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Astrophotography is Fun!. Astrophotography. Amy Eisin, with pictures by club members February 25, 2002. Overview. Camera Hardware Film Exposures Lens Telescope. Camera Hardware. Manual vs. Automatic T-ring (goes on camera) T-mount (telescope adapter)

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Astrophotography is Fun!


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astrophotography

Astrophotography

Amy Eisin,

with pictures by club members

February 25, 2002

overview
Overview
  • Camera Hardware
  • Film
  • Exposures
  • Lens
  • Telescope
camera hardware
Camera Hardware
  • Manual vs. Automatic
  • T-ring (goes on camera)
  • T-mount (telescope adapter)
  • ISO exposure settings, cable release
  • Size of film 35mm, Medium Format
slide5
Film
  • 35mm negative
  • 35mm slide
  • Color
  • Black and White
  • ISO rated speed
  • “Push” processing
exposures
Exposures
  • Final image depends on film speed, focal ratio, and exposure time
  • Film speed
    • Higher ISO numbers give brighter images
  • Focal ratio
    • Lower “f” numbers give brighter images
    • f/5 is brighter than f/10
  • Exposure time
    • Longer exposures give brighter images
film differences
Film Differences
  • Color reproduction
  • Grain
  • Sensitivity
  • 4 M42 shots, different films, exposures
film grain
Film Grain
  • Film has inherent “grain” to it
  • Faster films (higher ISO) are usually grainier
  • Pushing film makes it grainier, sometimes much grainier
camera lens
Camera Lens
  • Lens aperture
  • Focal ratio
  • Focal length + image scale
  • Lens hood, prevent reflections
photography methods
Photography methods
  • Tripod
  • Barn Door (poor man’s clock drive)
  • Piggyback
  • Afocal (camera lens on camera focused at infinity, held near telescope eyepiece)
  • Prime focus (with telescope)
  • Eyepiece Projection (high magnification, for planets, very hard)
tripod photos
Tripod Photos
  • Max exposure of 20 seconds before stars trail on a typical lens (not zoom)
  • Moon shot, right before sunrise, from Haleakala volcano, Maui
  • 1 sec exposure
piggyback orion photos
Piggyback Orion Photos
  • Exposure times:
    • Kodak E200 film, pushed 2 stops
    • 30 sec (below)
    • 120 sec (right)
    • 150 sec (bottom right)
  • Light pollution sucks!
mounting the camera on a telescope
Mounting the Camera on a Telescope
  • Duct Tape (Joke!)
  • Piggyback adapter
  • T-Ring / T-mount
  • Eyepiece Projection adapter
telescope
Telescope
  • Clock drive
  • Polar alignment (guiding)
  • Focal ratio (ISO speed, etc)
  • Magnification and atmospheric conditions (seeing)
vibration polar misalignment
Vibration, Polar Misalignment
  • Polar misalignment, wind, vibrations, even footsteps can ruin your images
  • Take lots of pictures!
prime focus moon shots
Prime Focus Moon Shots
  • Eclipse (top right)
  • Varying exposures (bottom)
  • Enlargement of brightest of the three (bottom right)
prime focus m42
Prime Focus M42
  • 8” SCT at f/10
  • Kodak E200 film pushed 2 stops (800 ISO equiv)
  • Exposure time: 40 seconds
summary
Summary
  • You can do a lot with just a camera and a tripod
  • There are many great web sites and books on the astrophotography
  • Michael Covington’s book, “Astrophotography for the Amateur” is a great starting point