Settings for Canon 450D (Rebel XSi) with Opteka 6.5mm fisheye (Samyang 8mm) [Archive] - Nodal Ninja Forum

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VinkoCM
11-13-2010, 06:19 PM
Hello there,

Does anybody know the rail settings for the NN3 with a Canon Rebel XSi (450D) and the Samyang 8mm fisheye lens (Opteka 6.5mm)? I have 9.65mm for the upper arm and 5.5mm for the lower arm, but I am not able to get very good stiches. Do these settings sound ok? Note: the settings include the camara mounting plate and the rail plate that come with the MKII.

Vinko

nick fan
11-13-2010, 06:37 PM
follow the tutorial to check the accuracy of the settings.
http://www.johnhpanos.com/epcalib.htm

nick

hindenhaag
11-13-2010, 11:25 PM
Vinko,

use this to check your lower rail setting: http://www.easypano.com/forum/display_topic_threads.asp?ForumID=1&TopicID=4162

Heinz

VinkoCM
11-14-2010, 05:45 PM
Hi Nick. I have been using John's method, but was not able to zero in on the correct settings. That is why I was wondering if anybody else had the settings.

Thanks Heinz for the link. Using the method in the link I was able to find the best rail setting for the lower rail (5.275 cm). It worked great and was very easy.

Thanks.

hindenhaag
11-14-2010, 09:21 PM
Have a look at this:

http://michel.thoby.free.fr/Fisheye_history_short/Beyond-the-pupil.html

http://michel.thoby.free.fr/SAMYANG/Early%20test%20report.html

Heinz

hindenhaag
11-14-2010, 09:39 PM
Deleted. Was test for Derek /IT

John Houghton
11-14-2010, 11:52 PM
Hi Nick. I have been using John's method, but was not able to zero in on the correct settings.
I would be interested to hear which of the methods I describe you had trouble with and what exactly went wrong.

John

hindenhaag
11-15-2010, 12:35 AM
Hi John,
also an early morning bird....

Yes, that would be nice to know. Cause I think with all the methods you describe it should end up in a good final result. But may be he had problems because o the samyang special lens design, which result in NPP very close together compared to other lenses.

Regards,
Heinz

BTW: http://pt4pano.com/de/blog/nodalpunkt-npp-oder-lpp

Though it is in german, the lists might be helpful.

John Houghton
11-15-2010, 09:05 AM
But may be he had problems because o the samyang special lens design, which result in NPP very close together compared to other lenses.
Heinz, I'm not sure what you mean by that. The Samyang behaves much like any other lens when determining the NPP. I found it perfectly straightforward.

John

hindenhaag
11-15-2010, 09:57 AM
John, I was referring to this list:

Winkelabhängigkeit der NPP-Position für einige beliebte Panorama-Fisheyes

30° 40° 50° 60° 70° 80° 90°
Sigma 3,5/8mm
-1,0mm -0,5mm +0,5mm +2,5mm
+5,0mm +7,5mm +11mm
Sigma 2,8/10mm
-1,0mm -0,5mm +0,5mm +1,5mm +2,5mm +4,0mm
-
Nikkor 2,8/8mm -1,0mm
-0,5mm
+0,5mm
+2,5mm
+4,5mm
+6,5mm +9,5mm
Samyang 3,5/8mm -1,0mm
-0,5mm
+0,5mm
+1,0mm
+2,0mm
+3,0mm +4,5mm
Sony NEX ECF1 -2,7mm
-1,0mm
+0,7mm
+2,0mm
- - -
Lumix 3,5/8mm -1,5mm
-0,6mm
+0,8mm
+2,0mm in the link below.

Heinz

John Houghton
11-15-2010, 10:15 AM
Heinz, I see what you mean. The variation of the NPP with angle of incidence is indeed smaller for the Samyang, as compared to the Sigma 8mm, for example. But that tends to make things easier rather than more difficult. For a rectilinear lens there is often no variation at all, so it is then not important to set the head for minimum change in the entrance pupil position only at the angles the panorama shots will be taken at.

John

VinkoCM
11-16-2010, 06:26 PM
Hi John. When I calibrated my previous lens, I followed your explanations and I had no problem at all. It was a Canon 18-55mm lens. I don't think my problem had anything to do with your explanations and tutorial.

Because I could not get a good stitch, I restarted from zero. I dismantled everything and started from scratch and everything worked fine. Maybe the camera mounting plate twisted or shifted.