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Announcements

Announcements. Exam 2 is next time. Will cover light, telescopes & eyepieces. Formula sheet has been posted Second project list is posted. First come first serve so make your choice soon. Homework: Supplemental Problems. Telescopes are often referred to by their f-ratio.

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Announcements

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  1. Announcements • Exam 2 is next time. Will cover light, telescopes & eyepieces. Formula sheet has been posted • Second project list is posted. First come first serve so make your choice soon. • Homework: Supplemental Problems

  2. Telescopes are often referred to by their f-ratio f is the focal length of the telescope and d is its diameter For a CCD camera, the image scale SI (arcseconds per pixel) depends on the focal length of the telescope (in mm) and the dimension of the image pixels. m is the size of a single pixel in micrometers

  3. Examples I will do: If a focal reducer for a 10” Meade LX200 can change the f-ratio to f/6.3, what is the image scale for a CCD with 20 micron square pixels using that focal reducer? You do The telescope APSU has is a 19.5” f/6.8 Ritchey-Chretien telescope. What is the focal length of the telescope? The CCD camera we will use on the 19.5” RC has pixels that are 7.4 microns on a side. What is the image scale for this CCD?

  4. Example Solutions First, find the focal length of the telescope Now find the image scale Note that the appropriate unit conversions are all incorporated in the number 206.265 so long as the pixel size is in micrometers and the focal length is in millimeters

  5. Eyepieces come in a variety of different optical designs The magnification of a telescope is just the ratio of the focal length of the objective to the focal length of the eyepiece Since the light is passing through glass, eyepieces suffer from chromatic aberration

  6. Field of View depends on the eyepiece 60 ° fov 68 ° fov 82 ° fov

  7. Eyepiece Examples Determine the magnification and field of view of a 10” LX200 (f/10) when using a 21 mm Plossl eyepiece (FOV = 52°). Find the magnification and field of view of a 31mm Nagler eyepiece used on a 10” Newtonian reflector (f/4.7). What is the magnification and field of view of a 16 mm Panoptic eyepiece used on a 120 mm f/7.5 refractor?

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