Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

Have a problem finding shops that sell specific materials? Ask here. Are you looking for microscope parts? Do you have anything to offer for sale? Note: this is not a section for external companies to advertise their products.
Post Reply
Message
Author
Matador
Posts: 48
Joined: Sun Apr 25, 2021 4:55 pm

Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#1 Post by Matador » Sun Apr 25, 2021 9:40 pm

Hi,
I have a Zeiss Axioskop 50 equipped with a Plan-NEOFLUAR 1,25x/0,035 infinity/- objective.
The skope is equipped with a Zeiss achromatic-aplanatic condenser 0.9 Ph DIC (44 52 41). PICS of my setup below
The problem is that I cannot have correct illumination of whole field of view when using the Plan-NEOFLUAR 1,25x objective.
The Zeiss axioskop manual states that I need to use a 1.25x auxiliary lens that fits inside the turret of the phase condenser to have full field of view illumination when using that 1.25X objective.

I am looking to buy a Zeiss 1.25x Auxiliary Lens. Part number is Zeiss 44 52 65.
I think the mounted auxiliary lense has a total diameter of 24 mm (including the ring where the lens is mounted, but I have never been able to find a picture of the Zeiss part 44 55 62 (only found the part refered to in the Zeiss Axioskop manual).
Axioskop manual.JPG
Axioskop manual.JPG (205.42 KiB) Viewed 5549 times
Please let me know if you have this part for sale,

Thanks in advance,
Matador
Axioskop 50 - 001.jpg
Axioskop 50 - 001.jpg (94.3 KiB) Viewed 5551 times
Axioskop 50 - 005.jpg
Axioskop 50 - 005.jpg (93.51 KiB) Viewed 5551 times
Axioskop 50 - 008.jpg
Axioskop 50 - 008.jpg (96.87 KiB) Viewed 5551 times

Matador
Posts: 48
Joined: Sun Apr 25, 2021 4:55 pm

Re: Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#2 Post by Matador » Mon Apr 26, 2021 12:47 am

Apparently, there was a patent about this auxiliary lens system too:
Zeiss 445265 patent.pdf
(477.92 KiB) Downloaded 154 times
Matador

Matador
Posts: 48
Joined: Sun Apr 25, 2021 4:55 pm

Re: Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#3 Post by Matador » Mon Apr 26, 2021 1:03 am

Here is what the patent document talks about... I need this weird auxiliary lense highlighted in yellow (Zeiss part 44 52 65): It is a "negative (convex-concave) meniscus lens"
The lens.JPG
The lens.JPG (79.1 KiB) Viewed 5538 times
text.JPG
text.JPG (151.49 KiB) Viewed 5538 times
Last edited by Matador on Sun May 09, 2021 2:14 pm, edited 2 times in total.

Matador
Posts: 48
Joined: Sun Apr 25, 2021 4:55 pm

Re: Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#4 Post by Matador » Mon Apr 26, 2021 1:17 am

This auxiliary lens 1.25 (44 52 65) should fit in this aplanatic-achromatic zeiss phase condenser (44 52 41)(4 positions). I have the exact same one but these pics are from eBay.
s-l1600 (1).jpg
s-l1600 (1).jpg (97.03 KiB) Viewed 5393 times
HD1.JPG
HD1.JPG (117.92 KiB) Viewed 5393 times
D12.JPG
D12.JPG (116.77 KiB) Viewed 5393 times
H.JPG
H.JPG (99.16 KiB) Viewed 5393 times
D.JPG
D.JPG (93.73 KiB) Viewed 5393 times
Looking to buy this Ziess 44 52 65 auxiliary lens to fit this zeiss phase/DIC condenser.

Matador
Last edited by Matador on Mon May 03, 2021 2:31 pm, edited 6 times in total.

Hobbyst46
Posts: 4277
Joined: Mon Aug 21, 2017 9:02 pm

Re: Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#5 Post by Hobbyst46 » Mon Apr 26, 2021 1:02 pm

Zeiss would probably charge a premium for that lens...

