Hello DJ L., thank you for your answer, I was on vacation for some days and was not able to swiftly check out your reply.
I have actually found solution that produces clear images but the way to get those images seems quite strange.
If one loads the default profile for CCIR cameras "Mode" is set to "Frame" and "First field" to "Odd", Interlaced is switched on. this produces the above mentioned error. Switching the "First field" to "Even" does not change a thing.
If you change "Mode" to "Field" AND "Aquire Field" to even, one gets a clear image (not depending on the settiung of the "interlaced" checkbox) which is 2 times wider than it is high.
If you now restore the settings to "Mode"="Frame" and "First field"="Even" I get a clear and undistorted image even though the same settings did not work before.
Strange, isn't it?
Thanks for your help
Falk
ps:I have also sent an email to sensors unlimited to see what they suggest.
pps: NI-IMAQ version is 3.5 (at least thats what readme.rtf in the "Documents" folder says)