Why is one image spotty?

These two shots of the moon are taken one after the other. The only things I changed were the f stop and the shutter speed. Can anyone please help and tell me why the second picture has spots on it and the first one doesn't?
Settings for the first shot: f5.6, 1/6400, ISO 400, 140mm
Settings for the second shot: f36, 1/50, ISO 400, 140mm
I've noticed before that sometimes the higher the f stop I use the more spots I have on the resulting image.
I was going to say are they birds coming into shot on the second image, but now I'm zoomed in I'm not so sure that's the case. They look a little blue. Send strange. Surely your camera settings wouldn't cause this.
posted December 1st, 2017  
Seems strange. Not send
posted December 1st, 2017  
@paul10 Yep, not birds. All the images on f5.6 have no spots and all the images on f36 do have spots. I didn't realise until I downloaded this morning otherwise I would have tried different settings for comparison.
posted December 1st, 2017  
Might want to have your camera cleaned. Looks like dirt spots to me. Maybe they just don't appear when your shutter speed is so fast?
posted December 1st, 2017  
https://photo.stackexchange.com/questions/82681/black-spot-on-image-while-shooting-with-high-aperture

I just goggled it and found this answer with the same kind of problem when using a smaller aperture. Might be worth checking out.
posted December 1st, 2017  
Good to read the comments! I had spots on the camera lens too and now I make sure its clean before I take any photo!
posted December 1st, 2017  
@irisn Thanks Iris - looks like I need to find someone to clean my camera.
@paul10 And thanks again Paul, for your help - that Google link is very helpful. I probably should have thought to Google myself but my first thought was to ask the 365 experts!
I also posted this image on the discussion page so have got some good info from that too.
posted December 1st, 2017  
@nickspicsnz. No worries. My first thought when I have a problem is 365 😊 Hopefully you'll get your answers soon and whatever the problem is it isn't anything major.
posted December 1st, 2017  
I was going to say what @irisn said... Progear do an excellent cleaning service.. Pm me for details...
posted December 1st, 2017  
Cool picture. The second picture shows dust spots on the lens or sensor. High apeteur number with a clear background will bring them out. I use that technique which was recommended to check dust on lenses and sensor.
posted December 1st, 2017  
I have favd for future reference :)
posted December 2nd, 2017  
I was going to say UFO's, but I think I'll keep quiet 🙂
posted December 2nd, 2017  
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