Accessories On The Herschel Prism; Eyepieces (2" And 1¼"); Bino-Viewers On The Safety-Cool-Ceramic Herschel Prism - Baader Planetarium HERSCHEL PRISM MARK II Instruction Manual

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Table Of Contents

Table of Contents

Eyepieces (2" and 1¼")

2" eyepieces are used as with any 2" star diagonal and are securely clamped by

turning the ClickLock

very solid eyepiece clamp without clamping screws. Any accessories that are inserted

sit securely and are still not scratched! You'll never have to fiddle with small clamping

screws again – instead, simply turn the upper part of the eyepiece clamp by a few de-

grees and the eyepiece is firmly fixed. This is no problem even when wearing gloves!

You do not have to tighten the ClickLock

mechanical principle comes from professional mechanical engineering. This is also how

the tool holder on modern CNC machines works. By clever use of the lever forces, the

tightening torque is increased many times over. The inserted object is held on three sides

as with a quick-action chuck and can therefore no longer perform any tilting movements.

For 1.25" accessories you still need a reducer. We particularly recommend the 2" to

1¼" ClickLock

reducer

Lock

convenience for 1¼" eyepieces, or the Pushfix 2" to 1¼" reducer

only 1 mm height, into which eyepieces can simply be inserted and which has.

Then you can use all 1¼" accessories for which the backfocus fits. If you have

enough backfocus, you can even use the Q-Turret eyepiece holder, which needs about

four centimetres extra backfocus.

Bino-viewers on the Safety-Cool-Ceramic Herschel prism

Due to their large optical length of about 11 cm, bino-viewers usually can't be used

with the 2" eyepiece clamp of the Herschel prism (or with a 2" star diagonal). In com-

bination with one of our bino viewers (MaxBright, MaxBright II, Mark V), the Herschel

prism requires a very large backfocus of about 225 mm (about 110 mm for the bino

viewer and 115 mm for the Herschel prism, plus some focusing reserve depending on

the focus position of the eyepieces and dioptric compensation). In most cases, mo-

dern telescopes have a backfocus of about 150 to 180 mm. The combination therefore

does not come into focus in most cases. You therefore need a glass path corrector

that extends the focal length of your telescope and at the same time compensates for

the colour error of the bino-viewer on fast optics. The overall length of the Herschel

prism can also be reduced by 30 mm by replacing the eyepiece clamp.

The following values can be used as a basis for the necessary backfocus with a bino-

viewer, either with ClickLock

With 2" Clicklock

and 2" nosepiece

With T-2-Adapter +

7.5 mm extension

A 7.5 mm T-2 extension

in place. When using the TQC quick changer, this can be omitted for the GPCs 1.25x

and 1.7x; but the required back focus is only minimally shorter then.

Manual: Cool-Ceramic Safety Herschel Prism Mark II