1. have you tried to use the objective without any condenser ? how bad could that be ?
2. Here is a way to spend $15 (US price) on a negative meniscus lens of diameter ~24mm, not that I could tell if the focal length is good ( :lol: )

https://www.ebay.com/itm/114227340494?h ... xyJX1TAPch

At least, it is made of glass, rather than zinc selenide or some other IR-relevant material

BTW - are the colorful stains on the periphery of the aperture leaves dried oil, or deterioration of black coating ?

Sorry - I just saw that similar to my no 1 suggestion above has already been posted by PeteM and Apochronaut.

Matador
Posts: 48
Joined: Sun Apr 25, 2021 4:55 pm

Re: Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#6 Post by Matador » Mon Apr 26, 2021 8:41 pm

Thanks for the reply,

1. I tried using the 1.25x objective with no condenser at all and it works perfect... I get 100% field of view illumination... Just a bit annoying, as I jump from one objective mag to the other multiple times every minutes.
2. Interesting lens... I guess I need to figure out the focal distance.
Not even sure that zeiss still could find this lens if they do have a new old stock inventory.
Last edited by Matador on Sun May 09, 2021 2:19 pm, edited 2 times in total.

Matador
Posts: 48
Joined: Sun Apr 25, 2021 4:55 pm

Re: Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#7 Post by Matador » Thu Apr 29, 2021 12:35 am

I believe the auxiliary lense (44 52 65) fits in position "1" or "2" (which are the positions that can also accomodate phase ring diaphragms), but not in position "H/DIC" or "DIC" (which are meant to accomodate DIC prisms and also have integrated iris diaphragms). So the auxiliary lens (44 52 65) would fit in these "1" or "2" positions:
Capture.JPG
Capture.JPG (124.96 KiB) Viewed 5394 times
Pos1.JPG
Pos1.JPG (83.31 KiB) Viewed 5394 times
Pos2.JPG
Pos2.JPG (79.94 KiB) Viewed 5394 times
I'll try to take measurments this week end of these positions to try and find what shoud be the size of that auxiliary lens (44 52 65)

Matador

PeteM
Posts: 2982
Joined: Tue Dec 06, 2016 6:22 am
Location: N. California

Re: Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#8 Post by PeteM » Thu Apr 29, 2021 6:59 am


Matador
Posts: 48
Joined: Sun Apr 25, 2021 4:55 pm

Re: Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#9 Post by Matador » Fri Apr 30, 2021 1:07 am

PeteM wrote:
Thu Apr 29, 2021 6:59 am
Perhaps (???):
https://www.ebay.com/itm/194074524813?h ... 000%7C7000
[Picture from eBay seller #1]
eBay1.JPG
eBay1.JPG (37.98 KiB) Viewed 4905 times
Yes I saw this one, but I'm not sure it's the right kind. The seller does not advertise the lens diameter so I'm not sure it would fit in the condenser turret.

I also saw another seller selling this ( https://www.ebay.com/itm/283936887880 ) , but it seems to be for the Zeiss Photomicroscope, the Ziess Universal microscope and the Zeiss standard miscroscope (all older scopes with fixed tube lenghts, not infinity corrected systems).
[Pictures from eBay seller #2]
eBay2a.JPG
eBay2a.JPG (23.72 KiB) Viewed 4905 times
eBay2b.JPG
eBay2b.JPG (24.96 KiB) Viewed 4905 times
eBay2c.JPG
eBay2c.JPG (24.77 KiB) Viewed 4905 times
eBay2d.JPG
eBay2d.JPG (47.43 KiB) Viewed 4905 times
Matador
Last edited by Matador on Sun May 09, 2021 2:33 pm, edited 3 times in total.

