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Zeiss Jena Orthos

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#1 chuckscap

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Posted 06 March 2017 - 10:19 PM

Hi anyone have these eyepieces?  Opinions?



#2 RAKing

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Posted 06 March 2017 - 10:29 PM

Chuck,

 

I used to have a fairly complete set of CZJ and I thought they were very nice.  Not quite as good as ZAO, but close enough. I finally let everything go due to cataracts (since corrected), but I will always have a warm place in my heart for these eyepieces. They were my first "quality" orthos.

 

Here is the Family photo. I had doubles of the middle group (16, 12.5, and 10mm) to use in my binos. I searched for a second 8mm, but nobody would sell me another one. Heck, the first one was expensive enough! lol.gif

 

Cheers,

 

Ron

  

CZJFamily_122509a.JPG

 



#3 buddy ny

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Posted 07 March 2017 - 04:19 AM

Chuck,

 

I used to have a fairly complete set of CZJ and I thought they were very nice.  Not quite as good as ZAO, but close enough. I finally let everything go due to cataracts (since corrected), but I will always have a warm place in my heart for these eyepieces. They were my first "quality" orthos.

 

 

 

Cheers,

 

Ron

  

 

 

I  agree..but no cataracts yet

ive owned Pentax SMC orthos &  Zeiss Abbe orthos,,,,complete sets of both

and yet the CZJ orthos  was the lone Ziess I kept

except for the 16mm Zeiss microscope EP

CZJ orthos are  almost there with the Pentax & The Zeiss Abbes

the 10mm CZJ was a workhorse or me


Edited by buddy ny, 07 March 2017 - 04:21 AM.


#4 SandyHouTex

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Posted 07 March 2017 - 10:04 AM

I agree.  The 10 mm Zeiss Jena is unique in the ortho world.  I use mine a lot also.



#5 Tank

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Posted 07 March 2017 - 10:25 AM

I miss my 10 CZJ



#6 Astrojensen

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Posted 07 March 2017 - 11:06 AM

I miss my 10 CZJ

I have three of them... And I don't want to sell any of them. I have an older one with brass barrel that is phenomenally sharp and I have two new ones, completely identical, that I very recently discovered works extremely well in my binoviewer. 

 

Apart from those, I have two 16mm, one brass, one aluminum, and a 6mm with brass barrel and a prewar 9mm. 

 

 

Clear skies!

Thomas, Denmark



#7 Sasa

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Posted 07 March 2017 - 01:25 PM

Chuck,

I used to have a fairly complete set of CZJ and I thought they were very nice. Not quite as good as ZAO, but close enough. I finally let everything go due to cataracts (since corrected), but I will always have a warm place in my heart for these eyepieces. They were my first "quality" orthos.

Cheers,

Ron

CZJFamily_122509a.JPG

+1. My experience is similar to Ron. These are fine eyepieces, slightly below the ZAOs and TMB monocentrics, still very good. 25mm and 12.5mm have their place in my working box. I'm not using too often O-4 nowadays, as my shortest telescope is f/13.3. It is in the box in case I would need 4mm eyepiece

th_eyepiece_case2.jpg

Edited by Sasa, 07 March 2017 - 01:26 PM.


#8 vahe

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Posted 07 March 2017 - 02:12 PM

Missing 12.5, 8, 40mm

If you are unable to find 12.5 and 8 but are brave enough to accept an alternate my suggestion is to look for 12 & 9mm Pentax SMC Ortho eyepieces, not the same focal lengths but close enough, these are also hard to find but not as difficult as the two CZJ eyepieces mentioned, in quality department Pentax Ortho’s are at least as good if not better than pre ZAO-I series.

 

Vahe



#9 junomike

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Posted 07 March 2017 - 03:39 PM

My CZJ's were only bumped out of my eyepiee case by some TMB SMC's.  Even then the difference wasn't huge but I preferred he cleaner tone of the TMB's.

 

Mike



#10 Ava

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Posted 07 March 2017 - 07:11 PM

 

Chuck,

I used to have a fairly complete set of CZJ and I thought they were very nice. Not quite as good as ZAO, but close enough. I finally let everything go due to cataracts (since corrected), but I will always have a warm place in my heart for these eyepieces. They were my first "quality" orthos.

Cheers,

Ron

CZJFamily_122509a.JPG

+1. My experience is similar to Ron. These are fine eyepieces, slightly below the ZAOs and TMB monocentrics, still very good. 25mm and 12.5mm have their place in my working box. I'm not using too often O-4 nowadays, as my shortest telescope is f/13.3. It is in the box in case I would need 4mm eyepiece

th_eyepiece_case2.jpg

 

Nice collection! What is the 8mm eyepiece in the back left and what is its performance? Not many options in the 8mm ortho department, and the CZJ 8mm is both extremely expensive and rare so I'm looking for good alternatives.



#11 Sasa

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Posted 08 March 2017 - 07:28 AM

Yep, not many options for 8mm orthos... My 8mm is Erfle eyepiece, in fact the first one I bough as a kid around 1990. It was made by small optical workshop ATC here in our country. To my surprise, when I was trying to get the second one for binoviewing, the company still made those even after 25 years and I have two such eyepieces now. The are identical, except the coatings which are visibly better for new one.

