In search for which camera to choose for gigapixels: Crop with less gigapixels? or Full Frame with more gigapixels? I made a simple comparison table where pixels per degree are calculated:
|crop factor||angle in degrees|
|300mm 1.5x (APC Nikon)||1.5||3.1|
|300mm 1.6x (APC Canon)||1.6||2.9|
|300mm 1x (FF)||1||4.6|
Assume, we have 300mm lens and portrait orientation of camera:
|Camera||Megapixels||image width in pixels||crop||angle in degrees||pixels in 1 degree||Number of images required to cover 360 (with 0 overlap)||Equatorial 360 panorama’s width in pixels|
|Canon 7d mkII||24||3648||1.6||2.9||1258||124||452855|
|Canon 5d mkIII||22||3840||1||4.6||835||78||300522|
|Canon 5ds r||50||5792||1||4.6||1259||78||453287|
These number doesn’t take into account diffraction which can be a practical issue.
Sony APS-C cameras with 24Mpix should be treated similar to Nikon D7200.
More pixels in degree – better. FF is better than APC-S (requires less images). So for me the winner is Canon 5ds r – it allows to achieve almost the same pixel density as other cameras but you can get the same gigapixel with less images – which will mean less overlaps, less space on a card and computer required, faster shooting/stitching..