digital zoom. 

Hi， this tripod has a 1/4 screw mount. it is not compatible with the 2-1/4" twin-lens reflex cameras. 

yes you can stack the adapters and do that. 

this solar camera have 4X digital zoom. 

Yes and no. Using motion detection it doesn't work through a window. However.... using the timer inside it you can record through a window using it. How? Set the timer to record 4 minutes every 5 minutes for 1-5 hours or whatever time you need it to record for. This is what I do- just make sure you have a SD card with enough memory for the videos- I use a 32 GB SD card, I use it though a window as a security camera for my car....I live in an apartment so I can't hard wire anything and this works great for what it is.