod head
On my Canon XTi, there's a square box in the center of the viewfinder that fits around the screw head on the hub of my Nodal Ninja 3 with the upper rail at 0 degrees aimed straight down.
Doug Aurand
Albuquerque, NM
|
|
alert moderator
|
|
Smooth
Posts: 3774
Location: Mount Panorama, Australia
Registered: 21 Jul 2004
|
Re: Cant align straight surfaces in PTgui
Posted: 15 Jan 2011 at 6:03 GMT
|
|
Doug Aurand said: If Smooth is right and your positon on the lower rail is off, a very simple way to tell is to postion the camera for the Nadir shot and look through the viewfinder and see if the center marker on your camera is centered on the hub of your panoramic tripod head
On my Canon XTi, there's a square box in the center of the viewfinder that fits around the screw head on the hub of my Nodal Ninja 3 with the upper rail at 0 degrees aimed straight down.
Doug Aurand
Albuquerque, NM
That again at best, is a starting point. It is not an accurate way of finding the exact position.
Regards, Smooth
www.omnipix.com.au
|
|
alert moderator
|
|
Peter Farrington
Posts: 113
Location: Lowestoft, United Kingdom
Registered: 3 Jun 2010
|
Re: Cant align straight surfaces in PTgui
Posted: 15 Jan 2011 at 7:33 GMT
|
|
Smooth said: Take a look at my tutorial at www.easypano.com/forum/display_topic_threads.asp?...
I would completely endorse Smooth's tutorial for LOWER ARM ADJUSTMENT, having used it myself when I first started some 8 months ago (and still learning). It's definitely worth the time spent.
Regards,
Peter
|
|
alert moderator
|
|
hindenhaag
Posts: 729
Location: Netherlands
Registered: 7 Mar 2010
|
Re: Cant align straight surfaces in PTgui
Posted: 15 Jan 2011 at 7:33 GMT
updated: 15 Jan 2011 at 7:57 GMT
|
|
Hi Bartosz,
Normally you should be off with six shots around per row, 1 Zenith at +90° and 2 Nadir at-90°.
www.frankvanderpol.nl/fov_pan_calc.htm
For exact lower rail settings use Smooth's Tutorial. Easy to use: if the cutting tooth of the hacksaw cuts to the right, move to right mm by mm. If it cuts to the left, move to the left. Having found the setting, just re check but moving 1mm to the sides to watch the cutting tooth changing sides.
I use 89 for LRS = Lower rail Setting for my D3 on NN5
For the upper rails settings use this:
www.johnhpanos.com/epcalib.htm
Plus check your exif data info for your lens in PTGui, may be the automatic setting is wrong for your lens. Have a look to preferences: click PTGuiPro on top, preferences, and open Exif tab.
If you still sit with problems with the 14mm Samyang, you may try to contact Andrew Badderly, he is "Samyang specialist". But in first case you should try to find out yourself.
UK Nodal Ninja Distributor
My eCommerce Store: www.360tacticalvr.com
My eBAY UK Store:stores.eBay.co.uk/360tacticalvr
When you are sure about your settings, you should try to learn how PTGui is setting controlpoints in the control point tab by checking pics one combination to the next. 1-2, 2-3, 3-4 etc. You will often find Cp's in a bulk, not being spread nicely to the outside of the lens and in clear vertical and horizontal lines. You have to add them manually. Around 4 should help.
To test it you may download a set of my pics. Shot at 0°, 5°, 7.5° around, 2x 60° to learn about horizontal connection of the lens, plus Z and 2 Nadir shot taken with the NN Nadir Adaptor. You will realize bulks of CP's around the washing basin, stitching errors specially on top around the lamp. You can use the orange dots, being laser placed to vertical and horizontal.
homepage.mac.com/hindenhaag/filechute/D300s_Samya...
Sucess.
Cheers,
Heinz
|
|
alert moderator
|
|
Bartosz Góralewicz
Posts: 23
Location:
Registered: 15 Jan 2011
|
Re: Cant align straight surfaces in PTgui
Posted: 15 Jan 2011 at 8:28 GMT
|
|
Wow, thank u guys - its so nice to see that so many of u wants to help me
Just woke up - I'll check the links u gave me and I'll calibrate my head again today and check if all is ok!
Thanks again !!!
|
|
alert moderator
|
|
Hans Nyberg
Posts: 2791
Location: Denmark
Registered: 28 Aug 2005
|
Re: Cant align straight surfaces in PTgui
Posted: 15 Jan 2011 at 9:27 GMT
|
|
Bartosz Góralewicz said: Wow, thank u guys - its so nice to see that so many of u wants to help me
Just woke up - I'll check the links u gave me and I'll calibrate my head again today and check if all is ok!
