Observing the sun requires a special type of protective filter called a solar filter. Such filters work by passing sunlight through specialized layer of metal, placed in between layers of glass or plastic film. Solar filters block more than 99.99% of sunlight, and must be placed on top of the telescope’s objective (on the main aperture of the telescope) to reduce the sunlight’s intensity before it gets focused by the telescope. Without a solar filter, sunlight’s intensity will be high enough to cause loss of vision and damage to equipment.


Observing and imaging the sun require a solar filter

To learn how to construct a mounting frame (also called a filter cell) for a solar filter, which will help protect the delicate film and allow safe viewing (and imaging) of the sun, click here.

For featured photos, click here.
For tutorials on how to get started with astrophotography, click here.
For DIY astronomy projects useful for astrophotography, click here.
To subscribe to this site, click here.

© Anthony Urbano (Manila, Philippines)