Werbung
Verfügbare Sprachen
Verfügbare Sprachen
Fine tuning of your Gehmann cylindrical lens system (art.579):
The system allows you to balance fluctuations of your vision immediately. Please always follow the same
chronological order.
1. Turn knurled ring of the spherical correction very slowly counter-clockwise until getting a slightly
blurred picture, then turn carefully clockwise until achieving maximum clarity.
2. Adjustment of axis: the position of the axis has already been adjusted by you. Please repeat this step,
by now the fine-tuning of the system. Loosen the locking collar lightly and adjust maximum sharpness
through small torsions. Retighten the system afterwards (You seldom have to repeat this step).
In the future you will be able to compensate slight axis rotations through adjustment of both levers
into the same direction, i.e. you have to turn both levers clockwise or anti-clockwise by way of trial.
3. After rough adjustment of the cylindrical value – you had twisted both levers symmetrically or against
each other by increments – it is now enough to adjust optimum sharpness with the help of one lever
and the raster by way of trial. As a consequence of the one-sided adjustment of one lever small axis
rotations are now also taken into consideration.
examples
spherical
-2,5
cylindrical - 1,0
axis
60°
The ray diagram finally shows if all values have been adjusted correctly. You should attach the
ray diagram against the wall. All testing bars have preferably to be black and uniformly shaped.
Adjusted cylindrical values are not correct if the radially-shaped bars are partially black and grey.
The different values can be varied for correction accordingly.
Your CLS is being supplied with a ray diagram, but you can download the target also on our website:
www.gehmann.com
-4-
Werbung
