Teleskop Service 2.5" Flattener for Refractors
TS Optics Field flattener and -corrector for f/9 - f/9 refractors - 61.5mm free aperture. Delivers exceptional field correction for all refractors combined with large camera sensors.The TS 2.5" flattener's advantages:
Many refractor correction lenses are not able to illuminate even medium-sized sensors without vignetting or other abberations. For this reason, Teleskop-Service has designed a 2" corrector with very good characteristics and which has proven high-level results with many systems: Link to the 2" Flattener by TS
The bigger 2.5" flattener by TS offers the same characteristics but is able to deal with even bigger sensors. Compared with 2" (or smaller T2 systems), this flattener can illuminate full-format (24x36mm) sensors even with fast refractors without vignetting. The corrector is suitable e.g. for the following refractors:
All systems with a focuser bigger than 2". For all relevant makes, we offer adaptions: Starlight Instruments Feather Touch, Astro Physics, William Optics, Astro Professional and TS Apos. The photographic speed may be between f/5 and f/9.The 2.5" flattener offers generous back focus:
Like the smaller 2" version, we have designed this flattener with a wide back focus distance. So it is no problem to add Off-Axis-Guiders, filter wheels etc. The recommended distance between the flattener's M69 thread and the focal plane is 91.5 mm for lenses with f/7 and slower.
The TS field flattener has deliberately been designed without focal reduction:
- For f/6, we recommend a distance of 106 mm.
- For f/5.5, we recommend a distance of 111 mm.
By concentrating of pure removal of field curvature, an exceptional result has been achieved without secondary abberations like coma or astigmatism. Additionally, the flattener is not limited to certain telescopes or focal lengths. It is universally usable for nearly any refractor from f/5 through f/9.Technical details:
- Field flattener for f/5 - f/9 refractors without influencing the focal length
- Free aperture: 61.5mm
- Threads on telescope side: M68 male and M63 female
- Thread on camera side: M69 female
- Recommended distance between camera side thread and focal plane: 91.5mm
Teleskop Service Product Number: TSFLAT2.5