Description
This 0.8X focal reducer/field flattener is designed specifically for prime focus astrophotography with the SVBONY SV550 122mm f/7 apo refractor. The fully-multicoated reducer/flattener converts the 854mm focal length f/7 refractor into a 683.2mm f/5.6 system for faster and wider field astronomical and terrestrial photography. In addition to reducing the focal length of the telescope and thereby increasing the photographic speed, the flattens the normal field curvature inherent in refractors. This provides images that are sharply focused out to the corners of DSLR and CCD imaging chips. The reducer/flattener threads into the focuser for a secure connection. The threading is metric 63x1. Back focus is 55mm from the shoulder of the reducer to the image plane, the standard spacing for DSLR camera bodies.
SVBONY SV209 0.8x Reducer/Field Flattener for SV550 122mm f/7 Triplet APO Refractor
How To Use
1. SV550 122mm APO Telescope 2. Remove the adapter 3. Connect SV209
The Component of SV209 Reducer/Field Flattener
The reducer/flattener threads into the focuser for a secure connection. The threading is metric 63x1.
Correction of Field Curvature Defects
-- Improving Image Quality At The Edge Of The Field Of View
In addition to reducing the focal length of the telescope and thereby increasing the photographic speed, the flattens the normal field curvature inherent in refractors. This provides images that are sharply focused out to the corners of DSLR and CCD imaging chips.
Back Focus Of The SV209 Is 55 mm
Back focus is 55mm from the shoulder of the reducer to the image plane, the standard spacing for DSLR camera bodies.
Fully-Multi-Coated Lens Structure
The fully-multicoated reducer/flattener converts the 854mm focal length f/7 refractor into a 683.2mm f/5.6 system for faster and wider field astronomical and terrestrial photography.
Package Includes
1. SV209 0.8x Reducer/Field Flattener
2. 2PCS Dust Cover