Is this normal? (Nikon PA 20/0.75)

Macrero · Post by **Macrero** » Tue Mar 31, 2020 8:43 am

Pau,

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

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=Parnassi ... 80&bih=977

- Macrero

Scarodactyl · Post by **Scarodactyl** » Tue Mar 31, 2020 2:09 pm

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.

Macro_Cosmos · Post by **Macro_Cosmos** » Wed Apr 01, 2020 4:27 am

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.

Macro_Cosmos · Post by **Macro_Cosmos** » Wed Apr 01, 2020 4:29 am

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=Parnassi ... 80&bih=977

- Macrero

Thanks!
Will try and add that to my inventory

Adalbert · Post by **Adalbert** » Wed Apr 01, 2020 6:45 am

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

Macrero · Post by **Macrero** » Wed Apr 01, 2020 7:05 am

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

dolmadis · Post by **dolmadis** » Wed Apr 01, 2020 7:15 am

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

Pau · Post by **Pau** » Wed Apr 01, 2020 7:47 am

dolmadis wrote: Do you mean the OEM version(s)?

BR

John

https://www.ebay.com/sch/m.html?_odkw=& ... s&_sacat=0

dolmadis · Post by **dolmadis** » Wed Apr 01, 2020 8:10 am

Thank you.