- Using a telescope to photograph solar events requires a light filter
- A solar flare is a kind of solar event
- A solar prominence is a kind of solar event
- Hence, using a telescope to photograph a solar prominence and a solar flare requires a light filter

So, using a telescope to photograph a solar prominence and a solar flare requires a light filter
Q: What is necessary to use on a telescope in order to photograph solar flares and solar prominences?
Context:
- Using a telescope to photograph solar events requires a light filter 
- A solar flare is a kind of solar event 
- A solar prominence is a kind of solar event