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Objective Designations

 
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geetee50



Joined: 06 Mar 2012
Posts: 91

PostPosted: Wed Jun 13, 2012 11:19 am    Post subject: Objective Designations Reply with quote

Hi i wonder who can put me right. I see on a well know auction site many objectives being sold as Plan with PL as its designation, in my understanding PL was positive low but Pl was plan or Flat Field optical correction, this info is from a Nikon site. http://www.microscopyu.com/articles/optics/objectivespecs.html

I have a Leitz PL FL 10 that i've seen being sold as plan, so is the PL designation for Nikon objectives only or are these being miss sold at auction.

Gary
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Doc.Al



Joined: 24 Jun 2010
Posts: 80
Location: Suffolk, England

PostPosted: Wed Jun 13, 2012 12:08 pm    Post subject: Reply with quote

Hi Gary,

With Olympus phase contrast objectives, the PL designation is for positive low (PL) contrast. There was also PLL (positive low-low), NH (negative high) and NM (negative medium) objectives from Olympus. The Nikon phase contrast objectives are usually marked DL.

With the Leitz older objectives, Pl Fl means Plano (or plan) fluorite, which indicates flat (or plan) field of view with fluorite glass.

So your Pl Fl 10 lens is a Plan lens.

Hope this helps

Alex
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Nikon Labophot 2 with CFN objectives.
Canon MP-E65 and StackShot
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geetee50



Joined: 06 Mar 2012
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PostPosted: Wed Jun 13, 2012 2:35 pm    Post subject: PL FL Reply with quote

Cheers Alex,

I see at the bottom of my link the Abbreviations: PL FL, Plan Fluorite

So on its own PL is positive low when it is a Phase Contrast lens, but on any other lens it's plan? that makes sense Confused

thanks
Gary
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Pau
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Joined: 20 Jan 2010
Posts: 4951
Location: Valencia, Spain

PostPosted: Thu Jun 14, 2012 7:53 am    Post subject: Re: Objective Designations Reply with quote

geetee50 wrote:


I have a Leitz PL FL 10 that i've seen being sold as plan....


Usually Leitz fluorite (semiapo) objectives are labeled as "Fluotar", not FL, and fluorescence specialized ones as "Fluorescenz". Pl means Plan with a FN up to 28 mm if the lens isn't very old.

Could you provide a picture of the objective showing its writings?

More info at

http://www.photomacrography.net/forum/viewtopic.php?t=12239&highlight=npl+fluotar+neofluar
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geetee50



Joined: 06 Mar 2012
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PostPosted: Thu Jun 14, 2012 10:12 am    Post subject: designations Reply with quote

ok thanks.
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Pau
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PostPosted: Thu Jun 14, 2012 11:12 am    Post subject: Reply with quote

Yes, it's an old style plan fluorite.

It will be good (or very good) in a Leitz microscope paired with Periplan eyepieces, but because it needs complementary corrections in the eyepieces it would be poor if used alone in a bellows setup
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geetee50



Joined: 06 Mar 2012
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PostPosted: Thu Jun 14, 2012 2:55 pm    Post subject: Reply with quote

Thanks Pau, Yes very poor, is there a way of correcting it for bellows use?
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Pau
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PostPosted: Fri Jun 15, 2012 3:55 am    Post subject: Reply with quote

In short: no

You would need to place the adequate Leitz Periplan eyepiece inside the bellows at the right position and a relay lens between the eyepiece and the camera, i.e. making a compoud microscope. Possible but not to be recommended,

If you do not own or plan to get a Leitz microscope the best option will be to sell it and to buy an adequate objective like the Nikon CF
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