Astromania 0.5X Reducer for Photography And Observing - 1.25" Filter Thread (28.5x0.75MM) on Both Sides - Reduces The Focal Length for Visual

About Astromania 0.5X Reducer for Photography and Observing

•  Free Light Transmission
22.5mm lens aperture. Can be used with additional spacers (available separately) to achieve further focal reduction.

•  The simple way to increase your webcam's field of view
Screw the Astromania reducer into the filter thread on your camera and so double the size of the photographic image field. This lets you take images of much larger areas of the lunar surface, for example. The reducer is also great for taking videos of the Moon using your webcam. You can obtain even larger image fields with your astronomy webcam if you attach an extension tube (e.g. 25mm) between the reducer and camera.

Our Expert Comment:

•  The reducer is useful for 0.25 to 0.5 inch chips (webcams, DMK, Watec) and focal ratios from f8 (refractors, Maksutov and SCs). It needs about 5cm of back focus. The result an f4 to f6 optical system. The reducing effect can varied by using the distance from the chip, e.g. by filter rings.

•  The reducer is unsuitable for DSLRs and large CCD cameras as the chips are not completely illuminated.

The advantages in a nutshell:
 

  •  0.5X focal length
  •  Expands the image field of your webcam
  •  More light intensity
  •  Can be used visually with an eyepiece
  •  Also optimal for video astronomy
  •  Take images of larger areas of the Moon's surface