TS-Optics 80/352 mm f/4.4 Flatfield Apo with color-free imaging

TS 80 mm f/4.4 6-Element Flat-Field Apochromat

IMAGING STAR apo refractor telescopes from Teleskop-Service have been developed for the dedicated astrophotographer. The objective lens and corrector are optimally matched to deliver the best results both on-axis and off-axis. With an f/4.4 focal ratio, this 80 mm Imaging Star apo offers tremendous light-gathering power. In a direct comparison to an apochromatic telescope with an f/6 aperture, this apo allows you to achieve the same level of saturation in about half the exposure time.

The apo provides a well-corrected and well-illuminated field of view with a diameter of approximately 42 mm. Thanks to the moderate exposure times, noise can be kept to a minimum, which is particularly beneficial for owners of uncooled DSLR cameras. Of course, the apo is also suitable for CCD and CMOS cameras.

Tilting for even better stars at the edges

It is a technical challenge to design an apochromatic lens with 80 mm aperture and this extreme speed of f/4.4, while also providing astrophotographers with a 42 mm field of view. Precisely because of the extreme speed, we have opted against using a clamping mechanism, since clamping can always introduce a slight tilt into the system, which then distorts the stars at the edges. Conclusion: Only a fully threaded connection makes sense. To achieve even better field correction, we´ve also incorporated a tilting mechanism - to ensure even sharper stars at the edges. Using a tilting mechanism at the end of the focuser, you can achieve even better field correction. Even minimal tilts - including those of the camera sensor - affect the image quality with this high-performance telescope. Using the three pull screws and the three push screws at the end of the telescope, you can perform individual fine-tuning to achieve truly outstanding star sharpness from one end of the sensor to the other.

Connecting the camera to the telescope

The camera is connected via the M48x0.75 thread or the M68 thread. The distance from the M48 thread to the camera sensor is exactly 68 mm. This gives you enough space for custom adaptations and for all standard cameras.

To achieve the standard 55 mm working distance, we recommend the TSVF212 M48 extension tube and the M48AbstimmA1 fine-tuning ring. Both items are linked in the accessories section.

The 2.5" rack-and-pinion focuser

The newly designed 2.5" R&P focuser can support even heavy cameras without tilting. It has been specifically designed for photographic use. Adjustment is made via a rack-and-pinion mechanism WITHOUT shifting. The knurled screw at the base locks the adjustment in place, ensuring that the focus position remains perfectly stable for hours. Additionally, you can lock the position of the drawtube using a knurled screw on the upper side.

The focuser holds the 3-element corrector and features an M68x1 Zeiss Level threaded connection on the camera side. Included are the M48 adapter and the M48 tilt mechanism - all fully threaded, of course.

- TS Imaging Star 80 mm f/4.4
- CNC tube rings
- 2.5" rack and pinion focuser with M68 connection
- M68-to-M48 adapter
- M48 tilter
- Carrying case

Safety informations: PDF Download