## Astrophotography Field of View Labs

Field of View (FOV) determines how big the object being photographed is in the image.

• Astrophotography by Astronomy Magazine
• What is the FOV for 35mm film using a 50mm focal length lens?
• What is the FOV for 35mm film using a 300mm focal length lens?
• Labs
• Using the lens field of view in degrees table what is the longest 35mm film focal length lens that can be use to fit constellation Orion with north at the top of the image and the image is in landscape mode (hit: use the constellation lines and Orion Java applet)

• Field of view and Focal length by Wikipedia
• Astrophotography and Digital Imaging: Matching Camera to Telescope PDF by Chris Patel
• The angle of view (field of view, FOV) depends on the focal length and what other specification?
• Increasing the focal length of the optics increases or decreases the FOV?
• Which 350 mm or 2000 mm focal length is easier to use for long exposure astrophotography? Why?

• Image sensor format and Sensor size and angle of view by Wikipedia
• Increasing the image sensor size increases or decreases the FOV?
• If you have a DSLR camera what is its horizontal and vertical image sensor size?
• If you have a CCD camera what is its horizontal and vertical image sensor size?

• Crop factor by Wikipedia
• Increasing the crop factor increases or decreases the FOV?
• If you have a DSLR camera what is its crop factor?
• Does the crop factor change the focal length of the lens?
• Does the crop factor change the focal ratio of the lens?

• Minute of arc by Wikipedia
• How many arcminutes are there in one degree?
• How many arcseconds are there in one arcminutes?
• How many arcseconds are there in one degree?
• Labs
• What is the angular diameter of the Moon in arcminutes and degrees?
• Find the diameter of the Moon in arcseconds at USNO Apparent disk of Moon
• Convert the Moon angular diameter of the disk in arcseconds to arcminutes at Angles Conversion
• Convert the Moon angular diameter of the disk in arcseconds to degrees.
• What is the angular size of the M31 in degrees?
• Find the size of M31 in degrees, arcminutes or arcseconds. Try M31 at SEDS
• How many full Moons fit in M31 (rounding up)?

• DSLR Field of View Calculator by Howard's Astronomical Adventures
• This is an example of using Nikon D70 DSLR camera and 300 mm lens.
• X size: 4° 31‘ 26" or 4.524 degrees
• Y size: 2° 58‘ 44" or 2.979 degrees
• Sampling: 5.363 Arcseconds per Pixel
• Labs
• How many full Moons fit vertically in an image taken by a Nikon D70 and a 300 mm lens?
• Compare the Moon angular diameter in arcminutes to the above Y size: 2° 58‘ 44"
• How big is the Moon in an image taken by Nikon D70 DSLR camera and a 180 mm lens?
• How many Moons fit horizontally in the image?
• Image taken with this configuration
• How big will M31 be in an image taken by Nikon D70 and a 180 mm lens?
• How many M31s fit in the image?.
• Image taken with this configuration
• What is the FOV of the Nikon D70 DSLR camera and Orion Argonaut 150mm Maksutov-Cassegrain telescope, (f/12 focal ratio, 1800mm focal length) with a focal reducer/corrector (1800mm to 1440mm, f/12 to f/9.6)?
• How big will M13 be in an image taken by Nikon D70 and a Orion Argonaut 150mm Maksutov-Cassegrain telescope with a focal reducer/corrector?
• Image taken with this configuration
• Will an image taken by a Nikon D70 and a 300 mm lens split the double stars of Epsilon 1 from Epsilon 2 of the Epsilon Lyrae or Double Double?
• Will an image taken by a Nikon D70 and a 300 mm lens split double stars of Epsilon 1
• Will an image taken by a Nikon D70 and a 300 mm lens split double stars of Epsilon 2

• CCD Cameras Field Of View Calculator by Adventures In Astronomy & Nature
• Example of using the CCD Cameras Field Of View Calculator
• Orion StarShoot Deep-Space Color Imaging Camera
• Orion Telescopes and Binoculars 80mm ED Apochromatic Refractor, 600mm focal length
• Telescope None Selected
• Enter User Defined Focal Length of 600
• Pixel Size: 2.16"/pixel
• Field of View Width: 28.1'
• Field of View Height: 20.6'
• Images taken with this configuration
• Labs
• Will a full Moon fit in an image taken by Orion Telescopes and Binoculars 80mm ED Apochromatic Refractor with 600mm focal length and Orion StarShoot Deep-Space Color Imaging Camera?
• Using the Orion Telescopes and Binoculars 80mm ED Apochromatic Refractor with 600mm focal length.
• Which of the following cameras has the largest FOV? Smallest?