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Two Crescents - 01 Dec

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Author Topic: Two Crescents - 01 Dec  (Read 188 times)
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« on: December 04, 2010, 12:53:15 pm »

What is the difference in image scale between the 21 & 41 not allowing for the pixel pitch of the 2 cameras?
The DMK21 has 5.6 um pixel pitch, the DMK41 has 4.65 um pixel pitch.

WO FLT 110 focal length is 770 mm.

With x2 Powermate, 1540 mm: DMK41 image scale is 0.617861 arc sec per pixel

With x2.5 Powermate, 1925 mm: DMK21 image scale is 0.595273 arc sec per pixel

Or if you prefer 2.5 / 2.0 is approximately equal to 5.6 / 4.65

The image scale with DMK41 & 2x Powermate is very nearly the same as the image scale with DMK21 and 2.5x Powermate.
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