Astromania 1.25" 0.5x Reducer Corrector - C-Mount Standard for C Or CS Mount CCTV Type Cameras with Telescopes

•  Mounting threads
1.25" filter thread (28.5x0.75 MM) on one sides, the opposite end of this adapter has a C-Mount. Adapt the focal reducer to a standard C-mount video camera; Threads at the bottom of the c-mount adapter fit the threads on the focal reducer; The threads at the top of the adapter fit the C-mount on your camera.

•  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 C or CS mount CCTV type cameras and so double the size of the photographic image field. This lets you take images of much larger areas of the lunar surface. 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 reducer for screwing into the filter thread
•  Expands the image field of your webcam
•  More light intensity
Also optimal for video astronomy
•  Take images of larger areas of the Moon's surface