Actually, great point! I'm glad you asked. I was using spacers with the Steadypix but I just realized those came with the other smartphone adapter I own -- the Celestron NexYZ. But I use those spacers with both.
The NexYZ is a somewhat better adapter, but it's significantly heavier and bulkier which can be an issue sometimes. One advantage the NexYZ has, though, is you can adjust the distance between the eye lens and the camera lens. I noticed last night that the camera was too far away from the 40mm eyepiece cutting off a significant amount of the field. Not enough eye relief. I could barely get the whole moon in. Obviously it depends on the eye relief with the particular eyepiece you're using.
There are trade-offs for both adapters. That's why I have both. (And, yes, sometime I attach them to the diagonal instead of the eyepiece itself when necessary.)
Here are the NexYZ spacers I was using last night and the set up with the Steadpix EZ.
lol. glad i asked. that looks like a great setup but a little much for me to get both those adapters.
i am going to think about this, but may have to try the nexys so i can do it with all my eyepieces.
