Mars by Jean-Luc Dauvergne
Dall-Kirkham Mewlon series reflectors are long focal length telescopes with high F/D focal ratio. The primary mirror is ellipsoidal while the secondary mirror is spherical. The surface accuracy of the optics is at least λ/20.
The CRS models incorporate a field corrector with ED glass lenses that provides a F/10 focal ratio but above all a higher corrected field than on conventional Mewlon telescope. The motorized focusing, ASCOM compatible, is done by translating the secondary mirror. The fans responsible for heating the primary mirror are managed by 3 temperature sensors located inside and outside the tube.
The Mewlon-300CRS is perfectly suited for planetary observation and imaging, due to its long focal length. It is also ideal for deep sky applications; equipped with the F/7.2 reducer it will allow the imaging of compact objects such as planetary nebulae or galaxies.
The optical tube assembly is delivered with 7x50 finder scope and with a pair of rings connected by a plate located at the top of the tube.
| Characteristic | Takahashi Mewlon-300CRS reflector |
| Optical design | Modified Dall-Kirkham |
| Combination | Concave elliptical primary mirror + convex spherical secondary mirror + field corrector |
| Diameter | 300 mm |
| At prime focus | |
| Focal length | 2960 mm |
| Focal ratio | F/9.9 |
| Image circle diameter | 40 mm |
| Metal Back Distance | 189.5 mm |
| With RD CR0.73X focal reducer | |
| Focal length | 2160 mm |
| Focal ratio | F/7.2 |
| Image circle diameter | 35 mm |
| Metal Back Distance | 72.2 mm |
| With EX CR1.5X focal extender | |
| Focal length | 4475 mm |
| Focal ratio | F/14.9 |
| Image circle diameter | 44 mm |
| Metal Back Distance | 117.5 mm |
| Characteristic | Takahashi Mewlon-300CRS reflector |
| Length of the optical tube assembly | 1140 mm |
| Diameter of the optical tube assembly | 324 mm |
| Weight | 27 kg |
Spot-diagram of Takahashi Mewlon-300CRS reflector at prime focus
Spot-diagram of Takahashi Mewlon-300CRS reflector with RD CR0.73X focal reducer
| System-chart of Takahashi Mewlon-300CRS reflector | Télécharger |
| System-chart of Takahashi Mewlon-300CRS reflector with EX CR1.5X | Télécharger |
| ASCOM ActiveFocuser Driver | Download |
| INDI ActiveFocuser Driver | Download |
| Instruction manual of Takahashi Mewlon-300CRS reflector | Télécharger |
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Mars by Jean-Luc Dauvergne
Saturn by Jean-Luc Dauvergne
Jupiter by Jean-Luc Dauvergne
