Specially designed for the FRA400C, this 0.7x reducer adopts
a triplet lens design, it can reduce the overall focal length to 280mm and the
focal ratio to F3.9 while providing a flat-field correction. When used with the
reducer, the FRA400C supports full-frame imaging and the back focus is a
standard 55mm.
The shorter focal ratio enables the telescope to achieve a
wider field of view and faster exposure times, making it ideal for capturing
large nebulae, star clusters, as well as faint and fast-moving celestial
objects.
The FRA400C reducer features an M48×0.75 rear-end adapter
and has a built-in 2-inch filter thread for convenient filter attachment.
Specifications
|
0.7x
Reducer Parameters
|
|
|
（After
attaching）FRA400C
Focal length
|
280mm
|
|
（After
attaching）FRA400C
Focal ratio
|
f/3.9
|
|
Lens Number
|
Triplet design
|
|
Back Focus
|
55mm（from
the base of M48 male thread）
|
|
Weight
|
0.46kg
|
|
Rear-end thread type
|
M48×0.75 (M48×0.75 filter thread inside)
|
|
0.7x
Reducer Size Diagram
|
|
0.7x
Reducer Installation
|
|
Spot
Diagram
|
