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Total Lunar Eclipse. March 2007 Simon Dawes CMHAS. Site. Sex. Hya. P1 20:18:11 UT U1 21:30:22 UT. 19:48 – 22:35. Thought you would get away without some maths…. Why are the Images so poor?. Dawes Limit of Camera Lens = 2.4” Moon angular size ~ 1800” Therefore 1800/2.4 = 750

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total lunar eclipse

Total Lunar Eclipse

March 2007Simon Dawes CMHAS

slide2
Site

Sex

Hya

www.itslifejim.btinternet.co.uk

p1 20 18 11 ut u1 21 30 22 ut
P1 20:18:11 UTU1 21:30:22 UT

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19 48 22 35
19:48 – 22:35

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why are the images so poor
Why are the Images so poor?
  • Dawes Limit of Camera Lens = 2.4”
  • Moon angular size ~ 1800”
  • Therefore 1800/2.4 = 750
  • Double sampling = 1500 pixels
  • So I should be able to support a Lunar image of 1500x1500 pixels…

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however
However…

23 Pixels

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therefore
Therefore…
  • The image is smeared out by the lack of tracking and seeing conditions(px res = 2”, 2s exp = 30arc” = 15 px)
  • 1500/15 = 100 Pixels
  • So an Image 100x100 pixels should be enough to capture all the information…

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slide11

800 pixels

100 pixels

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original 800x800
Original 800x800

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800x800 recovered from 100x100
800x800 recovered from 100x100

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conclusions
Conclusions
  • The maths does describe the optical performance quite well.
  • To take decent images of the moon at the maximum resolution you do need to track the sky.
  • I need a dew heater!
  • To create high quality time lapse video you need to take images more regularly than every ten minutes for a lunar Eclipse (estimate every minute)

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thank you
Thank You

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