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Thanks everyone :-)
When I was referring to PI's annotation software I was really referring to its plate solving. Here's the actual output. I didn't notice the reported focal length until I went to generate this to output it, only the reported resolution.
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Referentiation Matrix (Gnomonic projection = Matrix * Coords[x,y]):
+5.82724e-05 +0.000197098 -0.142898
+0.000197143 -5.82725e-05 -0.106898
+0 +0 +1
Projection origin.. [695.733791 519.313793]pix -> [RA:+23 18 52.74 Dec:-42 18 49.79]
Resolution ........ 0.740 arcsec/pix
Rotation .......... 73.537 deg (flipped)
Focal ............. 1797.87 mm
Pixel size ........ 6.45 um
Field of view ..... 17' 9.3" x 12' 48.9"
Image center ...... RA: 23 18 52.746 Dec: -42 18 50.00
Image bounds:
top-left ....... RA: 23 18 06.281 Dec: -42 25 14.04
top-right ...... RA: 23 18 32.720 Dec: -42 08 47.30
bottom-left .... RA: 23 19 12.878 Dec: -42 28 52.47
bottom-right ... RA: 23 19 39.053 Dec: -42 12 24.79
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