Hi bettyswolloks and everyone who joined to this discussion,
I think that is the case as Bettyswolloks has put it;
Using pentax K7 it is not possible to switch off the Noise Reduction future although in menu items it is exist.
I think it is very strange having such menu items for K7 as if switching off Noise Reduction is possible but in fact this is not the case.
Thanks for everyone for the contribution.
Regards.

Yes you are right.There are three relevant items for NR.
But I did not mention the one Item #20. Since No 1 is choosen for that item as factory value and I did not changed that option at all.In case of 1 is selected which mean "noise reduction is activated when ISO sensitivity is set to higher than 800". I never used ISO value higher than 400 during my studies.
To be more clear: when item #18 is selectred as 2 means:"noise reduction will not activate when using a slow shutter speed" is the explanation what I see on LCD screen.In case of item 19 is selected as 4:the explanation on the screen"noise reduction will not activate when using a high ISO sensitivity."
I dont know about 'Dark Frame Subtraction' feature.But what happens after long exposure (for example 30 minutes) ended by me, K7 still works for about another 30 minutes(some noise inside the camera)and camera is not ready to take another photo during this time.
I hope I am clear enough.
Regards.

My recent attempts to take star photos during night with long exposure(bulb) was OK.But the problem is ıt was not possible to switch off the "Noise Reduction" function.Among the K7 camera menu items under the tab "c" #18 and #19 are for Noise Reduction.I have changed these values from 1(which are factory values) to 2 and 4 to swich off to NR function but it doesnt function at all.
If somebody could help me how to escape "Noise Reduction" when it is required
Regards.


I.Erturk