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Messier 45, Pleiades open cluster

Messier 45 with O-GPS1 and Sigma APO DG 300/2.8 - stack of 32 images x 20sec (eq. to 640sec exposure), 300mm/f2.8, 1600ISO

No equatorial mount !!!! just a standard tripod and a O-GPS1 unit on a Pentax K-5 IIs DSLR

No dark, no flat field, no offset ! Just lens corrections with Lightroom and some fine tonal curve

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Uploaded on October 28, 2014