A 3-9 x 32 SFP (Second Focal Plane) rifle scope is not ideal for astronomical observation, although it is technically possible to use any optical device to observe celestial objects. Here’s a detailed explanation of why it’s not suitable:
Magnification and Aperture: The magnification of 3-9x means the scope can provide a view that makes objects appear 3 to 9 times closer. The 32 refers to the diameter of the objective lens in millimeters, which in this case is 32mm. While this might be sufficient for shooting or observing large terrestrial objects, astronomical observation usually requires higher magnification and larger apertures to gather enough light to see distant and faint celestial bodies clearly.
Field of View: Rifle scopes are designed for a narrow and precise field of view to focus on targets. Celestial objects often require a wider field of view to locate and track them effectively, as well as to appreciate larger structures such as constellations or the Milky Way.
Light Gathering Ability: A larger objective lens is crucial in astronomy because it allows more light to enter, which is critical when observing dim celestial objects. A 32mm lens has limited light-gathering capability, hindering the view of faint stars or planets.
Stability and Mounting: Rifle scopes are not designed to be mounted on equatorial or alt-azimuth mounts that are commonly used in telescopes for celestial tracking. This can make it difficult to keep extraterrestrial objects in view as the Earth rotates.
Optical Coatings and Features: Dedicated astronomical telescopes often have specific optical coatings and features, such as anti-reflective coatings, to enhance image quality and contrast for celestial viewing. Rifle scopes may not include these enhancements, which could limit their effectiveness for astronomy.
In summary, while a rifle scope might allow you to view some of the brighter celestial objects, such as the Moon or perhaps Jupiter’s main moons during optimal conditions, the experience will be limited. For a better astronomical experience, investing in a beginner telescope or binoculars designed for stargazing is advisable.