Knowing your astrophotography setup's pixel scale will help you take better pictures. And to determine pixel scale, you first need to know your field of view.
The post Framing Your Astro Images: Understanding Field of View and Pixel Scale appeared first on Sky & Telescope.
The OPT Triad Tri-band narrowband filter is designed to pass wavelengths centered at 493 and 656.3 nanometers and is available in 1¼-inch and 2-inch formatted cells for $375 and $775 USD, respectively.
The post Oceanside Photo and Telescope’s Narrowband Luminance Filter appeared first on Sky & Telescope.
New observations of galaxies in a universe just 800 million years old show that they’ve already settled into rotating disks. They must have evolved quickly to display such surprising maturity. Our cosmos was a messy youngster. Hotter and denser than the universe we live in now, it was home to turbulent gas flinging about under the influence of gravity. Theorists think the earliest galaxies built up gradually, first clump by […]