Roynato
Member

Yes it is a struggle with ISO in this camera. Well, on all bridge cameras with these small sensors I believe.It's been a while for me, Roynato, I can't remember which settings I have for most of those mention you above.
The one I'd mention from that list is ISO. When I first bought the camera I read an article, complete with demonstration pictures, by a photography type organisation, I think based in the United States. They pulled the camera apart and did lots of testing. The article demonstrated image quality degradation at all ISO settings going upwards, when getting past 400 the loss of sharpness is particularly noticeable.
But sometimes there's just no getting around it, you have to let ISO go up a little bit or the subject just comes too dark, specially when I take photos in dense vegetation areas.
Maybe with expensive software there are good workarounds on post processing, but sadly this is not the case for me. I only use the Nikon free software. Some times some de-noise in some free website, but it's rare I use those because the image usually comes back without the metadata, and I don't like that when sharing pics.