A quick way to calculate a 360×180° panorama pixel count

No matter what, a full spherical panorama follows the ratio of 2:1 

360:180° degrees, 10000:5000 pixels…

In most un-motorized panorama captures the camera is mounted in vertical position
1-determine the long size of the sensor in pixels of the camera being used (HC)

singlerow_panoramic multirow_panoramic

2 –Search for the horizontal FOV (field of view) of the lens being used (HL)

3- Divide 180 by (HL) the Horizontal FOV to get a ratio (R)

4-multiply this ratio (R) by the horizontal size of sensor in pixels. This will give vertical pixel count. (R )*( HC)= (VP)*crop factor (if using a crop sensor multiply by the crop factor, a full frame’s crop factor is 1)

5-multiply the vertical pixel count by 2 to have the horizontal pixel count (HP)=(VP)*2

6-multiply (HP)*(VP)/1.000.000 et Voila! your 360×180 panorama in megapixels

A quick example, a Fisheye 16 Nikkor mounted on a d800:

(HC) = 7360 pixels (D800 is H 7360 x V 4912 pixels)(HL) = 137° (Fisheye 16mm is H 137° V 88°)
(R) = 180°/137° =1.313
(VP) = (R)*(HC)*1 (crop factor full frame) =1.313*7360 = 9670 pixels
(HP) = 2*(VP) = 2 * 9670 = 19340 pixels
(HP)*(VP)=19340×9670=187,017,800 pixels = 187 Mega Pixels

Another example, a D7100 with a 18-55 lens @ 18mm

(HC)= 6000 pixels (D7100 is H 6000 x V 4000 pixels)
(HL)= 86.73° (a full frame 18mm lens is H 86.73° V 67.38°)
(R) = 180°/86.73° = 2.075
(VP) = (R)*(HC)* Crop Factor = 2.075x6000x1.5 =12,452 x1.5 = 18,678 pixels
(HP) = 2*(VP) = 2*18,678 =37,356 pixels
(HP)*(VP) =37,356×18,678 =697,735,368 = 697.74 Megapixel = 0,7 Gigapixels
(for the d7100,18-55 combo we need V 3 * H 12 = 36 photos to make a full sphere, a bit unpractical for inexperienced, even on a multi-row panoramic head)

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