Matador
Posts: 48
Joined: Sun Apr 25, 2021 4:55 pm

Re: Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#10 Post by Matador » Fri Apr 30, 2021 1:15 am

PeteM wrote:
Thu Apr 29, 2021 6:59 am
Perhaps (???):
https://www.ebay.com/itm/194074524813?h ... 000%7C7000
This is NOT the right lens (NOT compatible with the Axioskop infinity corrected system). I found out that this specific lens on eBay is 1.25 inch (32 mm) diameter wide (too wide for the 24mm slot in the phase condenser turret):
https://www.ebay.com/itm/154398048566?_ ... 0667.m2042

[Pictures from eBay seller #3]:
eBay3a.JPG
eBay3a.JPG (24.25 KiB) Viewed 4905 times
eBay3b.JPG
eBay3b.JPG (42.37 KiB) Viewed 4905 times
eBay3c.JPG
eBay3c.JPG (27.53 KiB) Viewed 4905 times
eBay3d.JPG
eBay3d.JPG (27.5 KiB) Viewed 4905 times
Matador
Last edited by Matador on Sun May 09, 2021 2:36 pm, edited 7 times in total.

User avatar
75RR
Posts: 8207
Joined: Sun Oct 12, 2014 2:34 am
Location: Estepona, Spain

Re: Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#11 Post by 75RR » Fri Apr 30, 2021 7:47 am

Matador wrote:
Fri Apr 30, 2021 1:15 am
It's not the right lense. I found out that that one on eBay is 1.25 inch diameter wide (too wide for the 24mm slot in the phase condenser turret):
https://www.ebay.com/itm/154398048566?_ ... 0667.m2042
That is a Zeiss finite system auxiliary lens, there is a N˚I and a N˚II, they are designed to be placed under the condenser in a filter holder and are therefore 32mm.
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)

Matador
Posts: 48
Joined: Sun Apr 25, 2021 4:55 pm

Re: Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#12 Post by Matador » Fri Apr 30, 2021 10:33 pm

75RR wrote:
Fri Apr 30, 2021 7:47 am
Matador wrote:
Fri Apr 30, 2021 1:15 am
It's not the right lense. I found out that that one on eBay is 1.25 inch diameter wide (too wide for the 24mm slot in the phase condenser turret):
https://www.ebay.com/itm/154398048566?_ ... 0667.m2042
That is a Zeiss finite system auxiliary lens, there is a N˚I and a N˚II, they are designed to be placed under the condenser in a filter holder and are therefore 32mm.
Indeed, I'll have to keep looking around.

Matador

User avatar
75RR
Posts: 8207
Joined: Sun Oct 12, 2014 2:34 am
Location: Estepona, Spain

Re: Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#13 Post by 75RR » Sat May 01, 2021 7:19 am

Matador wrote:
Fri Apr 30, 2021 1:15 am
(too wide for the 24mm slot in the phase condenser turret):
Are you sure it fits 'in' the turret rather than as most auxiliary lens do, in a filter holder slung under the condenser?
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)

MichaelG.
Posts: 3976
Joined: Mon Apr 10, 2017 8:24 am
Location: North Wales

Re: Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#14 Post by MichaelG. » Sat May 01, 2021 8:02 am

75RR wrote:
Sat May 01, 2021 7:19 am
Matador wrote:
Fri Apr 30, 2021 1:15 am
(too wide for the 24mm slot in the phase condenser turret):
Are you sure it fits 'in' the turret rather than as most auxiliary lens do, in a filter holder slung under the condenser?
Both the highlighted text, and the patent drawing, seem pretty explicit

MichaelG.
Too many 'projects'

User avatar
75RR
Posts: 8207
Joined: Sun Oct 12, 2014 2:34 am
Location: Estepona, Spain

Re: Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#15 Post by 75RR » Sat May 01, 2021 8:19 am

MichaelG. wrote:
Sat May 01, 2021 8:02 am
75RR wrote:
Sat May 01, 2021 7:19 am
Matador wrote:
Fri Apr 30, 2021 1:15 am
(too wide for the 24mm slot in the phase condenser turret):
Are you sure it fits 'in' the turret rather than as most auxiliary lens do, in a filter holder slung under the condenser?
Both the highlighted text, and the patent drawing, seem pretty explicit

