ToupTek HOPE D60 Full-Frame Planar Apochromatic Refractor Telescope
The ToupTek HOPE D60 is a compact, high-performance astrograph designed for deep-sky imaging. Featuring a 5-element Planar Apochromatic (PAPO) optical system with SD and Lanthanum glass elements, it minimizes chromatic aberration while delivering diffraction-limited performance. With a fast native f/4.66 focal ratio and an integrated field flattener, the HOPE D60 provides flat, pinpoint-sharp stars across a 44mm full-frame image circle at a standard 55mm back-focus distance.
【Key Optical & Mechanical Features】
5-Element PAPO Optical Design: Integrates SD and Lanthanum glass elements for superior color correction, achieving a central RMS spot size <1.1μm and full-frame edge RMS <2.3μm
Fast f/4.66 Focal Ratio: Maximizes light-gathering efficiency, making it ideal for capturing faint deep-sky details with reduced exposure times.
Native 44mm Full-Frame Flat-Field: Integrated field flattener delivers flat field correction with >90% relative illumination at the edge, eliminating vignetting without extra correctors.
Exceptional MTF Performance: Maintains MTF >0.95 at 10 LP/mm and >0.85 at 30 LP/mm, ensuring precise contrast and high resolution for astronomy targets.
Precision CNC Aluminum Construction: Highly resistant to vibration and thermal fluctuations for stable focus; blackened interior tube with a compact magnetic retractable lens hood effectively suppresses stray light.
3-Inch Precision Dual-Speed Focuser: Offers 30mm travel distance with zero backlash, fine scale markings, and focus window; seamlessly compatible with manual or electronic automatic focusers (EAF).
Integrated CAA & Versatile Interfaces: Built-in Camera Angle Adjuster (CAA) enables 360° rotation without equipment disassembly. Comes standard with an M48 adapter (optional M54 available), multi-function handle, and standard dovetail slots.
Ultra-Compact & Versatile: Measures just 255mm in length with the dew shield retracted. Easily converts into a high-performance telephoto lens for DSLR/mirrorless cameras or connects to dedicated astronomy cameras.
(Note: Due to optimized focal plane placement for astrophotography, visual observation with a star diagonal is not recommended.)
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Specifications
| Parameter | Details |
| Optical System | 5-Element Planar Apochromatic (PAPO with SD & Lanthanum glass) |
| Aperture | 60mm |
| Focal Length | 280mm |
| Focal Ratio | f/4.66 |
| Image Circle | 44mm (Full-Frame Coverage) |
| Back Focus | 55mm (from M48 thread interface; optional M54 supported) |
| Tube Construction & Length | CNC-machined high-strength aluminum alloy; 255mm (retracted) |
| Spot Diagram Performance | Center RMS < 1.1μm / Edge RMS < 2.3μm |
| Relative Illumination | >90% at 44mm full-frame edge |
| Focuser & Framing | 3" Dual-Speed Focuser (30mm travel, EAF compatible); 360° CAA |
| Mounting & Expansion | Multi-function handle, dovetail bar/slot, magnetic retractable dew shield |
| Primary Applications | Deep-Sky, Lunar, and Solar Astrophotography; DSLR Telephoto Imaging |
