Askar f / 3.9 Full-Frame Reducer for FRA400 / FRA500 Flatfield Astrograph (SKU: ASRED72)

The FRA400 f/3.9 reducer was developed as a dedicated accessory for the Askar FRA400 / FRA500 astrograph. It guarantees excellent field correction, making it ideal for use 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 FRA400 astrograph gives a value of 280 mm at f/3.9. Such parameters allow not only to take breathtaking photos in a wide field of view, but above all to shorten the exposure time by up to half.

This device allows 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 f/3.9 reducer

• focal reducer dedicated to the Askar FRA400 and FRA500 astrographs, compatible with cameras and full-frame cameras
• 0.7x multiplicity giving an effective focal length of 280 mm at f/3.9 for FRA400 and 350 mm at f/3.9 for FRA500
• can be used with filters with a diameter of 2"
• 55mm back focus

Technical parameters

• multiplicity: 0.7x
• compatibility: Askar FRA400 / Askar FRA500
• focal length without reducer: 400 mm / 500 mm
• focal length with reducer: 280 mm / 350 mm
• aperture without reducer: f/5.6
• aperture with reducer: f/3.9
• rear thread (camera side): M48x0.75
• front thread (extractor side): M61x1
• possibility of installing a filter: yes, 2"
• back focus: 55 mm
• length: 63 mm
• diameter: 72 mm

Set elements

• Askar f/3.9 reducer

Guarantee

24 months

Product code: AASVARRED72_ASK · EAN: 6975213904015