GRASS VALLEY Focus 70 Live, User Manual

Page: 44 / 112

44 Focus 70 Live Highly Affordable HD System Camera User’s Guide (v1.1)
Chapter 4 - Operating instructions
4.7.5 Focus assist
The focus assist function can be switched on or off in the
OPERATOR TOOLBOX
menu. This
function adds a motion effect in the viewfinder to objects in sharp focus. The FOC+ indicator
in the viewfinder lights when this function is on.
4.7.6 Viewfinder zoom
The viewfinder zoom function is another feature that helps you focus. This function enlarges
the center of the viewfinder image. The VTR button on the lens can be set to operate the
Zoom function in the
OPERATOR TOOLBOX
menu.
When the viewfinder zoom function is in use, the viewfinder markers are switched off to
improve the clarity of the display. The
Zoom indicator in the viewfinder flashes when the
viewfinder zoom function is active.
4.8 Lens operation
4.8.1 Back focus adjustment
When you fit a lens to the camera you may need to adjust the back focus. Refer to the lens
manufacturer's instructions to find out how to do this. The
LENS
menu allows you to choose
and, if necessary, adjust other parameters to suit your lens type and your personal
preferences.
4.8.2 CLASS
The Chromatic Lens Aberration and Sharpness Solution (CLASS) compensates for chromatic
aberration by using lens data. Most major lens manufacturers support this feature.
☞
Note
☞
Note
Make sure that the lens interface is set to Digital in the
CONFIGURATION > LENS > LENS SETTINGS > LENS IF TYPE
menu.
When a lens is attached to the camera for the first time, the camera reads the lens data at
startup. This is done only once and may take some time to finish. Reading the lens data is a
background process and does not influence normal camera operation.
Some lenses also require a manual calibration of the lens ring positions. If this is the case, a
message (“CLASS: Turn lens rings”) is briefly shown in the viewfinder. Turn both zoom and
focus ring all the way from one end to the other.
After startup when CLASS is active, a message (“CLASS: Active”) is shown in the viewfinder.
☞
Note
☞
Note
In the (very rare) occasion that lens aberration data becomes corrupted, a reset of the lens data
can be forced:

Go to the
CONFIGURATION > LENS > LENS SETTINGS > CLASS > RESET CLASS DATA
menu
and select Start .