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Why Purchase from All-Star Telescope?
Free Expert Support
Whether you are a first timer needing help with setting up or an enthusiast that can't quite make that one thing work, our expert staff are ready to support your needs. With decades of knowledge and first hand experience we've been there and we can help you through it!
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Product Description
The 1.0x flattener does not change the native focal ratio-the Askar 80ED remains at f/7.
The Askar 80ED 1.0x flattener features a triplet lens design, including one piece of ED glass, optimized for the APS-C frame. It weighs 0.42 kg. The back focus is a standard 55mm from the M48 threaded surface.
The flattener corrects field curvature and coma, resulting in a flatter field and sharper, rounder stars at the edges.
Installation Instructions
Specifications
| (After attaching) 80ED Focal length | 560mm |
| (After attaching) 80ED Focal ratio | f/7 |
| Lens Number | Triplet design (including one ED glass) |
| Image circle | APS-C |
| Back Focus | 55mm (from the base of M48 male thread) |
| Weight | 0.42kg |
| Rear-end thread type | M54x0.75 and M48x0.75 (M48x0.75 filter thread inside) |
Optical Path
SPOT Diagram
Longitudinal Abberation
Relative Illumination