 

Unfortunately, Jaromir Holubec, the owner of ATC company, does not make orthos. But he makes very nice Kellner (I have 40mm from him, with M44x1 thread for Zeiss turret - it is on par with Zeiss O-40, at least in f/13 and longer, and second handed K20), and excellent Plossls (I have 2" 40mm plossl and 32mm Plossl in M44x1 format):

 

sm_czj_atc_eyepieces.jpg

 

th_ATC40PEX_00.jpg



#12 Jim Curry

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Posted 08 March 2017 - 08:24 PM

I have 4-40 except the 8.  My Pentax 8XP is a very nice fill in. It's a great filler in the SMC slot between the 7&9, also.

 

Jim



#13 Deep13

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Posted 09 March 2017 - 02:58 AM

Have a pair of 16s. Only used them once, the winter weather here is pretty bad. The seeing was poor, so I was not able to use them to their limits. Hopefully, I can take them out again soon.

#14 Disciplus55

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Posted 09 March 2017 - 04:20 PM

What about the 25-O slim version ? Who can tell me more about it, in all aspects ?



#15 Jim Curry

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Posted 09 March 2017 - 07:29 PM

I thought the 25's were all svelte.

 

Jim



#16 PJ Anway

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Posted 09 March 2017 - 07:57 PM

I've owned quite a few CZJ orthos over the years, but the 10mm has always been my favorite. Mine is an earlier version and shows excellent sharpness and contrast.

 

IMG_0014.JPG



#17 Disciplus55

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Posted 10 March 2017 - 12:33 PM

Tonight I will test and compare the CZJ 25-O slim and the ZAO 25 on my Tak. Let's see how it goes.



#18 Astrojensen

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Posted 10 March 2017 - 12:46 PM

Tonight I will test and compare the CZJ 25-O slim and the ZAO 25 on my Tak. Let's see how it goes.

I predict that they will be more alike than different, but that the O-25 will have a slightly yellowish image and the ZAO 25 will be more neutral. The transmission in the ZAO will be slightly better. 

 

 

Clear skies!
Thomas, Denmark



#19 Ava

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Posted 11 March 2017 - 03:39 AM

I've owned quite a few CZJ orthos over the years, but the 10mm has always been my favorite. Mine is an earlier version and shows excellent sharpness and contrast.

 

attachicon.gifIMG_0014.JPG

 

I have pairs of the 16mm and 10mm CZJs, and singles of 25mm and 6mm. Like you I always thought the 10mm to be the best of the bunch, until I got the 6mm which is just as good. The 6mm CZJ and 5mm XO are my main planetary eyepieces in the 120mm apo.

 

The 25mm I have never really liked, it has weird exit pupil behavior, and is in my case surpassed by the Zeiss microscope eyepieces I have (Pl 10x/25 Br). I'm considering trying to find a 4mm CZJ but for the few occasions I would be able to use I'm not sure it's worth the asking price.



#20 Disciplus55

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Posted 11 March 2017 - 04:15 AM

 

Tonight I will test and compare the CZJ 25-O slim and the ZAO 25 on my Tak. Let's see how it goes.

I predict that they will be more alike than different, but that the O-25 will have a slightly yellowish image and the ZAO 25 will be more neutral. The transmission in the ZAO will be slightly better. 

 

 

Clear skies!
Thomas, Denmark

 

Exactly !!!! Plus a bit more scatter for the 25-O than on the ZAO 25... but both showed a high level of details and contrast, with a slightly warmer/yellowish tone for the CZJ. After I did a Comparison on the CZJ 4-O and the ZAO II 4, and the yellowish image of the CZJ was even more pronounced compare to the ZAO II. More brighteness (neutral tone) in the ZAO II, but equally sharp on the details of the Moon.



#21 chuckscap

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Posted 22 March 2017 - 09:17 PM

Thank you all.  I have the 25mm, 16mm and 10mm.   I just bought a TEC 7 Mak/Cass so I plan to use them a lot.



#22 Napersky

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Posted 26 March 2017 - 06:27 AM

So I now need the 8mm and the 40mm

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#23 Terra Nova

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Posted 28 March 2017 - 06:25 PM

I have the 25, 16, 10, and 6 mm orthos and the 25mm and 16mm Huygenian as well; all the heavy brass older issue. They are amongst my favorites and I think they are superb eyepieces. Their performance is unsurpassed in  my Telementor (T-1).

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#24 Terra Nova

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Posted 28 March 2017 - 06:26 PM

Left to right: 25mm O, 25mm H, 16mm O, 16mm H, 10mm O, and 6mm O

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Edited by terraclarke, 28 March 2017 - 06:28 PM.


#25 SandyHouTex

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Posted 29 March 2017 - 09:14 AM

Left to right: 25mm O, 25mm H, 16mm O, 16mm H, 10mm O, and 6mm O

That's a very nice collection Terra.


Edited by SandyHouTex, 29 March 2017 - 09:15 AM.



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