Swift Objective Lens Question

[hepster]

I am considering purchasing a Swift microscope with a 4xD, a 10xD, a 40xRD, and a 100xRD (oil) objective. Can someone kindly tell my what the D and RD mean? Thanks in advance.

[Charles]

I would think D is for DIN and RD is for Retractable DIN. Retractable in that the tip will retract into the barrel when the tip touches the slide.

[hepster]

I would think D is for DIN and RD is for Retractable DIN. Retractable in that the tip will retract into the barrel when the tip touches the slide.

Thanks. I gotta lot to learn.

[apochronaut]

The Swift objectives that were supplied out of Japan at one time actually had D.I.N. painted on the barrels. I suspect Charles is correct . They just abbreviated.