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• John Haynes
  ...AP. It really isn't accurate enough. With a light payload and short-focal length, it can do some tolerable wide-field images. Not much else.
  5 KB (924 words) - 15:51, 31 January 2019
• Bird-Jones Telescope
  ...advantage of the principle of reducing aberration through increased focal length. Because the Bird-Jones design uses both mirrors and lenses, it is classif ...Barlow lens. Indeed, it is precisely this feature of halving the physical length of the tube that leads department stores to carry Bird-Jones scopes; they c
  6 KB (838 words) - 05:00, 18 January 2022
• Recommended Mounts for Beginning Astrophotography
  ...ring the duration of the exposure. This is strongly affected by the focal length of the telescope and the size of the image sensor. ===Image Sensor and Focal Length===
  6 KB (1,114 words) - 17:33, 8 April 2019
• Problems Focusing A Newtonian Telescope With a Camera
  ...To achieve focus for an eyepiece, the focal point of the eyepiece and the focal point of the telescope must come together. ...e eyepiece in relation to that of the telescope, this moves the eyepiece's focal point in and out so that you can adjust its position and reach focus.
  6 KB (994 words) - 18:32, 14 February 2019
• Exit Pupil
  ===Using telescope focal ratio and eyepiece focal length=== ...mputing exit pupil is to divide the eyepiece focal length by the telescope focal ratio
  8 KB (1,409 words) - 13:10, 4 February 2020
• Field of View
  ...ication the eyepiece is operating it, meaning it depends on what the focal length of the telescope it is used in is. <code>eyepiece field stop diameter in mm / telescope focal length in mm x 57.3</code>
  8 KB (1,285 words) - 22:07, 17 May 2019
• Barrel Size
  ...a 2" barrel in order to provide that apparent field of view at that focal length. ...ical design and characteristics. Instead, choose eyepieces for their focal length and apparent field of view, and don't worry about what the barrel size is.
  3 KB (536 words) - 23:21, 19 May 2019
• Focal Ratio
  ...st scope" or "long focal ratio" or "telescope speed" all refer back to its focal ratio number. ...l ratio itself isn't as important as the telescope's aperture or its focal length, but it does play a key role in describing the various aberrations that can
  7 KB (1,162 words) - 17:38, 20 May 2019
• Magnification
  ...tself by that of the eyepiece being used. Thus if a telescope with a focal length of 1,000mm is used with a 25mm eyepiece, the magnification factor is 40x. .... Thus, if two eyepieces have the same AFOV, then if you double the focal length of the eyepiece, you double the field of view, making the object appear 1/2
  3 KB (470 words) - 17:04, 20 May 2019
• Barlow
  ...focuser and the eyepiece, whose purpose is to increase the effective focal length of the telescope. Common Barlow multiplications are 2x and 3x, but Barlows ...elescope, a 2x Barlow would cause the telescope to have an effective focal length of 2000mm, which would then double the magnification of any eyepieces used
  6 KB (1,062 words) - 21:57, 20 May 2019
• Chromatic aberration
  ...which causes different wavelengths (colors) of light to focus at different focal lengths and degrades the image. ...ard the center axis of the lens. Where the light rays all converge is the focal point.
  3 KB (576 words) - 20:05, 25 May 2022