Thank you Dave, I saw your video regarding Barrow lens to increase the working area on the microscope and I had the task to install one on mine.
Well, today after coming back from my trip to China I installed a 0.75X barrow lens on my microscope and I'm happy with the results !
Also I'm happy with the savings, the price of the barrow lens here in the USA is $100.00 USD, the price in China was $50.00 USD, half of the price.
David.