Author Topic: Astro-Tech Flat Field EP's  (Read 229 times)

presalacder

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Astro-Tech Flat Field EP's
« on: December 27, 2017, 07:19:54 PM »
How doe the AT Flat Field EP's compare to the Paradigm Dual ED  eyepieces? No much in the way of reviews on them on the Astronomics sight. Anyone have much experience with the Flat Fields?



safrioheartli

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Re: Astro-Tech Flat Field EP's
« Reply #1 on: December 29, 2017, 04:30:12 AM »
I had what I think is the same eyepiece (I could be mistaken) sold as the Orion Flat Field in 19mm.I liked them.  I had a pair for a Maxbright Binoviewer (worked perfectly because the field stop size is a good match).Anyway, in the C14 and EdgeHD 8" I thought they were pretty good across the field.  Not perfect at the edge in the C14, but pretty sharp at the edge of the field in the EdgeHD 8".Good planetary performance in the C14 (seeing often limits me to about 200X).   I only sold them because I later moved to a different binoviewer, but sometimes I regret the decision.I will say this though.. I have the ES 2068s and they are sharper at the edge of the field of the C14.  Unless you just need a 19mm eyepiece, or if you have flattish field scope, I might recommend that you spend the extra money on the ES2068s.

vidysriret

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Re: Astro-Tech Flat Field EP's
« Reply #2 on: December 31, 2017, 01:24:38 AM »
These same eyepieces are available in about 5 focal lengths under several labels (most are more than the ATs):OrionTelescope ServiceSmart AstronomySkyWatcherBarsta (BST)Levenhuk

Freddy Banks

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Re: Astro-Tech Flat Field EP's
« Reply #3 on: January 03, 2018, 10:11:58 PM »
Thanks for the replies. I am going to check out those ES2068's. I notice that a lot of people really like the ES eyepieces.

Mike Brown

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Re: Astro-Tech Flat Field EP's
« Reply #4 on: January 09, 2018, 11:35:26 PM »
The ES20 68* really performs in my 102XLT refractor, and it's pretty light compared to my other 20mm eyepieces....that's the one advantage of the ES68*, they're fairly light (ok, the 34mm & 40 are a bit heavier then the others, but the 24 and below are fine.  The 16mm throws out some fantastic views, tight eye relief though, but if you don't wear glasses....

therpomercu

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Re: Astro-Tech Flat Field EP's
« Reply #5 on: January 10, 2018, 02:16:25 AM »
I have the 19mm (labelled BST) and it works very well in my refractors. I have not tried it in the Dob, Newt, or Maks.

I also have the ES 68 16 and 24mm and the Meade 5000 SWA in 20 and 24mm.  In the refractors I think the views are quite comparable.

The 19 flat field does have more eye relief than the Meade 20 and a lot more than the ES 16. I find the 19 flat field a very comfortable eyepiece to use, seems rather forgiving of eye placement. I like the twist-up eye guard and it's very light weight (aluminum barrel I suppose). I may buy a few more of the series but the 19 has a 65deg AFOV, whereas the 27 has a 53 deg, and the 16, 12, and 8 are 60 deg. Kinda odd. Plus the eye relief of the 8mm is below 10mm.

I should add the mechanical quality is very nice also, polished and black anodized. Very nice. I believe these are a product of Kunming United.

I'm on the fence as far as the series goes - but I do like  the 19mm. On Luna I thought the sharpness and contrast equalled the ES and Meade eyepieces mentioned above.

As I said above, I may buy a few more.

tmasnilypho

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Re: Astro-Tech Flat Field EP's
« Reply #6 on: January 13, 2018, 01:52:54 PM »
Thanks for all the replies. I am primarily interested in the AT 16mm Flat Field right now. Its sort of a toss up between it and the AT Paradigm 15mm. The Flat Fields (per the tech page) has a 15mm eye relief while the Paradigms have a 13mm eye relief. Both offer a 60deg FOV. Not much difference. I really love my 12mm and 18mm Paradigms but want to upgrade from my Orion Plossl eps.  I did get the set of Orion Expanse eyepieces and like them a lot. Telescope I will be primarily using them with is my Orion 100mm F/6 achro. I could afford maybe up to $100.00 for an ep (beer budget ya know - retired Navy) but couldn't even think of a Tele-Vue or something along those lines. Thanks again for the replies.

twenuvtentu

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Re: Astro-Tech Flat Field EP's
« Reply #7 on: January 13, 2018, 02:03:50 PM »
I have the Orion version of the 19mm. It's a favorite, very nice, sharp, and easy on the eye. Mine is definitely a keeper in my rather eclectic collection.

Paul Melo

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Re: Astro-Tech Flat Field EP's
« Reply #8 on: January 13, 2018, 03:11:22 PM »
For a little over $100 you might consider the AstroTech AF70 wide field eyepiece of 17mm f.l.  I own one and am verypleased with it in my f6.3 refractor. I have owned manyeyepieces in the past, and this ranks right at the top IMO.Its big, and heavy, but its very easy to look through andthe field is wide, flat, sharp, clear out to last 5% or so.A 17mm Nagler has slightly better edge, but the rest iscomparable, from what I can see. I hope you are happy withwhatever choice you make.Wes

Miguel Alvarado

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Re: Astro-Tech Flat Field EP's
« Reply #9 on: January 15, 2018, 03:24:23 PM »
The Flat Field eyepieces have excellent eye relief and are easy to use with the twist up eye cup, but they are not so nice in short focal length scopes, where the edges suffer a lot.

From what I have read the Paradigms are a whole lot better.

Tim Jauregui

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Re: Astro-Tech Flat Field EP's
« Reply #10 on: January 17, 2018, 12:21:23 AM »
Terra,What else is in your "eclectic eyepiece" collection? steve

frenafverbi

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Re: Astro-Tech Flat Field EP's
« Reply #11 on: January 18, 2018, 03:26:56 AM »
K5apl (also a ham-N7RMU), thanks for the info. Will check in that AT eyepiece. Sounds like a good one.

Cesar Taylor

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Re: Astro-Tech Flat Field EP's
« Reply #12 on: January 21, 2018, 03:38:27 PM »
Quote
These same eyepieces are available in about 5 focal lengths under several labels (most are more than the ATs):
Orion
Telescope Service
Smart Astronomy
SkyWatcher
Barsta (BST)
Levenhuk

Don, do you think these the same eyepieces as the ones you mention?

http://www.ebay.com/...XMAAOSwa~BYNp67

http://agenaastro.co...d-eyepiece.html

ricoperte

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Re: Astro-Tech Flat Field EP's
« Reply #13 on: January 23, 2018, 08:04:12 AM »
They're the same. I just went through this exercise with the 19mm.

teirazaro

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Re: Astro-Tech Flat Field EP's
« Reply #14 on: January 25, 2018, 08:13:11 PM »
Quote
Quote

These same eyepieces are available in about 5 focal lengths under several labels (most are more than the ATs):
Orion
Telescope Service
Smart Astronomy
SkyWatcher
Barsta (BST)
Levenhuk

Don, do you think these the same eyepieces as the ones you mention?

http://www.ebay.com/...XMAAOSwa~BYNp67

http://agenaastro.co...d-eyepiece.html

The Agena listing is one that Don mentioned. The Astromania looks like the back side to the BST, also mentioned by Don. Astromania also sells through Amazon for a dollar or so less.