Hello, our microscope objective has three magnifications: 4X, 10X, and 40X. The microscope objective can be disassembled or replaced. To be honest, we do not recommend you to do so, because disassembling the objective lens by yourself may contaminate or damage the objective lens, damage the structural stability of the microscope, and shorten its service life. 

The binocular shell is made of environmentally friendly, odorless rubber material. The surface of the binoculars is nicely matted and effectively prevents slipping. 

(1)Please check to make sure you have installed 1.5V 6*AA battery. Do not use inferior batteries as their voltage is lower than 1.5V. (We recommend brands like Energizer, Duracell, AmazonBasics, etc.). (2)Make sure the polarity is correct and the contact with the spring is normal. (3)Press and hold the power button for at least 3 seconds to power on. (4)If it still cannot be turned on after 1-3 steps, please try to use a power bank. 

Yes, the outside diameter of the objective lens is 52mm. 

Yes，the images are very clear on this model and mine is well made.