Using A Telecompressor - Baader Planetarium SUNDANCER II Manual

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Especially on long focal length telescopes, very high mini-

mum magni cations are achieved through the 3x telecentric.

With a telecompressor, the focal length can be signi cantly

reduced again. The SolarSpectrum Research Grade H-alpha

0.4x Telecompressor 2"

SC threads on both sides and can be used both photogra-

phically and visually. Its ideal working distance is 74 mm

with a corrected eld of view of 16 mm diameter.

To screw it onto the T-2 connection thread of the SunDan-

cer II, you need:

1) Reducing-Ring 2"i / T-2a, with 1.5mm optical length

2958244.

2) SolarSpectrum Research Grade H-alpha 0.4x telecom-

# 2459260

pressor 2"

3) Reducing-Ring 2"i / T-2a, with 1.5mm optical length

# 2958244

4) T-2 Conversion Ring

You will need additional adapters to place an eyepiece or a camera in the desired di-

stance. The included focusable 1¼" eyepiece clamp

of 29-35.5 mm. For the ideal working distance of 74 mm you still need a

5) T-2 / 40 mm Extension Tube

On the other hand, for a camera, the necessary adapters depend on the backfocus

of the camera.

The ideal distance will give you a reducing factor of 0.4x. However, the telecompres-

sor can also be used with a shorter distance, in which case the compression factor

changes. Instead of the 1¼" eyepiece clamp, the Baader 2" ClickLock T-2 (M42i x

0.75) clamp

(# 2956242)

Above are the necessary parts to connect the telecompressor to the SunDan-

cer II, on the right they are fully assembled.

Note: The maximum eld of view is limited by the 19 mm aperture behind the etalon;

the telecompressor can only reduce this image circle. As a rule of thumb for the size of

the solar disk, it appears about 10 mm in diameter per metre of telescope focal length.

Therefore with the built-in 3x telecentric, the whole sun disc (with prominences) can be

viewed in telescopes with a native focal length of up to about 600 mm.