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Object Information
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Name: |
M45, The Pleiades, or Seven Sisters |
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Type: |
Star Cluster with Nebulosity. |
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Description: |
M45 (the Pleiades) is a very bright star cluster that can be seen easily by the human eye as a
bright patch in the sky. Its beautiful to look at with binoculars and is a
winter time favorite. This picture was taken with a Nikon D70 and a 600mm f4
ED lens. |
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Magnitude: |
1.2 |
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Size: |
100.0 x 100.0 arcminutes |
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Related Photos: |
none |
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References: |
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| Acquisition
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Location: |
Latitude 44.841N by
Longitude -122.869W at an elevation of 87 meters.
Aumsville, Oregon USA |
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Date: |
September 12, 2008 |
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Zone: |
-8 (Pacific Standard Time) |
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Equipment
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Imager: |
Nikon D70 |
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OTA: |
Nikkor 600mm f4 ED super telephoto lens |
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Barlow: |
none |
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Platform: |
2X Super Modified Nikon Imaging Platform |
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Guiding: |
Orion StarShoot DSCI II, Nikkor 300mm f2.8 ED lens, and MaxIm DL Essentials. |
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Imaging
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Mode: |
Mode 2 |
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White Balance: |
Sunlight |
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Color
Space: |
sRGB |
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Format: |
RAW (3008 x 2000) |
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Light
frames: |
8 x (5 Min @ ISO 200) |
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Darks: |
none |
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Flats: |
none |
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Filters: |
Nikon 39mm UV/IR |
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Mask: |
none |
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f-stops: |
f4 |
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FOV: |
136 x 89 arcminutes |
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Scale: |
2.71 arcseconds per pixel |
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Software: |
Nikon Capture 4 Control |
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Image Processing
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Stacking: |
Deep Sky Stacker 3.2.1 |
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Combined: |
Average |
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Processing: |
PhotoShop CS3, Astronomy Tools CS2 V1.5, New Astro Zone System, Noiseware Professional Plugin. |
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Notes
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Stars away from the optical axis show significant flare.
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While the Nikon 600mm ED Lens is a high quality lens; all lenses of this
size are have aberrations like this especially when at full aperture.
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One way of removing aberrations is to stop the lens down at least by two
steps; however, on bright stars this will produce very large refraction
spikes.
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