Thanks again !!!
First check if you have optimized correctly. You need to optimize for all options.
Also for horizontal and vertical shift. Ptgui does not optimize for shift as default and this is a typical shift error.
You need to use the advanced optimizer.
Hans
|
|
alert moderator
|
|
Smooth
Posts: 3774
Location: Mount Panorama, Australia
Registered: 21 Jul 2004
|
Re: Cant align straight surfaces in PTgui
Posted: 15 Jan 2011 at 9:42 GMT
|
|
Hans Nyberg said: First check if you have optimized correctly. You need to optimize for all options.
Also for horizontal and vertical shift. Ptgui does not optimize for shift as default and this is a typical shift error.
You need to use the advanced optimizer.
Hans
I think I already pointed that out Hans.
Regards, Smooth
|
|
alert moderator
|
|
Hans Nyberg
Posts: 2791
Location: Denmark
Registered: 28 Aug 2005
|
Re: Cant align straight surfaces in PTgui
Posted: 15 Jan 2011 at 10:29 GMT
|
|
Yes, discovered that, after my post. But it can not be pointed out too many times.
Hans
|
|
alert moderator
|
|
mediavets
Posts: 1980
Location: Isleham, Cambs., United Kingdom
Registered: 8 Feb 2008
|
Re: Cant align straight surfaces in PTgui
Posted: 15 Jan 2011 at 11:59 GMT
updated: 15 Jan 2011 at 12:03 GMT
|
|
hindenhaag said: Hi Bartosz,
Normally you should be off with six shots around per row, 1 Zenith at +90° and 2 Nadir at-90°.
www.frankvanderpol.nl/fov_pan_calc.htm
I think he has the 14mm wide angle rectilinear Smayang lens, not the 8mm fisheye.
The vrwave lens database:
www.vrwave.com/panoramic/photography/lens_databas...
suggests this shooting pattern for a 14mm rectilinear lens on a fullframe sensor body:
Min. shots (full frame): N(adir), 6 images every 60° at -30° pitch, 6 images every 60° at +30° pitch, Z(enith).
Andrew
|
|
alert moderator
|
|
enbilaman
Posts: 123
Location:
Registered: 3 Mar 2006
|
Re: Cant align straight surfaces in PTgui
Posted: 15 Jan 2011 at 12:48 GMT
|
|
Hi Andrew,
I usually shoot 6+6 (-30°;+30°) as you suggest:
michel.thoby.free.fr/Web_Gallery_&_Tests/Samyang%...
I have just made a check with the Samyang 14 mm on a Canon EOS 5DII and to my amazement 6+Z+N works fine!
There is a very little overlap at some places but there is enough overlap. No gap in the output panorama.
Michel
|
|
alert moderator
|
|
badders
Posts: 384
Location: East Kilbride, United Kingdom
Registered: 5 Dec 2007
|
Re: Cant align straight surfaces in PTgui
Posted: 15 Jan 2011 at 13:35 GMT
|
|
We've tested the Samyang 14mm on full frame and determined you only need 6 around plus 1 zenith/nadir. So 7 shots total or 8 if you want to fill the nadir as well.
On reduced sensors we needed 2 x rows of 8 @ +/- 30 degs plus 2 x zenith/nadirs @ 60 degs each.
Andrew Baddeley
www.360tacticalvr.com
stores.ebay.co.uk/360tacticalvr
|
|
alert moderator
|
|
Hans Nyberg
Posts: 2791
Location: Denmark
Registered: 28 Aug 2005
|
Re: Cant align straight surfaces in PTgui
Posted: 15 Jan 2011 at 14:24 GMT
updated: 15 Jan 2011 at 14:24 GMT
|
|
badders said: We've tested the Samyang 14mm on full frame and determined you only need 6 around plus 1 zenith/nadir. So 7 shots total or 8 if you want to fill the nadir as well.
On reduced sensors we needed 2 x rows of 8 @ +/- 30 degs plus 2 x zenith/nadirs @ 60 degs each.
Andrew Baddeley
www.360tacticalvr.com
stores.ebay.co.uk/360tacticalvr
Than it is not a 14mm. At least not a standard rectilinear. As far as I remember it has a gigantc barrel distortion also so that might indicate that it has somewhat fisheye construction.
I have a 14mm Sigma and there is no way to shoot 6+1+1
Even 6 + 2 zenith at 90 degree rotation may give you holes.
The min is 6 + 3+3 at +-45 degrees but the overlap at the critical areas is almost none.
Even with my 12-24 mm you need to do 6+2 at 90 and 2 at -90 as min.
Hans
|
|
alert moderator
|
|
back to threads list |
this thread is closed
Prev
