TAKAHASHI 645 SUPER REDUCER FOR CCA-250
Takahashi
TAKAHASHI 645 SUPER REDUCER FOR CCA-250 is backordered and will ship as soon as it is back in stock.
The Takahashi 645 Super Reducer is a 0.72x focal reducer for the CCA-250 corrected-Cassegrain astrograph. The 645RD reducer has a large image circle of 60mm, making it suitable for use with medium format sensors. The 0.72x reduction factor reduces the focal length to 890mm and focal ratio to f/3.6, transforming the CCA-250 into a high performance super astrograph.
The 645RD Reducer consists of four large-diameter lenses in four groups, giving illumination of more than 70% at the edge of the field. The illumination over a 44mm diagonal (such as that of a full-frame sensor) is more than 90%. The lenses are coated with broad-spectrum multi-layer coating, reducing reflections and increasing transmission over the visible range.
Specifications
| Optical design | 4 lenses in 4 groups |
|---|---|
| Reduction factor | 0.72 x |
| Backfocus | 56.2 mm |
| Image circle | 60 mm |
| Connection telescope side |
Screwed directly to CAA TKP86200 |
| Connection camera side |
M72 x 1 male |
| Total length |
74.2 mm |
| Weight |
200 g |
| SKU |
TK-TKA86580L |
