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Willee
Will using discrimination decrease the sensitivity or depth like on some other detectors?
I don't think it does Willee, at least it shouldn't. Since the CTX does not have an all metal search mode, I think you are hunting in Discrimination mode full time whether you have an open screen or not. When using discrimination, you are rejecting the audio response of a target, not the target itself, so in other words, you have 1500 notch audio filters.
The rejected audio pixels may affect the audio response of the accepted targets though and if you do use discrimination, don't cut yourself too thin on the accepted target range. An open screen will give you the best audio response on all targets and lets you make a better decision whether to dig or not. That is where dual screens comes in handy, one discrimination pattern and an open screen with the push of a button.
I hunt with a lot of discrimination to give my mind a break and check suspect targets with the open screen pattern and a side step 180 degrees.