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100X objective tests

 
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Olympusman



Joined: 15 Jan 2012
Posts: 4271
PostPosted: Sat Jan 05, 2019 7:28 pm    Post subject: 100X objective tests Reply with quote
Testing 100X objectives on a metallurgical scope.

First a baseline 40X stack



100X dry objective



And the big surprise - 100X oil objective


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Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA
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rjlittlefield
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Joined: 01 Aug 2006
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Location: Richland, Washington State, USA
PostPosted: Sat Jan 05, 2019 7:38 pm    Post subject: Reply with quote
Is the oil objective used dry here?

--Rik
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Lou Jost



Joined: 04 Sep 2015
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PostPosted: Sat Jan 05, 2019 8:00 pm    Post subject: Reply with quote
Can you be more specific about which objectives/tube lenses you are testing? Thanks.
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Olympusman



Joined: 15 Jan 2012
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PostPosted: Mon Jan 07, 2019 10:21 am    Post subject: Objective test Reply with quote
I should have put the specs of the objectives in the original post, which I will do from now on. The objectives are:

NIKON MPlan 40 0.65 210/0

The dry 100x objective may have come with an Amscope kit.

100/1.25
160/0.17

The 100X oil is a SWIFT objective that I have previously tested against my other oil objectives in transmitted light microscopy. This was the first time I tried it on a metallurgical scope with immersion oil and am very impressed by its performance.

SWIFT S-MICRO
100 1.25 Oil
160/0.17
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Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA
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Pau
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Joined: 20 Jan 2010
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Location: Valencia, Spain
PostPosted: Mon Jan 07, 2019 10:47 am    Post subject: Reply with quote
Quote:
The dry 100x objective may have come with an Amscope kit.
100/1.25
160/0.17

NA 1.25 is an oil immersion objective for sure. The maximum NA attainable in air is 0.95 (and with water immersion 1.2, I think).
Not surprising the bad results without oil
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