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The optics in the AP 72/420 telescope use a doublet lens with one lens element made from a particularly low-refractive index ED glass. High quality Schott glass is used for the crown glass element. Each glass-air surface in the optics is provided with a metallic anti-reflection coating for achieving an outstanding maximum light transmission of 99.5%! This optical design of the apochromat ensures an absolute minimum of chromatic aberration and provides a very sharp image!
This affordable, short focal length refractor is ideal for the astrophotography of large star fields without the need for a heavy duty astronomical mount. It is also ideal for when traveling or for portable astrophotography in general. The sensitive focuser with a 1:11 reduction gearing is a great help when focusing.
This telescope is designed as an astrograph, that is, the focal position is designed for astrophotography.
Optics | |
---|---|
Type: | Refractor |
Type of build: | Apochromat Doublet |
Aperture (mm): | 72 |
Focal length (mm): | 420 |
Focal ratio: | F/5,8 |
Max. useful magnification: | 144 |
Light gathering capacity: | 110 |
Resolving capacity: | 1,60 |
Limiting stellar magnitude (mag): | 11,1 |
Focuser: | Crayford 1:11 |
General | |
Series: | EvoStar |
Tube weight (kg): | 1,96 |
Included accessories | |
Carrying bag: | Yes |
Prism rail: | Vixen-Style |
Recommended for: | |
Beginners: | No |
Intermediate: | Not recommended |
Advanced: | Yes |
Area of application | |
Nature observation: | Yes |
Moon & planets: | Yes |
Nebula & galaxies | Yes |
Astrophotography: | Yes (Very good) |
Sun: | No (only with appropriate Sun filter) |