R1 NPP Setting for Sigma 8mm F3.5 Canon and Nikon

[nick fan]

I have find some time to determine the optimal setting for Sigma 8mm F3.5 Canon and Nikon on R1.
Here is a table to show the settings.
https://fanotec-public.s3.amazonaws.com/R1%20NPP%20for%20Sigma%208mm%20F3.5%20Canon%20and% 20Nikon.pdf

I would appreciate if users can test the validity by making a pano using my value(s).
I will make integrated rail plate for selected tilt angles. I will give 10 free copies for responders (one each) of each mount. $10 in value.

Nick

[John Houghton]

Nick, I think there is an error in the figure given for Nikon 0 degrees, 4 shots around. 3.8 should probably be 2.8 as the Canon and Nikon figures ought to differ by 0.6 (approx) throughout.
.
John

[nick fan]

Nick, I think there is an error in the figure given for Nikon 0 degrees, 4 shots around. 3.8 should probably be 2.8 as the Canon and Nikon figures ought to differ by 0.6 (approx) throughout.
.
John


Hi John,

Thx for the input. The sigma 8mm for nikon uses LRP45X which extends 1cm to the back. So extra value of "1" is added compared to other LRPs. This plate is used for Tokina 10-17mm if you still keep it.

Nick

[John Houghton]

Nick, I don't understand your repsonse. I was simply saying that the Nikon figures should be Canon + 0.6. The figure given for Nikon 0 degrees, 4 around is 3.8, whereas it would be expected to be 2.8 on this basis.
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John

[nick fan]

opps, you are right. I probably made a mistake in data logging. I will double check.

what a coincidence with LRP45X difference.

Nick

[ThomasKrueger.eu]

Are the values for Nikon now correct in the linked table of the first post?

[spiritburner]

Nick, are the values for Canon still ok, I am using it on a 5d mk11, I have been off sick for a while with damamged knees and have not had much time to play but tomorrow i am off for a few days and want to play panoramas, I will try and do a few while I am in Andorra and see how they compare to my measurements that i currently use.

cheers

Neil

[nick fan]

NPP values are "correct" according to my tests.

Nick

[DennisS]

What I have found is that the setting depends on where in the image you want to opimize. Removing parallax from the center is a different setting than removing parallax from the top or bottom of the image. Since most of the stuff I shoot with the Sigma 8mm lens is outdoors where there are no features close up I optimize for the bottom. This provides a cleaner Nadir stitch. The number in your chart for the Nikon version tilted up 5 degrees is spot on.

I had one of the first generation R1 heads with the .25 error. That drove me nuts until I figured it out.

[mattock imagery]

Can verify npp value setting (1.55) for 4 shots @ +5 on Canon FFS is spot on! Thanks for posting Nick!