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Equipment Discussions >> Binoviewers

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Sarkikos
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Reged: 12/18/07

Loc: Suburban Maryland, USA
Re: Best 25mm eyepieces ever! new [Re: Sarkikos]
      #5264058 - 06/09/12 10:22 PM

How would the Zeiss compare to these?

PAIR WF 10X PLAN EYEPIECES

Mike


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Astrojensen
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Reged: 10/05/08

Loc: Bornholm, Denmark
Re: Best 25mm eyepieces ever! new [Re: Sarkikos]
      #5264268 - 06/10/12 02:24 AM

Quote:

How would the Zeiss compare to these?

PAIR WF 10X PLAN EYEPIECES




Well, the basics numbers are the same, so they would have the same field of view, etc. They're also long eye relief, so they should be comfortable. My guess is that they should be pretty close, but as we all know, an eyepiece is the sum of its parts, so while they should perform pretty much the same, it's not guaranteed that they will do so. Based on the numbers alone, my TS Kellners should be the equal of my Zeiss'es, but in practice, that's *not* the case at all, of course (I am not saying these AmScope eyepieces are bad).

I do think they're very fine eyepieces, though perhaps not quite the equal of those Zeiss'es. I have seen enough eyepieces to know when I see something special and they are very special indeed, not just because I happen to be the owner.


Clear skies!
Thomas, Denmark


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Sarkikos
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Reged: 12/18/07

Loc: Suburban Maryland, USA
Re: Best 25mm eyepieces ever! new [Re: Astrojensen]
      #5264958 - 06/10/12 04:00 PM

It seems that some eyepieces are easier to find for reasonable prices in Europe than in the USA, and others are easier to find in the USA. Europe is the place to go for Zeiss, the USA for Brandons. But lately even Brandons appear to be scarce on the used market on this side of the Atlantic - or at least the Brandons I'm looking for.

Mike


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saemark30
Pooh-Bah


Reged: 02/21/12

Re: Best 25mm eyepieces ever! new [Re: johnnyha]
      #5268223 - 06/12/12 02:54 PM

Is the 44 42 31 the E-PL or just PL?
Or did they use the same numbers for both types?


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Ava
sage


Reged: 11/30/11

Loc: Sweden
Re: Best 25mm eyepieces ever! new [Re: saemark30]
      #5268943 - 06/13/12 01:33 AM

Anyone know the details of the Zeiss Pl 10x/25 Br. Foc. with number 444034? It seems to be the same 4 element 3 group design you have been talking about but with a 25mm field stop? Also, Markus at APM sell these new but with Zeiss number 444034-9000-000, anyone know the significance of these last numbers?

Thanks,


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cbowman
newbie


Reged: 05/13/10

Re: Best 25mm eyepieces ever! new [Re: Scott99]
      #5289268 - 06/25/12 10:17 PM Attachment (110 downloads)

Hi: I was hoping someone on this thread can help me figure out what eye pieces I have. First on one side,they both have P1 10 x/18 with the eye glass icon, leading me to believe that they are the 25mm that have been discussed. However, the two are different; the other side on one has 44 41 32 01 and on the other 44 41 31 01. They are slightly different in that the 44 41 32 has what appears to be a built in focuser and index markings while the 44 41 32 Does not. I will show a couple of images to show what I am talking about. Any help would be appreciated. Curtis

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cbowman
newbie


Reged: 05/13/10

Re: Best 25mm eyepieces ever! new [Re: cbowman]
      #5289272 - 06/25/12 10:19 PM Attachment (116 downloads)

Here are two other shots.

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cbowman
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Reged: 05/13/10

Re: Best 25mm eyepieces ever! new [Re: cbowman]
      #5289273 - 06/25/12 10:20 PM Attachment (90 downloads)

and the last pic

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langejcarl
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Reged: 01/05/05

Loc: Michigan USA
Re: Best 25mm eyepieces ever! new [Re: cbowman]
      #5294495 - 06/29/12 08:47 AM

My understanding is that the 10 means it is 25mm, the 18 is the field stop and the glasses symbol means long eye relief. Hope that helps some.

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suburbanskies
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Reged: 12/18/04

Loc: New Jersey, USA
Re: Best 25mm eyepieces ever! new [Re: cbowman]
      #5295474 - 06/29/12 08:49 PM

Curtis,

I have a pair of the 44 41 31, identical to yours. Once I took it apart for cleaning and yes, it is 3 elements in 2 groups. One element looked obviously non-spherical so I presume that is the aspheric element. I bought this used and the seller sold it as the "25mm Zeiss aspheric triplet" and I believe this is correct. Wonderful performance to my eyes!

