Alt Azimuth mount VS Equatorial mount
AZ mounts are perfect for beginners, children and also for terrestrial viewing. Its simple mechanism makes it easy to use. Why it isn’t great for serious astronomers? In order to follow the rotation of the night sky (diurnal motion) at a constant rate, you need to rotate both axes individually, at different rates.
I’m a serious astronomer, but I like AZ mount. You can opt for GoTo telescopes. It uses computer to adjust the two axis and track an object, similar to what EQ mount can do and cheaper too.
EQ mounts are designed to follow the rotation of the sky. How does it work? One rotational axis is designed to be parallel to earth’s axis rotation. It moves slowly, at the same rate as the sky’s movement. Instead of a horizontal and a vertical axis, there are equatorial axis (right ascension) and a perpendicular axis for motion (declination). Usually, you’ll find the equatorial axis mount equipped with a motorized clock drive which rotates every 23 hours and 56 minutes in exact sync with the apparent diurnal motion of the sky.
Below is a diagram to show you how Alt Azimuth mount and Equatorial mount works
For astrophotography, you should definitely get equatorial mount. Considering the long exposure time for the camera, you’d need the tripod mount that follow the sky rotation. You might get blurry images without this mount.