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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

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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


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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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T-ring Camera Support


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Orion Piggy Back on Celestron CG-11


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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Telescope is Setup on a Dolly


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Telescope is Lifted on Blocks


Astro trailer l.jpg

Astro Trailer


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Computer Ready to Control the Camera


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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)


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Quick Disconnect Water Hoses


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 Image31 - 15 Seconds Images


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CB245: Kunihiko Okano's Digital Development M13

Without With


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


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CCDSoft - Aspect Ratio ResamplingM42

242 x 252 187 x 252


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Paint Shop Pro - Crop Star Blooming M37

Uncropped Cropped


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Paint Shop Pro - M31, M32 & M110 Mosaic

M32

M110


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 min l.jpg

Large Field of View 41 x 55 arc min.

M33 M78


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Large Field of View 41 x 55 arc min.

M81 & M82Horsehead B33


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M11 & Dark Nebulas


M8 m17 l.jpg

M8M17


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Disadvantages

  • Small objects do not image very well

    • M57, M72, M75, M76, etc.

  • Small 80mm aperture


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Small Objects do Not Image Very Well

M57 M76


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Small 80 mm Aperture NGC7331


Zoom in ngc7331 l.jpg

Zoom in NGC7331

14.7

?

16.9

15.2

14.5

10.3


Stsci digitized sky survey dss 48 inch ngc7331 l.jpg

STScI Digitized Sky Survey (DSS) 48-inch NGC7331

?


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Other Images

  • 70 Messier objects

    • ITS ‘99 CD-ROM

    • http://www.stargazing.net/david


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