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Small Refractor CCD Imaging - PowerPoint PPT Presentation

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Small Refractor CCD Imaging. David Haworth Agenda. Equipment Imaging session Image processing Advantages Disadvantages. Equipment. CCD Cookbook CB245 camera Orion ShortTube™ 80mm refractor 400mm Focal length 13 x 10 arc second/photosite

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Small refractor ccd imaging l.jpg

Small Refractor CCD Imaging

David Haworth

Agenda l.jpg

  • Equipment

  • Imaging session

  • Image processing

  • Advantages

  • Disadvantages

Equipment l.jpg

  • CCD Cookbook CB245 camera

  • Orion ShortTube™ 80mm refractor

    • 400mm Focal length

    • 13 x 10 arc second/photosite

  • Piggy back on Celestron CG-11 Schmidt-Cassegrain telescope

Ccd cookbook cb245 camera l.jpg
CCD Cookbook CB245 Camera

Interface to PC

Water Cooling

Spectra Astro Systems Shutter

Camera Head

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IR Filter to Reduce Focusing Problem


Santa Barbara

Instrument Group

IR Filter in

T-mount extension tube

Spectra Astro Systems Shutter

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Monitoring CCD Temperature





Typical  from water = 62°F

Spectra astro systems shutter l.jpg
Spectra Astro Systems Shutter

Shutter for Taking

Dark Frames

Ccd cookbook cb245 camera8 l.jpg
CCD Cookbook CB245 Camera

T-ring with

IR Filter

Spectra Astro

Systems Shutter

Ccd cookbook cb245 camera mounted on orion shorttube refractor l.jpg
CCD Cookbook CB245 Camera Mountedon Orion ShortTube Refractor

CCD Camera

T-ring Camera Support

Imaging session l.jpg
Imaging Session

  • On the driveway observing

  • Reducing setup & tear down time

  • Typical imaging session

  • Dark frames

  • Multiple images

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Ready for Night Time Imaging

Roll a way Table

With Dew Cover

Astro Trailer

CCD Cooling


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Cooling the CCD Camera

Water Thermometer

Open System Cooling Water

Water Pump (12VDC)

Image processing l.jpg
Image Processing

  • Richard Berry's software

    • Multi245: calibration & stacking

    • CB245: Kunihiko Okano's Digital Development functions

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Multi245: Stacking Multiple Images

One 15 Seconds Image 31 - 15 Seconds Images

Image processing23 l.jpg
Image Processing

  • Software Bisque CCDSoft CCD Astronomy software

    • Brightness & contrast adjustment, rotating image, resampling the image to correct aspect ratio and saving the image as a JPEG file

  • JASC Paint Shop Pro software

    • Image cropping & creating mosaics

Ccdsoft aspect ratio resampling m42 l.jpg
CCDSoft - Aspect Ratio ResamplingM42

242 x 252 187 x 252

Advantages l.jpg

  • Large field of view

    • 55 x 41 arc min. vs. CG-11 12 x 9 arc min.

    • Large object imaging

      • M8, M33, M42, M78, etc.

  • Finding objects is easier

  • Reduced polar alignment errors effects

  • Reduced tracking errors effects

Large field of view 41 x 55 arc min29 l.jpg
Large Field of View 41 x 55 arc min.

M81 & M82 Horsehead B33

Disadvantages l.jpg

  • Small objects do not image very well

    • M57, M72, M75, M76, etc.

  • Small 80mm aperture

Zoom in ngc7331 l.jpg
Zoom in NGC7331







Other images l.jpg
Other Images

  • 70 Messier objects

    • ITS ‘99 CD-ROM