Telescopes > Serious Amateur Refractor Telescopes
- Magnifications with Eyepieces Supplied): x30 & x120
- Highest Practical Power (Potential): x240
- Objective Lens Diameter (mm): 80
- Telescope Focal Length (mm): 600 (f/7.5)
- Eyepieces Supplied (31.7mm): 5mm & 20mm
- 9x50 Finderscope:
- 2"(50.8mm) Star Diagonal:
- Supplied with Tube Rings & Mounting Plate:
- Dual-fit 1.25"/2" Crayford Focuser (Backlash-Free)
- Multi-Coated Doublet Objective Lens:
- Single FPL-53 ED Fluorite Glass Objective Element:
- Built-in Polar Alignment Scope Holder:
- HEQ5 Super Heavy-Duty Equatorial Mount with Built-in Dual-Axis Motor Drives:
- 1.75” Stainless Steel Pipe Tripod with Accessory Tray:
- Supplied in Aluminium Carrying Case:
PRO-SERIES products are manufactured to extremely high levels of optical and mechanical precision, undergoing very strict quality control procedures and testing by specially assigned technicians, to ensure the highest standards of quality and performance are consistently maintained.
EVOSTAR PRO-SERIES 80mm / 100mm / 120mm FLUORITE ED APOCHROMATIC REFRACTORS are Premium quality, high performance telescopes for planetary and deep-sky observations as well as astrophotography and CCD imaging. Built with two-element multi-coated air-spaced objectives, the second element is made of the highest grade extra-low dispersion Japanese FPL-53 fluorite glass. Extra-low Dispersion glass allows the optical designer to virtually eliminate chromatic aberration (false color fringing around bright objects), which results in higher resolution and superior contrast in the images.
Each objective lens is finished by hand, by skilled opticians and the quality of each telescope is monitored by means of a Ronchi test* and an artificial star test **. No effort is spared to reach optimal optical quality.
This dedication to perfection together with aspheric shaping technology produce telescopes with virtually no aberrations and textbook star images.
Performance of these telescopes will both delight and surprise the most critical observer, and can be genuinely compared to Apochromatic refractors of other brands in price brackets normally way beyond the reach of the average user.
*The essential function of a telescope is gathering starlight without “disturbing” it. This means changing the path of the lightwaves without altering the lightwave itself. Lightwaves all together are referred to as a wavefront.
Alterations in this wavefront caused by the optics should be avoided. A wavefront analysis by Ronchi test will show an absence of wavefront alterations if the black and white lines (interference pattern) are perfectly straight and parallel.
**The artificial star test proves the ability of the optics to reproduce a pinpoint light source (star) as a pinpoint image. Concentric light circles will surround the pinpoint light dot. These increasingly faint light circles are unavoidable due to diffraction but being well concentric around the central light dot they are a warranty for good optical alignment of the lenses.
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