I just got my first smart phone,a free unit given by the company to keep my bussiness,but even not being a very expensive phone(lenovo moto g5s),the camera has surprised me definition...So i am in the process of adapting the phone to my kowa 823 and one think i can tell you is that It takes a bit of time to test the scope ,eyepieces and phone arrangement to get the best possible results ..There are many variables and sucess is not guaranteed ..!
For instance ,I use my Kowa ,usually ,with a Baader Hyperion zoom .Great zoom ,wide angle ,sharp..but..I havent been able to find the right distance /angle/magfication or camera setting to avoid vignetting to a usable degree,..I didnt put lots of time doing this,but first attempts were frustrating enough to make me move on..My second move was to change eyepiece and now i am testing a fixed 12 mm ED astro eyepiece(BST explorer) for 38x and the results are quite better..playing around with a modified digiscoping universal adapter,the baader microstage II, I am starting to get some results..I can find the distance to get the camera in photo mode,clean of any vignetting ,only zooming to 1.4x and video without any zooming..but i had to fiddle a bit and the rig is not very stable..I wont reccomend this way as-is,is gonna take some modification and customization to get results..I also need a low power eyepiece to get a more bright, stable view(..i sold my kowa 21x wide eyepiece ,and that is precisely what i need)..
I have seen some universal phone adapters,not a lot of models to choice really...most of them so similar amd based on the same principle,so i guess i am going to make my own and see how it goes..I am now thinking that i might use LEGO pieces to make a craddle and modify my adapter...should be fun..
By the way,I lived in Oregon few years ,and Astoria,very nice town by the way,Is situated in an amazing area for birds,with the Ocean and the mighty Columbia ,plenty of forest,marshes,mud flats and you name how many habitats..It is really full of wild life and god i miss it when i talk about it!
Good luck