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Astronomy projects
DIY star tracking
To take photo's of the stars even modern digital camera's require exposure times from 10's of seconds to a few minutes or more. However any exposure over a few seconds, especially with a telephoto lens, will show 'star trails' (caused by the stars 'smearing' as the Earth turns). To take 'pin sharp' photo's requires a camera mount that counteracts the movement of the Earth. One such (that can be constructed using basic wood-working skills) is the 'Barn Door' or 'Haig Mount' and is described here.
Although the basic Barn Door mount can be 'driven' by hand, I also describe how a simple electro-mechanical drive can be constructed without the need for any complex electronics. To minimise battery usage, I then finish up with a more complex PWM driven system
The pages in this topic are :-
+ notes
Barn Door - (basic principles)
+ Fabrication - (calculations)
+ Building a Barndoor - (Haig mount)
+ Manual operation
+ Better NCP - (alignment)
+ Basic electrics - (relay drive)
+ Electronic drive - (principles)
+ Stepper motor drive
+ Astroimaging - (with the Barndoor) == Latest changes (modified 18th Jun 2020 18:20.)
Star tracking - (AutoTracking)
+ Introduction to autotracking
+ Basic motor control
+ Gearing and control
+ PWM motor control
+ Retrofitting in practice
+ Telescope remote control
+ The actual map fixes - (whats changed in x3)
Astrophotograpy - (Index)
+ History of digital astro imaging
+ Setting up your telescope
+ Using filters
+ Field of view
+ Using your Camera - (Canon DSLR)
+ Imaging the moon
+ The what and why of RAW
+ Defective pixels - (what are they)
+ Astro image processing
Links to Astrophotography software
Astronomy Projects
+ Astronomy SQM - (Sky Quality Meter)
Links to Astrophotography software
Next subject :- Barn Door - (basic principles)
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