MichaelG.
Missed that! Seems a shame to use up a slot though.
.
Attachments
x1.png
x1.png (67.93 KiB) Viewed 5193 times
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)

Hobbyst46
Posts: 4277
Joined: Mon Aug 21, 2017 9:02 pm

Re: Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#16 Post by Hobbyst46 » Sat May 01, 2021 8:53 am

75RR wrote:
Sat May 01, 2021 8:19 am
...Seems a shame to use up a slot though.
Not to mention only 4 slots in the condenser of such a modern microscope...

Matador
Posts: 48
Joined: Sun Apr 25, 2021 4:55 pm

Re: Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#17 Post by Matador » Sat May 01, 2021 12:00 pm

Hobbyst46 wrote:
Sat May 01, 2021 8:53 am
75RR wrote:
Sat May 01, 2021 8:19 am
...Seems a shame to use up a slot though.
Not to mention only 4 slots in the condenser of such a modern microscope...
That's a good point. Personally, I don't use darkfield illumination, phase contrast or DIC in my work (I do anatomic pathology and cytology) so it would not matter much to me. But the microscope is good, relatively rare to find fully equipped, and I could experiment a bit more in the future with these additionnal illumination techniques.

For the Axioskop, Zeiss actually used to offered two phase contrast condenser possibilities:
Option 1 : The Condenser 0,9 Ph HD with swing-in front lens (44 52 36), which had 4 positions in it's rotatable turret, including 3 positions ("1", "2" and "3") for phase contrast ring diaphragms and one position ("H") for Brightfield.
Option 2 : which is the condenser I have, is the aplanatic-achromatic 0,9 Ph DIC condenser (44 52 41) with swing in front lens. This 4 positions condenser has 2 positions ("1" and "2") for phase contrast ring diaphragms, one position ("DIC") for DIC and one position (called "H/DIC") for either Brightfield or DIC.

The "H" position in condenser 44 52 36 or both "DIC" and "H/DIC" positions in condenser 44 52 41 have their own dedicated adjustable iris diaphragms. On the other hand, positions "1", "2" and "3" of condenser 44 52 36, or positions "1" and "2") of condenser 45 52 41 do not have iris diaphragms, but they have centerable apertures (with phase centering screws) to properly align the phase contrast ring diaphragms that they can accomodate. In addition to that, it is possible to put a either a darkfield diaphragm (44 52 99) or a 1.25 Auxiliary lens (44 52 65) in condenser turret ports "1", "2" (or "3" ) instead of the phase rings. Meaning the auxiliary lens (or darkfield diphargm) can also be properly aligned with adjusting the phase centering screws (in addition to the whole condenser which can be aligned for Kohler illumination using the knurled Kohler alignment screws). As for DIC, Zeiss used to offer two DIC prisms for these condensers :(44 52 73) and (44 52 74).

See details of condenser possibilities and condenser accessories for the Axioskop in this manual: https://www.google.com/url?sa=t&source= ... JUF6z3C2Ch

Matador
Last edited by Matador on Sun May 09, 2021 3:26 pm, edited 4 times in total.

Matador
Posts: 48
Joined: Sun Apr 25, 2021 4:55 pm

Re: Need Ziess 1.25x Auxiliary lens (part number 44 52 65)

#18 Post by Matador » Sat May 08, 2021 4:34 am

To my understanding, this Auxiliary lens 1.25x (44 52 65) works like this (you rotate the condenser turret to get the auxiliary lens 1.25x in the light path and lower the swing-in/swing-out "front lens" when you need to use the Plan-NEOFLUAR 1.25x objective):
Condenser light path.jpg
Condenser light path.jpg (57.42 KiB) Viewed 4998 times
I'm still looking/searching to find this unobtainable Zeiss "Auxiliary lens 1.25x" (44 52 65). I even posted this on a Zeiss facebook group that was recommend to my by MichealG.

Matador

Post Reply