About this product
Model: sharpstar_2.5_flattener
Part Number: 2.5
The SharpStar 2.5" flattener has been designed to fully illuminate a full frame sensor (24x36mm) without vignetting and offers exceptional field correction for f/5-f/9 Refractors.
The fully illuminated field is 55mm and this corrector is thus able to work with sensors larger than 35mm x 24mm.
This Flattener is recommended for use with Focusers larger than 2".
This Flattener has a male M68 thread and will attach to any focuser that uses a female M68 thread. Additional adaptors are necessary for use with focusers that do not have an M68 female thread.
SharpStar have designed this flattener with a long back focus distance to facilitate the use of accessories such as Off Axis Guiders, Filter Wheels etc.
The Optimum Telescope Focal Length is 500mm to 1000mm.
| Focal Length | Recommended Back Focus |
| up to 500mm | 106mm |
| between 500 and 600mm | 101mm |
| between 600 and 700mm | 96mm |
| between 700 and 800mm | 91mm |
| between 800 and 950mm | 88mm |
| between 950 and 1000mm | 87mm |
FEATURES
- Field flattener for f/5 - f/9 refractors
- Full aperture: 61.5mm
- Thread on camera side: M69 female
- Threads on telescope side: M68 male and M63 female
- Fully multi-coated optical surfaces
- Blackened interior for improved reflection suppression
- Recommended distance between camera side thread and focal plane: 91.5mm
- M48 adapter with 36.5mm length included (to create 55mm back focus from adapter to camera sensor)
- Overall Length: 79.7mm
- The recommended distance between the flattener's M69 thread and the focal plane varies depending on the focal length of the telescope. Please see the recommended back focus distances above.
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