Digiscope adapter?

[Overdrive]

This is the one I use, it's universal and very adjustable for different phones and spotting scope eyepiece sizes. Found it on Amazon for $15 works great for what I need.

 

[EJDXT21]

I have this one. works with my iphone 10max in a case. Its heavier than some of the other options but it works well.

https://www.amazon.com/VEO-PA-65-Universal-Digiscoping-Smartphone/dp/B083QSD8HQ/ref=sr_1_3?crid=3LNNLSDBQJTB1&keywords=vanguard+phone+adapter&qid=1655605184&sprefix=vanguard+phone+adapte%2Caps%2C173&sr=8-3