Adopting coarse and fine tuning for easy operation and accurate focusing. 

Of course it can be used. But since slides are made of glass, our microscope is equipped with 8 LED lights that reflect light during use. 

Of course, images and videos can be stored on your phone. 

Dear Customer, Thank you for your question. Please check the following steps to setting the focus: (Do not look at too close objects) Step 1. Cover the right objective lens with your hand or close your right eye, rotate the central independent focusing wheel until the image in the left eyepiece is sharp and clear. Step 2. Now cover the left objective lens or close your left eye, rotate the right eyepiece focusing wheel to adjust the diopter of the right eye until the captured image is sharp. 

No. This is manual adapter. I've used it for a vintage Takumar 70-200mm and it worked well if all you want is to mount it and have manual control.