Περιγραφή
The four-element FRA600 f / 3.9 reducer was developed as a dedicated accessory for the Askar FRA600 / 5.6 astrograph. It guarantees excellent field correction, thanks to which it works perfectly with professional cameras and camcorders equipped with a full-frame matrix.
This reducer reduces the focal length by a factor of 0.7x, which in the case of the Askar FRA600 astrograph gives the value of 420 mm at f / 3.9. Such parameters allow not only to take breathtaking photographs in a wide field of view, but most of all to shorten the exposure time even by a half.
This tool allows for the installation of filters with a diameter of 2 “, screwed into the M48x0.75 thread on the camera side.
The most important features of the Askar FRA600 f / 3.9 reducer
- a dedicated focal reducer for the Askar FRA600 astrograph, compatible with cameras and full-frame cameras
- a multiple of 0.7x giving an effective focal length of 420 mm at f / 3.9
- can be used with filters with a diameter of 2 “
- 55mm back focus
