HP ACC2 Aurora User Manual download pdf (Page 30)

CHAPTER 15 FOCUSING:

One of the drawbacks of a digital camera with no analog output

is the difficulty to focus it. The Unis/UiO cameras consist

of three adjustable lenses for focusing.

1) Front fisheye lens:

This should use the UV filter setting in the lens filter

setting. (MARK: This is not the interference filter wheel,

630.0nm, … .) This UV filter is marked with white characters.

The other filters are marked with yellow or red characters.

The lens settings in the front fisheye lens should be set fully

open (f-stop to f4) and focused to ∞ .

2) The middle lens:

This is the filter re-imaging optics, CANON camera lens in

front of the image intensifier.

As with the other lenses it should be set fully open (f-stop ,

f0.95). The focus of this lens has to be adjusted.

3) The bottom lens:

This is the intensifier re-imaging optics. This is the NIKON

camera lens in front of the CC200 camera head.

As with the other lenses it should be set fully open (f-stop,

f1.2). The focus of this lens has to be adjusted.

… … … … … … ...

Only the PMIS program is used when focusing the camera.

The user knows from the experience with the sequence files

the best settings for the image intensifier gain and exposure

time for the various filters (and for the open filter). When

focusing towards stars (or planets) the filter settings with

open filter should be used, then a shorter exposure time must

be selected.

One person should watch and control the computer while the

other person turn the lenses in the camera hut.

The focusing can be done as:

user->comopen->1

user->filterwheel->1

user->initgain->1

user->initpower->1

user->shutterctrl->1

Be careful now, no lights in the camera hut. The intensifier

is now continuously exposed to light and could easily be

damaged.

Then in the Image_1 window:

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HP ACC2 Aurora User Manual Page 30