AstrHori 6mm f/2.8 Circular Fisheye
AstrHori · 6 mm · f/2.8
Score Breakdown
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What We Like
+Exceptional 220° ultra-wide field of view captures entire sky for astrophotography
+Sharp center sharpness even at f/2.8 with smooth manual focus ring and clicked aperture
+Compact and lightweight at 340g, easily portable for specialized shooting
+Excellent low-light performance with fast f/2.8 aperture ideal for night sky and Milky Way
+Solidly built metal construction with professional feel
+Outstanding close focus capability at 0.08m enables creative macro-style fisheye shots
Worth Knowing
−Manual focus ring lacks precision—turns too easily and can slip out of position with slight touch
−No filter support due to massive front element bulge
−Extreme distortion and composition challenges—difficult to keep feet, hands, and tripod out of frame
−Limited video utility as top and bottom portions of circular image get cropped
General | |
|---|---|
About This LensThe AstrHori 6mm f/2.8 Circular Fisheye is a specialized manual-focus ultra-wide for full-frame mirrorless cameras, delivering an extraordinary 220° field of view that captures the entire sky in a single circular image. Optically sharp in the center and solidly built at just 340g, it excels for astrophotography and creative landscape work, though its extreme distortion and loose focus ring demand deliberate technique and limit mainstream appeal. | |
| Brand | AstrHori |
| Release Year | 2025 |
Production Status ⓘCurrent status of lens manufacturing (e.g., in production, discontinued). |  In Production |
Lens Mount ⓘThe lens mount will tell you what type of lens range you can fit onto the camera body. Often the same camera company will have different lens ranges for different cameras. | Canon RF |
System ⓘIndicates which camera system the lens is designed to attach to. | Canon EOS R |
Maximum Format ⓘLargest sensor size compatible with the lens. |  Full Frame |
Physical | |
| Lens Weight | 340 g |
Lens Diameter ⓘWidth of the lens at its widest point | 65 mm |
Lens Length ⓘHow long the lens is from front to back. | 61 mm |
Front Filter Compatible ⓘSome lenses are compatible with front filters, some are compatible with back filters and some are compatible with both. Front filters are usually more convenient to add and remove. | No |
Optics | |
Focal Range ⓘShortest to longest focal length of the lens (zoom range start - end ) | 6 mm |
Aperture Range ⓘLargest aperture at the lens's shortest focal length to longest focal length (aperture range start - end) | 2.8 |
| Focal Length Angle of View | 220° |
Flange Focal Distance ⓘDistance from lens mount to sensor. | 20 mm |
Diaphragm Type ⓘStructure and design of the aperture |  Manual |
Blades ⓘNumber of diaphragm blades in aperture | 8020 |
Zoom Lens ⓘZoom allows you to vary the focal length, change between long shots and close-ups | No |
Closest Focusing Distance ⓘMinimum distance for a subject to be in focus. | 8 cm01500 |
Maximum Magnification ⓘLargest size a subject can be reproduced | 0.11x |
| Autofocus Mode | No |
| Manual Mode |  Yes |
| Manual Focusing Ring |  Yes |
Features | |
Weather Sealing ⓘWeather sealing capabilities will give you more confidence when shooting in unfavourable conditions. | No |
Fluorine Coating ⓘCoating to repel water and oil from lens elements. | No |
| Built In Lens Hood | No |
Teleconverter ⓘA teleconverter (extender) is an extra piece of equipment that fits between the lens and the camera body to enhance magnification | No |
| Image Stabilization | No |
Construction | |
Elements ⓘLens elements refer to individual pieces of glass within the lens. | 10 |
| Groups | 8 |
Bi Aspherical Elements ⓘElements with two non-spherical surfaces | 0 |
Low Dispersion ⓘElements that reduce chromatic aberration | 2 |
Super Low Dispersion ⓘAdvanced elements further reducing chromatic aberration | 0 |
CA Reduction ⓘBuilt-in features to reduce chromatic aberration | 0 |
Internal Focusing ⓘInternal Focusing means that the lens does not change in size during focusing, and the front element does not rotate. |  Yes |