With long days and shorter nights, summer is a good time to consider getting into solar astrophotography. The Sun is also heading toward the active phase of its 11-year sunspot cycle and promises to make the Sun more interesting than the featureless cueball look of the sunspot cycle minimum. Solar astronomers use the count of visible sunspots as a measure of the solar activity, and sunspot cycle #25, as counted by astronomers, looks like it will be peaking sometime around 2024.
One of the biggest confusions that you might notice as you venture into astrophotography is that photographers and astronomers measure their equipment differently. Photographers tend to refer to their lenses in terms of their focal length, while astronomers refer to their telescopes by the diameter of their opening. Thus, a 75mm f/6 telescope has a focal length of 450mm. Meanwhile, a 75mm camera lens at f/6 has an aperture of 12.5mm. If a photographer is told that someone is shooting a 155mm lens hand-held, it would not raise an eyebrow, but an astronomer told the same thing would be incredulous! I can only barely lift my 155mm telescope onto its mount!
