Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.

What do the Ph1, Ph2 and Ph3 designations on the phase contrast objectives mean?

April 26, 2017contrast designations mean ph3 phase

0

Posted

What do the Ph1, Ph2 and Ph3 designations on the phase contrast objectives mean?

1 Answer

0

Posted

Phase contrast objectives function with a matching annular ring aperture in the condenser assembly. The diameter of this aperture varies with the NA of the objective being matched. For Olympus UIS objectives, Ph1 signifies objective NA of up to 0.50; Ph2 signifies NA of between 0.55 and 1.0; and Ph3 signifies NA above 1.0 (oil immersion objectives). Long working distance objectives use special-purpose phase rings.