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Is this normal? (Nikon PA 20/0.75)
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Macrero



Joined: 01 Sep 2011
Posts: 835
Location: Valladolid , Spain

PostPosted: Tue Mar 31, 2020 8:43 am    Post subject: Reply with quote

Pau,

no, thank YOU for giving me some task to do in these days/weeks... of house arrest Confused Razz

the Nikon stack took almost 2X more steps than the Oly and result is obviously worse. Not worth using it without coverglass, if one have another, no-coverglass 20X.

Macro_Cosmos,

yep, NA is not everything, especially if you don't use the objective as intended.

Scales are of Parnassius apollo:

https://www.google.es/search?q=Parnassius+apollo&client=opera&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiCq--Ih8XoAhU3A2MBHaD0BpAQ_AUoAXoECBkQAw&biw=1880&bih=977

- Macrero
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Scarodactyl



Joined: 14 Apr 2018
Posts: 329

PostPosted: Tue Mar 31, 2020 2:09 pm    Post subject: Reply with quote

Macro_Cosmos wrote:
Nikon lacks the coverglass, not sure how well it will work with my slides for polarised light.

The DIC rating means that the Nikon is strain-free so polarized light shouldn't pose a problem.
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Macro_Cosmos



Joined: 15 Jan 2018
Posts: 628
Location: Sydney

PostPosted: Wed Apr 01, 2020 4:27 am    Post subject: Reply with quote

Scarodactyl wrote:
Macro_Cosmos wrote:
Nikon lacks the coverglass, not sure how well it will work with my slides for polarised light.

The DIC rating means that the Nikon is strain-free so polarized light shouldn't pose a problem.


Yeah, wish I can afford a good DIC microscope though.

I'm actually not sure how thick the coverglass of my samples are. They were made for me, I don't have the knowledge in chemistry to make those (I should learn though).

The seller has like 30 of these lenses listed at $100 each. It's pretty cheap for what it is. Could make a fun experiment. Too bad the shipping is going to be very jumpy because of the human malware situation. It's definitely worth a try.
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Macro_Cosmos



Joined: 15 Jan 2018
Posts: 628
Location: Sydney

PostPosted: Wed Apr 01, 2020 4:29 am    Post subject: Reply with quote

Macrero wrote:

Macro_Cosmos,
yep, NA is not everything, especially if you don't use the objective as intended.

Scales are of Parnassius apollo:

https://www.google.es/search?q=Parnassius+apollo&client=opera&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiCq--Ih8XoAhU3A2MBHaD0BpAQ_AUoAXoECBkQAw&biw=1880&bih=977

- Macrero

Thanks!
Will try and add that to my inventory Smile
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Adalbert



Joined: 30 Nov 2015
Posts: 1025

PostPosted: Wed Apr 01, 2020 6:45 am    Post subject: Reply with quote

Hello Macrero,
My lens doesn‘t have that.
I have already played a little bit with :-)
https://www.photomacrography.net/forum/viewtopic.php?t=41085&highlight=
BR, ADi
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Macrero



Joined: 01 Sep 2011
Posts: 835
Location: Valladolid , Spain

PostPosted: Wed Apr 01, 2020 7:05 am    Post subject: Reply with quote

Hi Adi,

you mean the spring-system behaviour or the flare/haze in the final image?

Btw, I've had this objective in the past, and I can't recall for sure, but I'd swear it did not behave this way, i.e. the front part retracts, but the rear one stays in place. But my memory may be failing me.

Best,

- Macrero
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dolmadis



Joined: 07 Dec 2011
Posts: 681
Location: UK

PostPosted: Wed Apr 01, 2020 7:15 am    Post subject: Reply with quote

Macro_Cosmos wrote:
The seller has like 30 of these lenses listed at $100 each. It's pretty cheap for what it is. Could make a fun experiment. Too bad the shipping is going to be very jumpy because of the human malware situation. It's definitely worth a try.


Do you mean the OEM version(s)?

or Nikon DIC?

Have you a link please?

Thanks

BR

John


Last edited by dolmadis on Wed Apr 01, 2020 8:09 am; edited 1 time in total
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Pau
Site Admin


Joined: 20 Jan 2010
Posts: 5030
Location: Valencia, Spain

PostPosted: Wed Apr 01, 2020 7:47 am    Post subject: Reply with quote

dolmadis wrote:

Do you mean the OEM version(s)?

BR

John


https://www.ebay.com/sch/m.html?_odkw=&_ssn=silicon_valley_tek&item=372991662645&_osacat=0&_from=R40&_trksid=p2046732.m570.l1313.TR12.TRC2.A0.H0.Xlens.TRS0&_nkw=lens&_sacat=0
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dolmadis



Joined: 07 Dec 2011
Posts: 681
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PostPosted: Wed Apr 01, 2020 8:10 am    Post subject: Reply with quote

Thank you.
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