Chromatic aberration of achromatic refractors increases as their aperture increases. This becomes especially apparent for achromatic refractors with short focal length (less than f/8) with apertures larger than 120mm. SPECIFICATIONS Objective lens (primary mirror) 130mm Neo-Achromatic Focal length 800mm Type Refractor Eyepieces LV20mm (40x, 75') - 31.7mm Mount Type GP-DX Equatorial Light Gathering Power 345x Finderscope 7x50mm (6.8deg) Resolving Power / Limiting Magnitude 0.89 / 12.3 Total Weight 29.6kg Optical Tube size / weight OD 140mm x L - 1024mm / 6.0kg Motor Drive / Controller Optional Tripod Type Aluminium Tripod (HAL110) 70-110 Accessories Diagonal Prism - 31.7mm, Triangle Accessory Tray