You're fighting a losing battle -- too many degrees of freedom between the loupe's position, the phone's position, and focus. I'm surprised you were able to do as well as you did, but the only way you're going to get usable photos with this approach is through luck. Can you find a way to hold the loupe against the phone, maybe with a spacer, so it stays in a fixed position? Can you put the phone on top of something stable (a heavy box) so that it stays put?
You can buy a pretty good macro camera for next to nothing on ebay. You did not do fabulous. It is still impossible to see your coin when it is out of focus.
I agree it is so hard taking pictures with phones or tablets look at all the posts of my coins I have taken... -.- horrible mine are
I want to see YOU do better with a PHONE not a macro camera use a phone and let's see how good YOU do I mean seriously stop harassing him if he wants to use a phone let him.
He did not do fabulous, because HE choose to use a phone. Might have done the best with what he used, but he still decided to use a crappy camera.
I have a great digital camera. 2 actually. Takes beautiful pictures. If they just had bluetooth capabilities to get them from there to my phone it would be great.
I'm not really up on iPad equipment but it looks like you can get a USB to iPad adapter on Amazon for about $8.