https://www.facebook.com/photo/?fbid=10161168532861043&set=gm.407676195507641&idorvanity=380858261522768FoV of the D2(light blue) and D3(darker blue) for comparison, sensors have the same physical resolution in terms of pixels but the IMX678 has 2micron cells.
D2 IMAX415 1.45um
D3 1/1.8 IMX678 pixel size 2um 8.40M有效畫素 FOV 比 D2 小一點點
Seestar s50 IMAX462 2.9um
imx678 1/1.8" crop_factor 4.8 , imx415 crop_factor 6.6 , so focus maybe 135~ 150mm ? if F=4 , diameter 37.5mm ??