65mm Apo Flatfield Astrograph With 416mm Focal Length F6.4 Quadruplet Air Spaced Optics Full Frame Ready For Deep Sky Imaging And Visual Astronomy No Flatteners Needed
✔️ 65PHQ quintuplet with ED glass, full-frame circle, single unit
The 65PHQ is a flatfield astrograph designed for deep-sky imaging and visual astronomy. No flatteners needed thanks to its self-flattening quintuplet design with two ED glass elements, delivering edge-to-edge sharpness on full-frame sensors. The OTA weighs about 2 kg, and the full package with tube rings and accessories comes in at roughly 2.8 kg.
✅ 65PHQ flatfield astrograph with quintuplet optics including two ED glasses
✅ Focal length 416mm and f/6.4 for wide field imaging
✅ Full-frame imaging circle supported, minimal peripheral distortions
✅ 2.5” rigid focuser with 360° rotator, finder base
✅ Adapters included: M68, M54, M48 with M48 2” filter thread
✅ Lightweight OTA about 2 kg; full kit ~2.8 kg with rings and handles
✅ Portable with multifunction handle, 300mm dovetail plate, double tube rings
💡 What is a flatfield astrograph best used for in astrophotography?
It's a handy device for capturing sharp, flat-field images across a full-frame sensor. Handy for both imaging and visual work.
- edge-to-edge sharpness across full-frame sensors - reduces field curvature and edge aberrations - handy for deep-sky imaging and visual use with standard adapters - supports camera mounts like M68, M54, M48 ✝️