Mark


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Heavens Above
sage


Reged: 01/25/09

Loc: Bristol, UK
Re: Best 25mm eyepieces ever! new [Re: suburbanskies]
      #5297327 - 07/01/12 04:45 AM

I have a pair of Zeiss E-PL 10x/20 No 44 42 32 and these are amazing eyepieces. E-PL stands for extra planar. I believe this refers to the eyepiece having an extra flat field. Their is post somewhere in the eyepiece forum that explains the different versions. The E-PL is rarer than the PL and more expensive. They are my favourite eyepieces.

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cbowman
newbie


Reged: 05/13/10

Re: Best 25mm eyepieces ever! new [Re: Heavens Above]
      #5298555 - 07/01/12 09:24 PM

Thank you all very much.

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RodgerHouTex
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Reged: 06/02/09

Loc: Houston, Texas, USA
Re: Best 25mm eyepieces ever! new [Re: Heavens Above]
      #5312799 - 07/11/12 01:12 PM

How long ago did you purchase your Zeiss microscope eyepiece 44 42 32? Was it made in China?

I bought one about a year and a half ago directly from Zeiss and it was made in China. Mine is also unusable as an astro eyepiece. Bright field (no coatings?), field curvature, etc.


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Heavens Above
sage


Reged: 01/25/09

Loc: Bristol, UK
Re: Best 25mm eyepieces ever! new [Re: RodgerHouTex]
      #5313057 - 07/11/12 05:32 PM

Hi Roger

I bought them about 18 months ago of Ebay, second hand, so I don't know how old they are. The say Carl Zeiss West Germany on the rubber eye guards. There is a photo of them in my recent CN review of my Tak Mewlon 210.

http://www.cloudynights.com/item.php?item_id=2791


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RodgerHouTex
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Reged: 06/02/09

Loc: Houston, Texas, USA
Re: Best 25mm eyepieces ever! new [Re: Heavens Above]
      #5313548 - 07/11/12 11:03 PM

You are lucky. Those are obviously the ones that were still made in Germany.

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rfr66
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Reged: 12/07/11

Loc: Long Island, NY
Re: Best 25mm eyepieces ever! new [Re: RodgerHouTex]
      #5363893 - 08/11/12 08:39 PM

I have a pair of the E-PL 10x/20 that are made in China and can say that they perform amazingly well just as everyone described. Maybe you had a defective one. They are my favorite eyepieces and the only ones I am using for binoviewing. I tried a pair of the ridiculously expensive, $1400 each, E-PL 10x/25s but returned them. The extra wide angle on those was achieved with an additional screw on glass element that made the image much softer and fuzzier as if it stretched everything wider.

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chrisg
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Reged: 02/15/09

Re: Best 25mm eyepieces ever! new [Re: rfr66]
      #5524245 - 11/17/12 11:54 AM

Anybody know what is the difference between KPL, EPL, and plain PL? How does this effect their astronomical use? Does "W" mean "wide"? And for a 10x eyepiece, how far can you push these with a barlow before the image degrades? Do these eyepieces take barlowing particularly well??

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Astrojensen
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Reged: 10/05/08

Loc: Bornholm, Denmark
Re: Best 25mm eyepieces ever! new [Re: chrisg]
      #5524528 - 11/17/12 02:58 PM

Hi Chris

"PL" means "planokular", which means flat field eyepiece. "KPL" = Compensating flat field eyepiece (an eyepiece that compensates for the last spherochromatism in apochromatic microscope objectives). "EPL" = Episcopic flat field eyepiece (I think! Not sure). The PL or flat field eyepieces can safely be used for astronomical telescopes. W does indeed mean wide. Wide is usually around 50° AFOV in the microscope world...

My own 10x (25mm focal length) microscope eyepieces can be barlowed in the extreme. I usually stack Baader GPCs to reach short effective focal lengths with them. 3x - 4x barlow effect is no problem at all. I believe Erik Bakker, who has identical eyepieces, also barlows his into very high magnification. Microscope eyepieces are usually designed with very long f/ratios in mind (with a high magnification objective, f/ratios can go into the hundreds!), which explains why they work so extremely well with barlows.


Clear skies!
Thomas, Denmark


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chrisg
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Reged: 02/15/09

Re: Best 25mm eyepieces ever! new [Re: Astrojensen]
      #5524546 - 11/17/12 03:06 PM

Thanks Thomas -

Just to be totally clear - you're not recommending the KPL or EPL eyepieces for astronomical use?
Thanks for the info!

Best,

Chris


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Astrojensen
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Loc: Bornholm, Denmark
Re: Best 25mm eyepieces ever! new [Re: chrisg]
      #5524668 - 11/17/12 04:44 PM

Quote:

Just to be totally clear - you're not recommending the KPL or EPL eyepieces for astronomical use?




I can't say for sure, that they'll work without issues, as I don't have any experience with them at all. I've only used normal PL eyepieces and these have been spectacular.


Clear skies!
Thomas, Denmark


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