Sharpstar Optics 2.5" Field Flattener - FF25L

In mint used condition

This field flattener is suitable for most doublets and triplets from f/5 to f/9. 

Please see the back focus chart for recommended spacing for given focal lengths.

The flattener has a male M68 thread and will attach to any focuser that uses a female M68 thread.  Adapters can be used for other thread sizes.

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. 

Specifications

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

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Please note:
Only accessories listed in the photograph's are included with the purchase unless otherwise stated.

Photographs are taken by ENS and aren't manufacturer stock images unless otherwise stated.

For any specific enquiries then please use our contact form and quote the product id.