# Filters for solar eclipse and solar feature viewing

I have

and would like to outfit both with filters for solar eclipse viewing. I gather the basic setup simply involves finding an appropriate filter, that fits the equipment, but I'm new to this and the range of options is bewildering. Ideally I'd also like something that allows me to see solar features, but I gather that these can be quite expensive.

What are my options (or a good reference on options) for viewing solar eclipses and solar features? Would something like an "eyepiece" filter work on its own for safe viewing, or would my telescope require something different?

To prevent eye damage, a filter covering the objective (full aperture, energy rejection, safety film, etc.) is mandatory. An eyepiece filter also needs an objective filter to protect against overheating. Sunspots are visible without an expensive narrowband filter. A filter for the hydrogen-alpha (H$\alpha$) line or the calcium line you linked to can show more detail within the solar disk or prominences around the edge. Sky & Telescope has several articles about observing the Sun.