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Whether you're new to astronomy or an experienced observer
Housing Plastic housing
and nebulae show more structure
2 mm/3 inches
Field Flattener f/5 to f/7 firstlight Whether you're new to astronomyWhen doing astrophotography with refractor type telescopes, the faster the focal ratio the more field curvature becomes a problem. Field curvature will appear in the corners of astrophotographs, making the stars smear perpendicular to the axis of the image. This is called coma coma is Latin for comet, because the stars look like comets. The more the curvature, the closer to the center the coma appears. The larger the sensor, the worse the coma.
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