I have used 20mm and 22mm lenses on the clinical EXC-350 and both pairs were available for this microscope. These 23mm eyepiece lenses are definitely more comfortable and a bit sharper. Peripheral light shields for the eyes, nicely made, serve well in those moments when there are motile bacteria in the dark field. Overall, the design and build quality are top-notch. I think the design is more durable than standard builds. When I ordered them I knew there was no fixed zero setting mark on the body of the assembly. This point is easy to find and mark manually. In terms of value, compared to standard eyepiece lenses, this is one of those rare exchanges where I feel like I got more than I paid for.
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