The David Astro Tools Astrophotography Framing Assistant is a powerful tool designed to help you precisely frame your celestial targets.

By selecting your equipment from our extensive database (camera, telescope, focal reducer) or manually entering key details (focal length, pixel size, sensor size), you can visualize your composition in real-time with the help of the dynamic Aladin API navigator.

Additionally, the tool provides a comprehensive table of calculated values, including

    Focal Ratio
    Effective Focal Length
    Field of View (FOV)
    Resolution
    Dawes Resolution
    Rayleigh Resolution
    These values can be found at the bottom of this page, in the table.
ensuring an optimal setup for stunning astrophotography.
Telescope / Lens
Allowed values: between 30 and 2000 mm
Allowed values: between 10 and 10000 mm
Camera
Resolution (px)
Allowed values: between 100 and 50000 px
⨉
Allowed values: between 100 and 50000 px
Pixel Size (μm)
Allowed values: between 0.1 and 100 μm
⨉
Allowed values: between 0.1 and 100 μm
Focal Ratio -
Effective Focal Length -
Field of View (FOV)
Width x Height -
Diagonal -
Resolution -
Dawes Resolution -
Rayleigh Resolution -
Reset