Cygnus On A Tripod

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Cygnus on a tripod
Taken by Ron on October 6, 2015 @ Tampa Florida

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Thought I would see if it was possible to shoot the constellation Cygnus from a stationary tripod. Canon T4i kit lens set at 28mm, 5 seconds x 41 frames ISO 800, stacked in DSS

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Comments

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I do this regularly and there is a formula for determining exposure length when not using a clock motor drive.
Its focal length of normal lens divided by the lens you are using times 10 = maximum exposure time in seconds.
A normal lens was about 50mm.
This formula is old, before the digital camera age, so I am not sure about digital camera crop factor changing the numbers.
Something to maybe use for trial and error.

Posted by orbital1 2015-10-13 15:44:17

The 500 rule: max. exposition without startrails in seconds is the result of dividing 500 by the focal lenght (FL) of the objective. Valid for full frame (FF) camera and mid to high declination stars (e.g. Cygnus). For a non FF camera, multiply the crop factor (Nikon DX=1,5; Fourthids=2; etc.) by the FL of the lens.
Example: the max. exposition time for a 50mm FF lens is 500/50=10 seconds. If is a 50mm DX lens (1,5 crop factor), 50x1,5=75; 500/75=6,6 seconds.
For a low declination star, like Orion belt or so, use 400 instead of 500 to ensure pinpoint results.
Easy!

flickr.com/eirexas

Posted by eirexas 2015-10-13 19:14:25

SORRY guys I didnt mean to mislead but I made a mistake on the numbers,one of those senior moments.

That should read 41 x 15 seconds. This kind of imaging is fairly new to me and I enjoy the experimenting.

Thanks for the info and help

Posted by Ron 2015-10-14 05:02:00

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