TS-Optics 3" Wynne Newtonian Coma Corrector with improved illumination

Teleskop-Service has commissioned the well-known optics designer to develop further the proven Wynne coma corrector design. The problem of all Wynne correctors is the illumination. Due to the length, the field lens of the corrector vignettes. Thus 3" Wynne correctors even do not achieve 30 mm fully illuminated field at f/4.

The result of this development is the TS 3" Wynne corrector with significantly illumination and, at the same time, outstandig sharpness over the field. Thus cameras with full frame format sensors and even large format sensors can be used. Simultaneously, we were able to increase the working distance to 65 mm for making possible to use nearly all common CCD and DSLR cameras. In this case, the working distance corresponds to the distance between the vertex of the last lens surface and the sensor (in other words: the back focal length), and it is largely independent of the telescope.

Here are the working distances, calculated directly by Massimo Riccardi

• 250/4 ------- 64 mm
• 250/5 ------- 64.4 mm
• 300/4 ------- 65 mm
• 300/5 ------- 65.2 mm
• 400/4.5 ----- 65.8 mm

These values are very close to each other, which explains why a single distance of 65 mm is sufficient in practice without loss of quality.

The adaptation of the corrector to the telescope

The corrector has a 3" housing, so any focuser with a 3" ring clamp can clamp it. However, many astrophotographers prefer a screw solution and the generous working distance of 65mm allows this as well. The prerequisite is that the focuser has an inner tube with at least 76 mm diameter. We offer suitable adapters with which the corrector can be recessed into the focuser tube, for example for focusers with the M82x1 internal thread on the camera side.

• M82-M68-M48 ... Optically effective length 9 mm - transition to M48 thread
• M82-M68-M68 .. Optically effective overall length 9 mm - connection on camera side M68x1

An overview of the advantages and features of the TS 3" Wynne corrector:

• Through the short construction of less than 100 millimeters, the illumination is significantly improved, compared with other 3" Wynne correctors.
• The corrector fits directly to 3" receptacles of focusers - the adaption is very simple.
• Through the practical M68 connection thread, screw connections with the focuser via custom adaption are just as possible as directly attaching of our M68 adapter range, like our M68 off-axis guider.
• The corrector is at least equal to conventional long Wynne correctors.
• A high-quality multi-coating is applied to every lens. Even with bright stars, no refections or ghosting will appear.
• The body is CNC machined and offers a neat internal blackening.

Features:

• Type: Wynne 3" Newtonian Coma Corrector
• Number of elements: 3 lenses - 3 groups
• Telescope side connection: 3" connector (76.2 mm barrel), M72x0.75 male thread
• Connection to camera: male M68x1 thread - thread length 4 mm
• Length: 99 mm (without male M68 thread)
• Working distance:v65 mm from the lens surface or 64.5 mm from the M68 thread
• Illumination: full illumination up to 45 mm, 90% illumination up to 55 mm diameter
• Correction: very good field correction up to 55 mm diameter
• Change of focal length: no change of focal length
• Focus position: the corrector moves the focus position 17.5 mm more far away from the tube
• Weight: approx. 600 g