Appion

nomimal option is also not applied in ctffind4.py

Neil, is there a particular reason for that and/or hiding nominal option in general. From annotation, this has been disabled in the gui for quite a long time now.

One possibility is that if a range of defocus is set during a session, not all should have the same nominal so the option does not seem that useful. I wonder if we should instead consider a "nominal offset" which shifts the zero defocus, and add any database image defocus by that number as that is what happens to instrument.

I forget the history, but I just think I never implemented it. It is likely disabled because I copied the ACE1 CTF page.

If you have a difficult image, you could try manual CTF. This also could be related to my CTF resolution stuff failing on close to focus images, Bug #3438.

This case is actually ctffind3 problem. The search range as input to the program did reach the real defocus, although only barely. However, it did not find it. It may also related to the fact that most images in that session has a fair amount of astigmatism. It appears that the initial search is not even along the input range.

Can this be added to the ctffind4 interface as well? Often seem to be running into this problem on the 2100 too.