On many fast refractors and bigger cameras normal fieldflattners reach the limit for fieldcorrection and illumination very quickly.
Many modern refractors have bigger size focusers, but till now nobody , excapt William Optics , have had a universal working fieldflattner of bigger size then 2“, that time is now past!
2.5" Field Flattner - Universal Field Flattening Lens
Export Price for NON-EU customers: 250,00 € ( about $ 350 )
Universal 2.5" flattner for f/5 up to f/9 refractors
2" or T2 flattners are to small for big CCD cameras. This new 2.5" flattner has a open aperture of 62mm. It allows you to use big CCD cameras (for example 24x36 mm) at fast f/5 refractors. The distance between flattner and CCD sensor is 91.5mm - so you can use accessories like filter-wheels or off-axis-guider without problems.
This is only a flattner, there is no reduction of the focal-length. You can use the flattner at f/5 up to f/9 refractors.
Certainly you need a focuser, that is big enough for this flattner. We offer ready-to-use adaptions for big focusers of Baader and Starlight Instruments. More adaptions will follow.
- for f/5 up to f/9 refractors
- open aperture: 62mm
- M68 male- and M63 female-thread at telescope-side
- M69 female-thread at camera-side
- distance between flattner and camera sensor: 91.5mm
Place your order now, come and see and take it away from NEAF at the APM-America booth