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Astrotracer Using a 300mm Lens, 



    
        

            AlenK

Astrotracer Using a 300mm Lens

Astrotracer Using a 300mm Lens, 



    
        

            AlenK

Astrotracer Using a 300mm Lens

Description

This is how I shoot with Astrotracer, a sidereal tracking function internal to the camera, in this case using an SMC Takumar 300mm f/4 lens. That lens has a collar that attaches to the tripod, an old Mamiya 1507 with a three-way adjustable head. The camera is a Pentax K-3II APS-C DSLR.

I normally actuate the shutter using an IR remote or a wired intervalometer. The latter allows multiple exposures in a row, with the number depending on the focal length I am using. Every few exposures (the frequency depending again on focal length) I re-center the target in the camera's field of view by adjusting the tripod head's azimuth and altitude release knobs. Less frequently, I also adjust the rotation of the camera using the tripod head's other knob to counteract rotation of the field. (Note that there is no rotation of the field in each Astrotracer exposure, only between images.)

It's all a very manual process but suffering for one's art is a time-honored tradition. :D

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Astrotracer Using a 300mm Lens, 



    
        

            AlenK