FSQ-106EDX4
Takahashi
The Takahashi FSQ-106EDX4 is an advanced redesign of the FSQ-106, combining a four-element quadruplet Petzval optical design with extra-low dispersion (ED) glass for exceptional color correction across UV, visible, and infrared wavelengths. Its redesigned four-element double ED element modified Petzval optics have been optimized for both imaging and visual applications. The focuser is a new ultra-duty 4" rack-and-pinion design with both 2" and 1.25" eyepiece adapters featuring silky-smooth motion and oversize knobs that make sharp focus easy to achieve, even at very high powers. The generous 178mm back focus allows attachment of a variety of imaging packages, binoviewers, 2" star diagonals, and many visual devices including electric focusers, filter wheels, and adaptive optics systems.
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Specifications
| Aperture (inches) | 4.2 in |
| Focal ratio | f/5 |
| Tube Diameter | 125 mm |
| Focuser Type | 4 inch rack-and-pinion with camera angle adjuster |
| Focal length | 530 mm |
| Back Focus | 178 mm |
| Weight (OTA Only) | 11 kg |
| Field of View | 9.5° |
| Weight | 7 lb |
| Aperture | 106 mm |
| Image Circle | 88 mm |
| Tube Length (dew shield extended) | 521 mm |
| Optical Elements | 4 elements in 4 groups |
| Tube Length (dew shield retracted) | 425 mm |
| Optical design | Quadruplet Petzval with dual ED elements |