What telescope to watch the sun?

What is the best telescope to watch the sun? There are filters that can be attached to a conventional telescope to target our star. However, this can be dangerous if the filter is removed. You can always project the image onto a sheet of paper or add a webcam or a camera to the eyepiece. But the device can also suffer damage if the filter has a problem. It is thus preferable to opt for a telescope dedicated to the observation of the sun, especially knowing that the definition will be much better compared to a standard telescope with a simple filter.

4 – Coronado solar telescope SolarMaxII 60 / BF10. Opening: 60 mm; Focal length: 400mm; F / d ratio: f / 6.6. Maximum useful magnification: 120. Light collecting power: 70. Bandwidth: 0.7 AE.

3 – Coronado SolarMaxII Solar Telescope 90 / BF15. Opening: 90mm; Focal length: 800mm; F / d ratio: f / 8.8. Maximum useful magnification: 180. Bandwidth: 0.7 AE.

2 – Coronado ST 40/400 PST solar telescope. Opening: 40mm; Focal length: 400mm; F / d ratio: f / 10. Maximum useful magnification: 80; Light collecting power: 30. Bandwidth: 0.5 A handset.

1 – SolarMaxII BF30 Coronado 90 solar telescope. Opening: 90mm; Focal length 800 mm. F / d ratio: f / 8.8. Maximum useful magnification: 180. Bandwidth: 0.5 A handset.

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