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The T490B features a unique "simul-focal" optical system with an adjustable trinocular port to enable well-focused clear images on your computer or video screen while simultaneously obtaining sharp, focused images through the eyepieces.
The performance of this piece of equipment exceeded my expectations. I have 22 years of experience working in biological research laboratories. This Amscope with the 5MP Omax camera performs better than other microscopes I have used which were 20 times the cost. I purchased this for personal use in my home for amateur microscopy. The camera works nicely in my telescope as well.  I plan to have fun projects for my 18 grandkids when they visit. They will be able to print out the images from a multitude of observations. -Ted