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Equipment Discussions >> Eyepieces

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mac57
super member


Reged: 02/19/13

Loc: DeLand of Oz, Florida
High-power eyepiece choice for my f/5.
      #5791075 - 04/10/13 07:01 PM

I want a higher-power EP, and am wondering if the ES 82 in a high power is worth the cost difference versus an AstroTech Paradigm? Are the 82's really that good for the money? I just don't want to buy the same size EP twice. All opinions welcome, and thanks.

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Achernar
Postmaster
*****

Reged: 02/25/06

Loc: Mobile, Alabama, USA
Re: High-power eyepiece choice for my f/5. new [Re: mac57]
      #5791104 - 04/10/13 07:26 PM

I would say yes, they are that good. When the seeing is good, I use my 6.7 and 4.7mm ES 82 degree eyepieces on Jupiter and Saturn often, even though on the 15-inch they yield 300 and 425X. They come close to Naglers in performance, for a lot less money. The huge apparent field of view makes tracking objects through my Dobs at high power a lot easier, and that also makes looking for small and dim DSO's easier too. The only drawback they have is the eye relief is too short to see the whole FOV with eyeglasses on. Even through I wear glasses, I find the views to be more than pleasing without them, even through the 24mm I have.

Taras


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mac57
super member


Reged: 02/19/13

Loc: DeLand of Oz, Florida
Re: High-power eyepiece choice for my f/5. new [Re: Achernar]
      #5791153 - 04/10/13 07:54 PM

Thanks, and either EP has better eye relief than what I have now.

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buddyjesus
Carpal Tunnel
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Reged: 07/07/10

Loc: Davison, Michigan
Re: High-power eyepiece choice for my f/5. new [Re: mac57]
      #5791238 - 04/10/13 08:24 PM

paradigm only goes down to 8mm and I read that the 8mm is the worst of the bunch IRT aberrations. I have not used this eyepiece but love my 12mm paradigm.

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planet earth
Carpal Tunnel
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Reged: 09/07/10

Loc: Ontario Canada
Re: High-power eyepiece choice for my f/5. new [Re: buddyjesus]
      #5791761 - 04/11/13 04:11 AM

Quote:

paradigm only goes down to 8mm




They make a 5mm Paradigm, I believe your thinking about the Astro Tech flat field that goes down to 8mm.
Sam


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Sarkikos
Postmaster
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Reged: 12/18/07

Loc: Scotophobe Maryland, USA
Re: High-power eyepiece choice for my f/5. new [Re: buddyjesus]
      #5791826 - 04/11/13 07:09 AM

buddyjesus,

Quote:

paradigm only goes down to 8mm and I read that the 8mm is the worst of the bunch IRT aberrations. I have not used this eyepiece but love my 12mm paradigm.




I have bino pairs of the 8 and 12 Paradigm. They are great for bright planets and the Moon. Carlos Hernandez - an excellent observer who posts here on CN - gave them good marks.

Paradigm Dual ED

Mike


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tezster
scholastic sledgehammer
*****

Reged: 07/14/09

Loc: Missisauga, Canada
Re: High-power eyepiece choice for my f/5. new [Re: Sarkikos]
      #5791859 - 04/11/13 07:46 AM

With a ~750mm focal length, I would be looking for an EP in the 3.5mm to 5mm range to give you the high power you're looking for. Anything longer than that, then I would consider getting a barlow as well.

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BDS316
Carpal Tunnel


Reged: 09/16/09

Loc: Sol 3
Re: High-power eyepiece choice for my f/5. new [Re: buddyjesus]
      #5792020 - 04/11/13 09:54 AM

Quote:

I read that the 8mm is the worst of the bunch IRT aberrations. I have not used this eyepiece but love my 12mm paradigm.




I'm surprised to hear this because of the CN review of the 8mm Paradigm vs the 8.5mm Pentax XF, which I consider a darn good eyepiece.

This either means that the 8mm is the dog of the line or that the others are simply amazing?

Where did you read this?


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Sarkikos
Postmaster
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Reged: 12/18/07

Loc: Scotophobe Maryland, USA
Re: High-power eyepiece choice for my f/5. new [Re: BDS316]
      #5792024 - 04/11/13 09:54 AM

The Paradigm 8mm is not the dog of the line, by any means.

Mike


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BDS316
Carpal Tunnel


Reged: 09/16/09

Loc: Sol 3
Re: High-power eyepiece choice for my f/5. new [Re: Sarkikos]
      #5792045 - 04/11/13 10:09 AM

Quote:

The Paradigm 8mm is not the dog of the line, by any means.

Mike




That's what I would have thought before reading the above post by buddyJ. I would like to know what he read and is basing his opinion.

I was considering the purchase of the 8mm Paradigm at NEAF, in order to compare it to my Pentax 8.5mm XF, with the loser being sold in CN Classifieds.

Edited by BDS316 (04/11/13 10:23 AM)


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buddyjesus
Carpal Tunnel
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Reged: 07/07/10

Loc: Davison, Michigan
Re: High-power eyepiece choice for my f/5. new [Re: BDS316]
      #5792505 - 04/11/13 02:25 PM

good to hear the response on the 8mm. I will look into them further then!

