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Small Refractor CCD Imaging. David Haworth http://www.stargazing.net/david/. 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

http://www.stargazing.net/david/


Agenda l.jpg
Agenda

  • Equipment

  • Imaging session

  • Image processing

  • Advantages

  • Disadvantages


Equipment l.jpg
Equipment

  • 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


Ir filter to reduce focusing problem l.jpg
IR Filter to Reduce Focusing Problem

CCD IC

Santa Barbara

Instrument Group

IR Filter in

T-mount extension tube

Spectra Astro Systems Shutter


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Monitoring CCD Temperature

CCD IC

Thermistor

mounted

on CCD IC

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




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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

Water


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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



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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


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CCDSoft - Aspect Ratio ResamplingM42

242 x 252 187 x 252




Advantages l.jpg
Advantages

  • 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
Disadvantages

  • Small objects do not image very well

    • M57, M72, M75, M76, etc.

  • Small 80mm aperture




Zoom in ngc7331 l.jpg
Zoom in NGC7331

14.7

?

16.9

15.2

14.5

10.3



Other images l.jpg
Other Images

  • 70 Messier objects

    • ITS ‘99 CD-ROM

    • http://www.stargazing.net/david


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