Nikon's Plan 20x finite, NA 0.50

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NikonUser
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Location: southern New Brunswick, Canada

Nikon's Plan 20x finite, NA 0.50

Post by NikonUser »

Yet to make the switch to infinites as I find Nikon's finite are adequate for my work. This tiny moth, Psyche casta, has a strange life history but this is not the place.
Photographed the genitalia with the 20x, on bellows, D810 (full frame), Zerene PMax, as part of my project documenting moth genitalia (often necessary to get a positive ID).
14vii20-1 moth.jpg
14vii20-1 gen.jpg
NU.
student of entomology
Quote – Holmes on ‘Entomology’
” I suppose you are an entomologist ? “
” Not quite so ambitious as that, sir. I should like to put my eyes on the individual entitled to that name.
No man can be truly called an entomologist,
sir; the subject is too vast for any single human intelligence to grasp.”
Oliver Wendell Holmes, Sr
The Poet at the Breakfast Table.

Nikon camera, lenses and objectives
Olympus microscope and objectives

rjlittlefield
Site Admin
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Re: Nikon's Plan 20x finite, NA 0.50

Post by rjlittlefield »

Lovely images!

Admin would certainly not object to hearing more about the life history. A treatise would be inappropriate, but a paragraph or two would be quite welcome.

--Rik

Lou Jost
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Location: Ecuador
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Re: Nikon's Plan 20x finite, NA 0.50

Post by Lou Jost »

That genitalia is beautifully lit. What was the set-up?

Also, is this the the 160mm tube length non-apo objective w/coverslip?

NikonUser
Posts: 2623
Joined: Thu Sep 04, 2008 2:03 am
Location: southern New Brunswick, Canada

Re: Nikon's Plan 20x finite, NA 0.50

Post by NikonUser »

Yes, the non-apo CFN Plan Achromat; the 20x Apo has a whopping 0.75 NA. I do have the 4x CFN Plan Apo.
Genitalia mounted on a slide in Canada Balsam, with coverslip.
I use a 'decapitated' (i.e., objective arm sawn off) Olympus BH2 microscope stand to move the slide in X Y Z axes, transmitted light from flash below slide with light bounced off a white card.
Camera and lens mounted vertically on an old drill stand; BH2 vertical adjustment down to 2 microns
NU.
student of entomology
Quote – Holmes on ‘Entomology’
” I suppose you are an entomologist ? “
” Not quite so ambitious as that, sir. I should like to put my eyes on the individual entitled to that name.
No man can be truly called an entomologist,
sir; the subject is too vast for any single human intelligence to grasp.”
Oliver Wendell Holmes, Sr
The Poet at the Breakfast Table.

Nikon camera, lenses and objectives
Olympus microscope and objectives

Lou Jost
Posts: 4580
Joined: Fri Sep 04, 2015 7:03 am
Location: Ecuador
Contact:

Re: Nikon's Plan 20x finite, NA 0.50

Post by Lou Jost »

Thanks for that info! That's a nice inexpensive lens and you are getting great results from it.

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