Sistema telecentrico TZ-3S SunDancer II

Codice articolo: 79747

Telecentric systems are mainly used in H-alpha filters for solar observation, where the 1/100 lambda plane-parallel etalon in the H-alpha filter requires a perfectly parallelised beam of light over the entire image. These telecentrics deliver very sharp images, but are usually only optimised for the H-alpha wavelength.

This achromatic SunDancer 3x telecentric is designed for the entire visible spectrum and can therefore not only be used on H-alpha systems, but also replace a Barlow lens. Due to the parallel beam of light, it is very good-natured with regard to the working distance: While the magnification factor of a Barlow lens changes with the distance to eyepiece or camera (zoom eyepieces are also based on this principle), the magnification factor and image quality of the TZ-3 do not change, even if the eyepiece is placed way beyond the working distance of the optical design (96 mm behind the base of the T-2-thread). You can also place camera/eyepiece much closer to the telecentric system, but especialy when using an H-alpha-filter, you will then observe not only the sun, but also structures within the naturally grown etalon filter, which are invisible with the correct working distance.

The achromatic SunDancer II TZ-3S illuminates an image circle of 27.5mm at a distance of 96mm from the base body, ideal for the small sensors of modern, fast planetary cameras that require high magnifications for photographing the moon and planets. The contrast is better than with simple barlows or the eyepiece projection often used for high magnifications. With the 3x telecentric system, the high magnifications which are necessary for visual observations can also be achieved with long focal length orthoscopic eyepieces. The interpupillary distance of the eyepieces used does not change either. When using the 2" nose piece, the focus position changes only by 3mm compared to a 2" eyepiece, so that the TZ-3S can also be used on a bino-viewer with T-2 adaption instead of a 2.6x glass path corrector, e.g. to reach focus when observing planets with a Newtonian.

The connection on the telescope side is made via a dual 1.25"/2" nosepiece with safety kerfs (these prevent tilting due to an incorrectly positioned safety groove and at the same time provide a secure hold). On the camera side, the T-2 thread provides a tilt-proof, fixed connection even to heavy cameras or to T-2 eyepiece clamps. For the T-2 thread, adapter rings are available for almost all common connection systems (e.g. M48 / 2"/ M68).

Specifiche tecniche:

Prestazioni
Fatttore di ingrandimento 3
Connessione (lato telescopio)
2"
Connessione (lato opposto)
T2
Rivestimento dell'ottica
BBAR
Foro libero (mm) 27
Backfocus (mm) 96
Filetto per filtro
si

Equipaggiamento
Adattatori cilindrici 1,25"

Generale
TipoLenti di Barlow
Tecnica di fabbricazione Sistema telecentrrico
Materiale esterno Alluminio

Manuale d'uso EN