Presentation on theme: "Wide Field Imaging Not really a novice RV lifestyle forced change in 2009 Light weight and portable equipment Ideal for wide field imaging with camera."— Presentation transcript:
Wide Field Imaging Not really a novice RV lifestyle forced change in 2009 Light weight and portable equipment Ideal for wide field imaging with camera lenses Technique provides a good place to start imaging Slides are on www.geoandpat.com
First, Why Do I Image? Images provide more detail than visual Allows for more thorough study Color!
Transition from Visual to Imaging Often start with visual equipment (I did) – SCT f/10 (long focal length) – Difficult place to start Very small image scale (~0.5 arcsec/pixel) Very narrow field of view Focus always an issue with an SCT Long focal length requires long exposures May require guiding for good results
Image Scale, a Key Concept From New Astronomy Press CCD Calculator (Ron Wodaski) Difficult Good place to start Image scale = (207 x pixel size)/focal length Wide field minimum
Advantages of Wide Field Imaging No telescope, use camera lenses Low cost mount with RA tracking Image scale is very large (5-50) – Polar alignment still important – Tracking less critical, no guiding Very wide field of view Very portable AstroTrac
18mm Lens Image Many more images at www.geoandpat.com
My Imaging Equipment Canon XSi – Relatively inexpensive – Large sensor (12 MP) – Can use for terrestrial photography – Good color – Can be modified AstroTrac mount and pier – Light weight (19 lbs) – Quick and easy to setup (15-30 min).
My Imaging Process Laptop computer – Camera control (Images Plus) – Camera focus (Images Plus) Camera aiming – Red dot sight – Green laser Exposures usually 3min x 15-20 RAW; 5 darks; usually no flats or bias frames
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