What is the real resolution of XPhase? DSLR shooters want to know in order to compare to the panoramas they currently shoot. Is the resolution really higher? I found the answer using PTGui.
XPhase (reviewed here) is the highest resolution 360 camera as of August 2019. XPhase claims a resolution of 200mp because it has 25 sensors that are 8mp each. But the stitched resolution is only 16,384 x 8,192 (134mp). Meanwhile, the Panono also has a stitched resolution of 16,384 x 8,192 but they only claim a resolution of 108mp because it has 36 sensors that are 3mp each. If you argue that the stitched resolution is the true resolution, then Panono and XPhase have the same nominal resolution, even though XPhase is actually much more detailed. You can use the 360 camera comparison tool here or watch my comparison video.
On the other hand, while the unstitched photos do have 200mp in total, some of those pixels are redundant because some overlap is necessary for stitching.
To avoid confusion, I decided to find the resolution of the XPhase using PTGui, one of the most popular stitching software used by DSLR panographers. Using PTGui to stitch XPhase photos, the resolution I get is: 17,490 x 8,745 (around 153mp):
Therefore, based on PTGui’s calculated resolution, the XPhase is actually more detailed than its stitched resolution of 134mp. If you want to stitch with PTGui, here are instructions and a stitching template. Please note, however, that I found XPhase stitching to work much better than PTGui for stitching XPhase photos.
By comparison, when I stitch a panorama shot on the Sony a6000 (24mp APS-C) with a Samyang 8 2.8 (diagonal fisheye on APS-C), the stitched resolution in PTGui is 13484 x 6742 (91mp). And indeed, in my comparison, I found the XPhase to have significantly more detail than the Sony a6000 / Samyang 8mm f/2.8 combination.