D300, Samyang 8mm, w/ NN5L

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  1. D300, Samyang 8mm, w/ NN5L

    #1
    Users Country Flag
    Join Date: Nov 2010
    Location: Cincinnati, OH
    Posts: 33

    Have big problem in finding NPP.
    I followed 2ND link posted by Heinz and cannot get it correctly after many tries.
    What am I doing wrong?
    Attached Thumbnails Attached Thumbnails Click image for larger version

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ID:	117   Click image for larger version

Name:	NPP_trying.jpg
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ID:	118  
    Last edited by Adamo; 11-20-2010 at 01:06 PM.
  2. #2

    The curving lines on the floor in the second image indicate that the optimization has gone awry. You should check that control points have not been assigned on the tripod and head. If they have, delete them and reoptimize. You can also try using the "Delete worst control points" option on the Control Points menu. It may be necessary to reset the lens parameters a,b,c to 0 before doing a further optimization. To do this, switch into Advanced mode via the button on PTGui's Project Assistant tab, and select the Lens Details tab.

    John
  3. #3
    Users Country Flag badders's Avatar
    Join Date: Jan 2009
    Location: East Kilbride, Scotland
    Posts: 349

    Looks like you are taking 6 shots around? You only need 4 shots around tilted down at -15degs plus one shot up tilted up at 60 degs for a full 360 x 180 with this lens and the D300. What software are you using to stitch? Are you telling it the correct initial lens parameters?



    Badders
  4. #4
    Users Country Flag
    Join Date: Aug 2008
    Location: Netherlands
    Posts: 1,741

    Adamo,

    to get you out of frustration on a sunny sunday morning: Try 60 for LRS and 97 for URS. D300s Samyang 8mm NN5.


    But check the setting with your own equipment with the links you know. Samyang only needs 4 for shots around. You should get familiar with the way to find the settings on your own as well

    Sucess,
    Heinz

    BTW.: One of the basic links: http://www.frankvanderpol.nl/fov_pan_calc_de.htm
    Last edited by hindenhaag; 11-21-2010 at 02:23 AM.
  5. #5
    Users Country Flag
    Join Date: Nov 2010
    Location: Cincinnati, OH
    Posts: 33

    Quote Originally Posted by badders View Post
    Looks like you are taking 6 shots around? You only need 4 shots around tilted down at -15degs plus one shot up tilted up at 60 degs for a full 360 x 180 with this lens and the D300. What software are you using to stitch? Are you telling it the correct initial lens parameters?
    No, I'm taking 5 shots around only, no Zenith. I'll try 4 shots at -15 plus zenith +60.
    Also, is the CP line running up/down above white screw supposed to indicate 97 on upper arm? Then I had correct setting there, but lower was set at 63. Is LRS indicated by left edge of a support arm? A little confused would be under statement.:001_unsure:
    Thank you all!
  6. #6
    Users Country Flag
    Join Date: Nov 2010
    Location: Cincinnati, OH
    Posts: 33

    Quote Originally Posted by Adamo View Post
    No, I'm taking 5 shots around only, no Zenith. I'll try 4 shots at -15 plus zenith +60.
    Also, is the CP line running up/down above white screw supposed to indicate 97 on upper arm? Then I had correct setting there, but lower was set at 63. Is LRS indicated by left edge of a support arm? A little confused would be under statement.:001_unsure:
    Thank you all!
    In addition what focal length is correct to use in autopano or PTGUI?
    The reviews I read claim a little bit different ones, like true FL i9s 8.7, 7.87, 8.5 etc.
  7. #7
    Users Country Flag
    Join Date: Nov 2010
    Location: Cincinnati, OH
    Posts: 33

    Here are two more images after correcting my setup to suggested settings. I think it's much better. 4 around at +15, 1 at +60 and 1 at -60.
    Attached Thumbnails Attached Thumbnails Click image for larger version

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ID:	119   Click image for larger version

Name:	NPP_still_trying.jpg
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ID:	120  
  8. #8
    Users Country Flag
    Join Date: Aug 2008
    Location: Netherlands
    Posts: 1,741

    Hi Adamo,

    The line on CP is indication the upper rail setting. 97 is right. But your thumbnail shows the teeth of the saw cut to the left, so you have to move to the left, which means you have to reduce the distance, it has to be set to something lower than 63: try 60 as I recommended.

    Focal length has to be set to 8mm. PTGui will determine it self after the first arrangement. Just came back home right now, so an answer being a little bit later, but better than no answer?

    Cheers,
    Heinz

    BTW: John answered as well while I was looking up my database. So Adamo, you see we are watching... Because of the special construction of the Samyang lens it is more a 9mm, and with a good stitch adding manual control points to the outside of the lens, corrected Chromatic Aberration and a very small crop, you get a FOV of around 190°.
    Last edited by hindenhaag; 11-21-2010 at 02:55 PM.
  9. #9

    PTGui evaluates the focal length of the Samyang 8mm to approximately 9mm, so it's best to initialize it to that.

    John
  10. #10
    Users Country Flag
    Join Date: Nov 2010
    Location: Cincinnati, OH
    Posts: 33

    John and Heinz,
    Thank you for helping me here. Close, but no cigar, so far
    I've already set LRS to 60 in the last images I attached. I shall try 59 today or tomorrow.
    Should I shot 4 around at -15, zenith at +60, nadir -60? Total 6? :001_unsure:
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