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Widespread
professor emeritus


Reged: 05/11/11

Loc: Bowling Green, Kentucky
Re: High-power eyepiece choice for my f/5. new [Re: buddyjesus]
      #5792562 - 04/11/13 02:56 PM

Mac,

I love my ES eyepieces, but I think I read that they are corrected only to f/6. This is one of the reasons I chose an f/7 apo.

TVs are supposedly corrected to f/4. I personally don't know any other brand that claims to be corrected to f/5 or lower.

That said, the ES 82s should perform much better than your Plossls in an f/5, and of course the wide view is nice in a Dob. Moreover, they really do represent a lot of value for the price. (I would not be inclined to buy Naglers or Ethos for a Starblast.)

I don't have a Newt, but use my 6.7mm and 8.8mm ES82s a lot in my refractors, and the 8.8mm occasionally sees light in my 8SE.

Best,
David


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Sarkikos
Postmaster
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Reged: 12/18/07

Loc: Scotophobe Maryland, USA
Re: High-power eyepiece choice for my f/5. new [Re: Widespread]
      #5792581 - 04/11/13 03:09 PM

Of course, the ES eyepieces will appear better corrected at f/5 in a Newt when used with a Paracorr. The coma from the primary mirror will be reduced and the field flattened somewhat. My ES 82 30mm is excellent in my 10" f/4.8 Dob with a Paracorr. Without Paracorr not so much, but that is not the eyepiece's fault.

I had a pair of ES 82 14mm for binoviewing, but they exhibited too much field curvature for my eyes. I eventually sold both of them. I don't recall now if I ever tried one with my Paracorr to see if the field was flattened appreciably. But I bought the ES 82 14's for binoviewing planet / Moon, not monoviewing DSO, so I got rid of them.

I have an ES 82 4.7mm that is decent for planets and DSO, even without a Paracorr. I'm only selling it now because it's redundant since I recently bought an XW 5mm.

Mike


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BDS316
Carpal Tunnel


Reged: 09/16/09

Loc: Sol 3
Re: High-power eyepiece choice for my f/5. new [Re: buddyjesus]
      #5792594 - 04/11/13 03:18 PM

Quote:

I read that the 8mm is the worst of the bunch IRT aberrations.




Where did you read this?


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buddyjesus
Carpal Tunnel
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Reged: 07/07/10

Loc: Davison, Michigan
Re: High-power eyepiece choice for my f/5. new [Re: BDS316]
      #5792720 - 04/11/13 04:19 PM

the carlos hernandez review stated there is off axis astigmastism that was less severe than some other eyepieces. also read a few reviews on stargazerslounge.com where they are known as BST explorers.

for the record, I have viewed through the 12mm and feel it is a winner.

Edited by buddyjesus (04/11/13 04:20 PM)


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jrbarnett
Eyepiece Hooligan
*****

Reged: 02/28/06

Loc: Petaluma, CA
Re: High-power eyepiece choice for my f/5. new [Re: mac57]
      #5792994 - 04/11/13 06:13 PM

Do you have a Barlow? There are a few advantages of Barlowing to get higher magnification. First, a Barlow tends to correct for off-axis astigmatism that a simple, affordable longer focal length eyepiece will tend to generate at a relatively fast f/5. Second, quality Barlows can be had inexpensively. Finally, a Barlow can be used with multiple eyepieces, effectively increasing the number of unique focal lengths available to you.

I'd Barlow before I would invest in either an ES 82 or Paradigm if I was at all concerned about budget.

Regards,

Jim


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GeneT
Ely Kid
*****

Reged: 11/07/08

Loc: South Texas
Re: High-power eyepiece choice for my f/5. new [Re: mac57]
      #5793006 - 04/11/13 06:21 PM

For high power--I am pleased with Delos 8, Pentax 7 XW,
Delos 6, Pentax 5 XW, Pentax 5 XO and Radian 4mm.


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Sean Puett
Carpal Tunnel
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Reged: 09/06/10

Loc: always cloudy, washington
Re: High-power eyepiece choice for my f/5. new [Re: GeneT]
      #5794982 - 04/12/13 05:28 PM

ES82s are corrected to f4. The old explore scientific 70* were pretty good to f6 but quickly deteriorated under f6. This statement does not include the newer 68* eyepieces.
ES82s are great in fast scopes. In a newt, you will still see some coma without a paracorr or some similar device.


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hottr6
Carpal Tunnel
*****

Reged: 06/28/09

Loc: 7,500', Magdalena Mtns, NM
Re: High-power eyepiece choice for my f/5. new [Re: jrbarnett]
      #5796290 - 04/13/13 10:04 AM

Hey Jim, you can add that barlows retain the eye relief of the eyepiece being barlowed, which may be easier to use than hi-po eyepieces.

Personally, I avoid barlows. To me, they throw the OTA balance off (by a lot, especially on GEMs), are another place to introduce mechanical off-axis errors, and look like something Rube Goldberg would invent.


Edited by hottr6 (04/13/13 10:05 AM)


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cpsTN
Carpal Tunnel
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Reged: 04/26/07

Loc: Rutherford Co, TN
Re: High-power eyepiece choice for my f/5. new [Re: hottr6]
      #5796360 - 04/13/13 10:37 AM

Hey Shane! Did you know there is a gray newt attached to the end of your EP? What is the other scope - AR5,6?

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