AAton XTR - Attaching the Extension Finder; Viewfinder Tension Adjustments

the hyperlong finder can be used.
Note that standard short eyepiece can be equipped with a heating
system, as well as 250mm eyepiece extension in order to avoid any
condensation on the eyepiece lens. Aaton can provide you a heating
lens (neutral, + 3 or - 3 diopters) and the corresponding cable.
2.2.2 Attaching the Extension Finder
In order to use an extension finder on the XTRprod, the standard
eyepiece must first be removed. To remove the eyepiece, locate the
eyepiece lock ring, marked A in the photo below. Rotate counter-
clockwise and gently pull off the eyepiece. To install the extension
finder, locate the protruding guide pin on the seat of the viewfinder
and align the pin with the hole in the flange of the finder. Mate the
flange to the seat of the viewfinder and tighten the lock ring until it
is set firmly in place. During this procedure, you will notice that the
extension finder needs to face 180° away from the operator’s eye to
be installed onto the viewfinder. Because of its optical construction,
this is completely normal. After installation, rotate the finder 180°
to regular viewing position.
2.2.3 Viewfinder Tension Adjustments
The large knurled knob at the base of the left/right lateral move-
ment point (b) locks the lateral positioning.
The friction adjusting ring, located behind the eyepiece lock ring,
can be used to adjust the tension of the eyepiece swivel, depending
on the operator’s preference and the viewfinder being used. When
using the standard eyepiece, tension should be relatively light to al-
low for movement with a moderate amount of pressure. When using
the standard extension finder, tension should be increased to hold
the additional weight of this finder in place.
To adjust the tension of the swivel, loosen the friction adjusting ring
(c). Hold the eyepiece in place, rotate the adjusting ring slightly.
To increase tension of the eyepiece swivel, rotate the adjusting ring
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