Focal Length (mm): Barlow
x
Width of Film/CCD (mm):
Height of Film/CCD (mm):
or select camera
or select telescope/lens
Field of View (W): Field of View (H):
Size of object (in pixels) for CCD/DSLR
Resolution of Sensor:
Angular Diameter of Object
Degrees: Arcmin:
Arcsec:
or select object
Pixels per degree: per
arcminute:per arcsecond: Arcseconds per pixel:
Pixels:
Graphical Representation of size
About
This calculator can be used to help plan an astrophotography session when
using prime focus with or without a barlow lens. Above
you can calculate the field of view after entering in the focal length of a
lens or
telescope and the width and heigh of the CCD/Sensor/Film for your camera.
Below that you can calculate the size
an object in pixels. The size calculation includes a graphical
representation to demonstrate the scale of the object which shows a moon by
default, and changes between the moon and jupiter as the moon or jupiter
size selections are used or you can click on the image to cycle through
available images. To calculate only the field of view you only need to
fill in the values above the line. To calculate the size of an object you
must fill in the fields above and below the line. This calculator is provided as-is with no
guarantee that it is accurate. Please feel fee to contact me if you have
any questions or encounter any problems (my contact information is at the
bottom of my main site).
