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This ZWO 2.5mm C-type lens produces a nearly 170-degree field of view and works well as an all-sky camera when used in conjunction with cameras that have a 1/2" sensor, such as the ASI178MM, ASI178MC, and ASI185MC. It's perfect for getting all-sky images of the Milky Way, auroral activity, and meteor showers. The wide-angle fisheye design enables extreme wide-field astrophotography with minimal vignetting on compatible ZWO cameras.
| Mount type | CS |
| Field of View | 170° |
| Focal length | 2.5 mm |
| Compatible Sensor Size | 1 in |
| Compatible Camera Models | ASI178MM, ASI178MC, ASI185MC |