TAKAHASHI FSQ-85EDX ASTROGRAPH
Takahashi
Apochromatic Petzval quadruplet
85 mm
f/5.3
450 mm
3.1 kg
TAKAHASHI FSQ-85EDX ASTROGRAPH - OTA Only is backordered and will ship as soon as it is back in stock.
- Info
- Specifications
- Correctors
- Items included
- Downloads
- Reviews
The Takahashi FSQ-85EDX is an apochromatic Petzval quadruplet astrograph with uncompromising performance for wide-field deep sky imaging. With two S-FPL53 ED elements, the highly air-spaced quadruplet lens cell provides exceptional correction with a 44mm image circle when paired with the included 1.01x field flattener.
The FSQ-85EDX has a focal length of 450mm covering 5.6 degrees of sky and a focal ratio of f/5.3, making it the ideal instrument for capturing large nebulae. With the optional Reducer-QE 0.73x focal reducer, the telescope is transformed into a truly high-end astronomical telephoto lens with a focal length of 372mm and a focal ratio of f/3.8, while maintaining the full 44mm image circle.
Note: The Reducer-QE has been discontinued.
The oversized rack and pinion focuser is smooth and accurate and features a 1:7 microfocuser. The included CAA camera angle adjuster allows for precise framing of your target. For serious imaging, the Prima Luce Lab Esatto 3" robotic microfocuser is compatible with the additional PL3600271 adapter.
Matching 95mm tube rings from Prima Luce Lab are also available, allowing you to take full advantage of their PLUS universal system for connecting a multitude of accessories.
Note: The OTA ONLY variant does not include tube rings or a dovetail bar. For the FSQ-85EDX, you can use the PrimaLuceLab 95mm PLUS tube rings in combination with the PrimaLuceLab 240mm Losmandy bar.
Spot diagram of Takahashi FSQ-85EDX with 1.01x field flattener.
Spot diagram of Takahashi FSQ-85EDX with RD-QE 0.73x focal reducer (discontinued).
Spot diagram of Takahashi FSQ-85EDX with EX-ED 1.5x focal extender.
| Optical design | Modified Petzval quadruplet with ED glass |
|---|---|
| Lens cell |
Highly air-spaced quadruplet with 4 lenses in 4 groups, 2 x S-FPL53 lenses |
| Coatings |
Hard multicoatings |
| Objective diameter |
85 mm |
| Focal length at prime focus |
450 mm |
| Focal ratio at prime focus |
F/5.3 |
| Backfocus distance at prime focus |
197.5 mm |
| Tube diameter | 95 mm |
| Tube length | 615 mm with dew shield extended, 525 mm with dew shield retracted |
| Tube weight | 3.1 kg |
| SKU | TQE08541 |
| Prime focus focal length | 450 mm |
|---|---|
|
Prime focus focal ratio |
F/5.3 |
|
Prime focus backfocus distance |
197.5 mm |
|
FL 1.01x flattener focal length |
455 mm |
| FL 1.01x flattener focal ratio |
F/5.4 |
| FL 1.01x flattener backfocus distance |
56.2 mm |
| FL 1.01x flattener image circle |
44 mm |
| RD-QE 0.73x reducer focal length |
372 mm |
|
RD-QE 0.73x reducer focal ratio |
F/3.8 |
|
RD-QE 0.73x reducer backfocus distance |
72.2 mm |
|
RD-QE 0.73x reducer image circle |
44 mm |
| EX-ED 1.5x extender focal length | 680 mm |
| EX-ED 1.5x extender focal ratio | F/8 |
| EX-ED 1.5x extender backfocus distance | 117.5 mm |
| EX-ED 1.5x extender image circle | 44 mm |
OTA Only includes the following items:
- FSQ-85EDX OTA
- TKA37582 - 1.01x Field Flattener
- TKP37001 - Coupling (DT)
- TKA23200 - CAA-M
- TKA23250 - Aux Ring (FB)
- TKT37110 - Ocular Adapter (50.8)
- TKP00113 - 50.8 Sleeve
- TKP00103 - Coupling (S)
- TKP00101 - Ocular Adapter (31.7)
