Tool for determining the field of view for deep sky astrophotography
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README.md

Observation Field of View

Field of View is a simple web application to aid in astrophotographic planning and composition. It allows you to determine how large a deep sky object might appear based on the sensor-size of the capture device (with common 35mm/DSLR/consumer camera sensor sizes as well as custom sizes) and the focal length of the lens or telescope, with the option to include the modification factor of a focal reducer.

Images of the objects are retrieved from NASA's SkyView.

It is hosted on observationapp.com.

Example:

M31, framed for a 600mm telescope and an APS-C sensor:

Example of M31 framing

License

BSD. See LICENSE file.