Telescopes

Each optical set is selected to match the telescope’s overall precision:

• Reflectivity > 95%
• Correction of λ/8 or better
• Strehl Ratio ≥ 0.95

Each optical set is selected to match the telescope’s overall precision:

• Reflectivity > 95%
• Correction of λ/8 or better
• Strehl Ratio ≥ 0.95

High-Performance Optics – Quartz Mirrors, Superior Coatings

• Optical design: Classic Newtonian
• Primary mirror diameter: 206mm (conical quartz)
• Secondary mirror diameter: 88mm
• Native focal ratio: f/4.0
• Focal length: 800mm (912mm with coma corrector)
• Included coma corrector: 1.14x, resulting in f/4.5
• Mirror material: High-grade quartz with >95% reflectivity
• Optical correction: λ/8 or better
• Strehl ratio: ≥ 0.95
• Linear obstruction: 44%
• Fully illuminated field: 39mm
• Corrected field: 55mm – ideal for full-frame sensors

ARTEC astrographs employ optics that match the mechanical precision of the instrument. Key specifications include:

• Reflectivity greater than 95%
• Surface correction of λ/8 or better
• Strehl ratio of 0.95 or higher

With the FRA600 F/5.6 quintuplet astrograph, Askar has created a pure-color apochromat for astrophotography with large sensors.

• Aperture 108 mm / 4.3"
• Focal length 600 mm
• Focal ratio f/5.6
• 5-element design - the 2-element corrector is permanently installed in the tube
• 66 mm image circle with full illumination and correction
• 140 mm working distance for observation with 2" star diagonal
• Long transition adapter for photography to M48x0.75 with 2" filter thread included
• Rugged 4" RAP focuser with dual speed reduction and 360° rotation
• Losmandy style dovetail bar
• Flexible tube rings with carrying handle and lateral threads for individual adaptations
• Finder shoe for standard finder bracket
• Each FRA600 comes with an inspection checklist from the manufacturer and is also tested on our optical bench

The ASKAR FRA 500/5.6 APO quintuplet apochromat from Sharpstar is optimized for astrophotography with high resolution cameras

• Aperture 90 mm
• Focal length 500 mm / focal ratio f/5.6
• 5-element quintuplet design with corrector in tube
• Two ED glasses in the triplet objective for very good correction of the chromatic aberration
• 55 mm image circle with full illumination and correction
• 158 mm maximum working distance from drawtube with all adapters for photography and observation
• Stable 3.5" dual-speed RAP focuser with 360° rotation
• Adapters to M68x1, M54x0,75, M52x0,75 and M48x0,75 are included in delivery
• Starting with the M48 thread, you have comfortable working distance for all common astro cameras, DSLR and system cameras
• Flexible Losmandy style dovetail bar with photo tripod connection and carrying handle with flexible oblong hole
• Finder shoe for standard finder holders
• Including inspection check list of the manufacturer

The ASKAR APO 72 mm f/5.6 quintuplet apochromat from Sharpstar is optimized for astrophotography with high resolution cameras

• Aperture 72 mm
• Focal length 400 mm / focal ratio f/5.6
• 5-element quintuplet design with corrector in tube
• Two ED glasses in the objective for very good correction of the chromatic aberration
• 44 mm image circle with full illumination and correction
• 140 mm working distance for visual observation or focal length reduction
• Stable 3" dual-speed RAP focuser with 360° rotation
• 2" and 1.25" receptacles as well as M68x1 external thread for screw adaptations
• Long adapter from M68 to M48x0.75 camera connection is included in delivery (with 2" filterthrad)
• Flexible GP/EQ5 style dovetail bar with photo tripod connection and carrying handle with flexible slotted hole
• Finder shoe for standard finder holder
• Including inspection check list of the manufacturer

The ASKAR APO 60 mm f/5 Quintuplet Apochromat from Sharpstar is optimized for wide field astrophotography with high resolution cameras

• aperture 60 mm
• focal length 300 mm / focal ratio f/5
• 5-element quintuplet design with corrector in the tube
• ED glass in the lens for very good correction of chromatic aberration
• 44 mm image circle with full illumination and correction
• Working distance optimized for photography - e.g. with cameras with 55mm flange focal length
• Stable 2.5" RAP focuser with micro reduction and 360° rotation
• M54x0.75 , M48x0.75 and T2 adapter included for easy camera adaption
• Internal thread for 2" filter available
• Flexible GP/EQ5 level Dovetail bar with photo tripod connection and carrying handle with flexible oblong hole
• Viewfinder shoe for standard viewfinder bracket

The 80PHQ is a very transportable APO refractor for astrophotography with corrected field of view up to full frame format and for observing up to the highest magnification range.

• Aperture 80 mm / focal length 600 mm / focal ratio f/7.5
• 4-element Petzval system with color clean triplet objective and one corrector lens built into the tube
• Stable 3" RAP focuser with dual speed and 360° rotation
• Sufficient working distance for observation with 2" accessories
• Suitable photo adapters are included in delivery
• Illuminated image circle with very good correction up to full frame format
• CNC tube rings with Vixen style EQ5 dovetail bars and carrying handle
• Finder shoe for standard finder and mini guiding telescopes available
• High quality carrying case for optimal protection of the telescope
• Each Quadruplet Apo is inspected upon receipt, you will receive an optimally adjusted telescope for successful photography and observation from the very beginning.

The very good correction and the self-flattening design make this small telescope a compact photo machine.

• Aperture 65 mm / focal length 416 mm / focal ratio f/6.4
• 5-element system with color clean triplet objective and two corrector lenses built into the tube
• Stable 2.5" RAP focuser with dual speed and 360° rotation
• Sufficient working distance for observation with 2" accessories
• Suitable photo adapters are included in delivery
• Illuminated image circle with very good correction up to full frame format
• CNC tube rings with Vixen style EQ5 dovetail bars and carrying handle
• Finder shoe for standard finder and mini guiding telescopes available