8kg? thats 16+ pounds ? Whoaw!
As asked it is hard to get a picture in the mind of this hunk of glass , do you have any idea how many lenses are in there ? a laser pointer would give some idea , if it aint Flourite ? ( laser beams pass thru Flourite without leaving a trace ).
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As Orcuimt , asks how big it this , in Diameter and length ?
looks intreguing , the cell looks hand machined , by your Dad , Andrea ? but it has to be nice bit of glass to put that time and effort into it ?
Thanks
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Brian.