Smartphone app suggestions please.

[P Astrom]

Hi.

Got an Skywatcher 130, newtonian reflector, EQ2 mount and mirrorless DSLR. Problem is that when I am using that setup I usually need a lot of lenses (see pic)IMG_5939.heic

This makes collimation hard to maintain. Also the field of view is quite narrow.

 

Now, I want to take deep sky photos requiring wider field of view and so I got an adaptor for my iPhone. All good. so far but the damn thing won't let med manually manage longer exposures If I put it into night mode I can take pictueres  up to 30 secs but the camera software automatically modifies the picture. I have not found any way to stop this. The 30 sex exposure vs the automatically modified picture:

 

The auto-processed image is probably better for night time photos, but not for astrophotografy. I loose all that beautiful light that was the whole point of 30 sec exposure. 

So please, has anyone found a way to turn of auto processing on the long exposures, or do I need another camera app. If so, what camera app do you suggest?