Aslan

Thank you sincerly for your comprehensive explanation.

I understood what the test was for but the origins of it's use and development are very interesting.

Obviously there are some cctv proffesionals out there like myself who will have learnt a little more than they thought they already knew.

10 out of 10 for the engineer who remembered Rotakin testing.

I just couldn't remember I'd had alsorts of phrases running through my mind and the nearest I got was Retsoscan which is realy nothing like.

Thanks for your answer. Now I can start tyo sllep at night. LOL

Does anyone know what the function of setting up and testing cameras and monitors is called, where by a target figure is set up at specific distance and the system calibarated to fine tune the results. Have you been involved in such set up's?