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Startrail Dots

© Lyndel Reese

Startrail Dots

Uploaded: October 07, 2002

Description

Has anyone seen this efect before?

Comments

Jeff L. Pitt October 07, 2002

I have,
It is an awesome effect. The earth's rotating on its axis will blur the stationary stars if you leave the shutter open for long enough. In order to get a really strong effect you need to leave the shutter open for several hours. #10312

Arthur Rosch May 26, 2019

Lyndel, you may have double exposed.
The dots are stars from a short exposure. then you used the same frame
to make your long trails shot. so the
dots connected with the trails so that
each trail had a 'head' on it.

Art rosch
www.artsdigitalphoto.com #48686

Arthur Rosch May 26, 2019

Lyndel, you may have double exposed.
The dots are stars from a short exposure. then you used the same frame
to make your long trails shot. so the
dots connected with the trails so that
each trail had a 'head' on it.

Art rosch
www.artsdigitalphoto.com #48687

Lyndel Reese May 26, 2019

Art
Thanks for the reply.
However this is not a trick. I was going for prefect dots and gas clouds, in the Milky Way by trying to track the stars.
I was using a 645 Pentax w/75mm lens wide open on a motor driven double barn door drive. I bracketed with length of exposure for 7-1/2, 15 and 30 minutes. All three exposures have the same effect but with longer tails in each respectively. This tells me the drive was running consistently in all three shots.
This fact convinces me the drive was not running a 1 rpm but slightly slower.
The discrepancy in rpm’s caused the tails because the drive was loosing a little more ground for each minute it was running. However the slightly slower speed it was rotating at caused the last portion of the exposure to be close enough to have the pinpoint stars I was going for in the first place.

Still looking for answers
Gene
#102203


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