APM RICCARDI 0.75x REDUCER M63 FOR ESPRIT & GSO RC
APM
APM RICCARDI 0.75x REDUCER M63 FOR ESPRIT & GSO RC is backordered and will ship as soon as it is back in stock.
The APM Riccardi 0.75x Reducer M63 is a high quality triplet ED reducer/flattener for apochromatic refractors. It is compatible with the Sky-Watcher Esprit 100, 120 and 150, along with many other apo refractors which have an M63 x 1 thread. It is also compatible with GSO Ritchey-Chretien telescopes from 10" and larger.
Designed by legendary optical designer Massimo Riccardi, this reducer provides a large corrected field and transforms your telescope into a true astrograph. By contrast, the Sky-Watcher reducers only cover a 34mm field, making them unsuitable for use with full-frame sensors.
The APM Riccardi Reducer features multi-coatings optimized for the spectral range of modern sensors. An optional tilter is available for precise adjustment of the field to optimize star shapes in the corners of the frame.
Note: Optimise focus with this combination for Esprit 100, 120, or 150: Baader M74 female to M68 female adapter and M68/M63 to M48 adapter.
Specifications
| Telescope side connection |
M63 x 1 male |
|---|---|
| Camera side connection |
M63 x 1 female |
| External diameter reducer | 67mm |
| Depth female thread | 3.6mm |
| Height male thread | 4.6mm |
| Telescope side free aperture | 55mm |
| Backfocus distance | Varies (see "Backfocus" tab) |
| Coating |
Multi-coating |
| Reduction factor |
0.75x |
| Corrected field |
40 mm for refractors, up to APS-C for RC |
| SKU | APM-RIRED-M63-small |
Backfocus
| Sky-Watcher Esprit 100 | 80 mm from end of M63 threads |
|---|---|
| Sky-Watcher Esprit 120 | 77.1 mm (approximately) from end of M63 threads |
| Sky-Watcher Esprit 150 | 74 mm from end of M63 threads |
| GSO RC 10" | 70.55 mm from end of M63 threads |
