Swansea Astronomical Society Blog
Thursday, April 26, 2012
Drawings of M81 and M66
A Mintron frame-accumulating video camera was used as an electronic eyepiece at the prime focus of a 130mm f/5 Newtonian on an AZ GOTO mount.
Drawings were made of Two galaxies:
M81:
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Original drawing |
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Negative of original drawing |
M66:
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Original drawing |
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Negative of original drawing |
Chris Playle
Sunday, April 22, 2012
Mars and Saturn last night
A DBK21 camera was used with an 11" SCT to image Mars and Saturn.
Saturn was imaged using a x1.5 Barlow:
Mars was imaged using a x2.5 Barlow:
Mars's 0.93 phase is now easy to see.
Keith Davies
Afocal M13 with a compact camera
A Samsung WB800 camera was mounted with a 40mm eyepiece on a Practica Afocal mount and was attached to the focuser of a 10"/F4.8 Newtonian. The eyepiece was fitted with a light pollution filter. The camera was set to ISO 1600 (the maximum for this camera is ISO 3200) and 16s exposure (the maximum for the camera). 33 images of M13 were captured and 54 dark frames were captured.
The images were registered and stacked in Deep Sky Stacker with dark-frame correction.
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M13 Globular cluster |
More image sub frames would have yielded even better signal/noise ratios. However, this experiment demonstrates that afocal imaging with a compact camera can capture the brighter deep sky objects if the camera can be set to reasonably high ISO values and relatively long exposures.
Steve Wainwright
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