Hi i was wondering if you would be able to help ? We bought our 10 year old a celestron 114 telescope for his birthday .when we lined up the star in viewer last night and could see it then inserted the 10mm eyepiece all we could see is grey but without it was clear to see. We have googled possible cause and it says it needs calibrating but as we know nothing about them wondered if you could direct us to someone we can pay who could do this for us please as my son is upset it is not working many thanks my mobile number is 07804 779449 sam