Wednesday, January 27, 2016



Precision Focusing Tools for Astrophotography

Home Made Bahtinov Focusing Mask & Templates

Hartmann Mask on a camera lens

The Hartmann Mask

1. Image is extremely out of focus. 
2. Image is brought closer to focus. 
3. Image is almost focused. 
4. Image is now focused. 
5. The image has now been gone past perfect focus and will have to be brought back in focus by adjusting the focuser in the opposite direction. 
6. The image is back in focus. At this stage the image needs to be zoomed in to to check this is really the best focus you can get. The star points should be small and have the small peaks of the triangle just appearing at the dots three corners 

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