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(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 Should fit in. the compartment is 22cm wide at the top, so your lens should have enough space. 

Yes, burde passe inn. it is 22 cm wide on top, so it is objective that should not be allowed. 

Filters are not included in the camera, but in the lenses and the three diameters.