Jump to content


Photo

Astro Tech AF 70 eyepieces?

  • Please log in to reply
25 replies to this topic

#1 rguasto

rguasto

    Viking 1

  • *****
  • Posts: 767
  • Joined: 18 Nov 2010
  • Loc: Long Island, NY

Posted 30 November 2010 - 05:33 PM

Anyone have experience with the Astro Tech AF 70 eyepieces - looking at the 17mm.
Thanks,
-Rob

#2 Lane

Lane

    Soyuz

  • -----
  • Posts: 3586
  • Joined: 19 Nov 2007
  • Loc: Frisco, Texas

Posted 30 November 2010 - 07:42 PM

Very few of the Astro-Tech eyepieces are mentioned out here. I would really like to read some reports on them, so if you eventually buy one then tell us what you think after you try it out.

#3 Jerry Hyman

Jerry Hyman

    Messenger

  • -----
  • Posts: 491
  • Joined: 29 Mar 2007
  • Loc: Mesa, Arizona

Posted 30 November 2010 - 07:50 PM

I have the 22mm and 13mm on the way. After I have used them I will give a report.

I posted a similar question here recently and one person suggested that they are the same as the Celestron LX series repackaged. After comparing the specs he may be correct.

Right now they are on sale for $99.00 each!

~jerry

#4 rguasto

rguasto

    Viking 1

  • *****
  • Posts: 767
  • Joined: 18 Nov 2010
  • Loc: Long Island, NY

Posted 30 November 2010 - 08:12 PM

Thanks,
That's what I thought. Probably why I can't find any reviews, anywhere.
-Rob

#5 David E

David E

    Aurora

  • *****
  • Posts: 4709
  • Joined: 25 May 2006
  • Loc: North Carolina

Posted 01 December 2010 - 05:57 PM

Jerry, looking forward to your report here. Just a hunch but looking at the eyepieces on Astronomic's website and comparing their focal lengths I'd say they would perform on par with the Baader Hyperion/Orion Stratus lines. If so, they'd be a really nice eyepiece for a great price. :)

#6 Phillip Creed

Phillip Creed

    Idiot Seeking Village

  • *****
  • Moderators
  • Posts: 2086
  • Joined: 25 Jul 2006
  • Loc: Canton, OH

Posted 01 December 2010 - 06:38 PM

The AF-70's appear to be clones of the unfortunately bulky Celestron Ultima LX series. So if you can find a review of the 17mm Celestron Ultima LX, you'll probably have a good idea of what to expect with the 17mm AF-70.

I haven't tried the 17mm, but I did have the 22mm and the 13mm, both tested with an f/5 achromatic refractor and an f/4.9 dob.

The 13mm is sharp out to about 75%-80% from center, where a combination of lateral color, off-axis astigmatism and field curvature starts to deform the stars towards the edge of the FOV.

The 22mm AF-70, though, is one of the best-kept secrets among mid-range eyepieces. It's sharp to about 85-90% from center (again, these are fast scopes I tested them in). Lateral color, off-axis astigmatism and field curvature soften the edges, but noticeably less than the 13mm. The 22mm AF-70 also has a field stop of about 28mm, which is far more than a similar-priced 21mm Hyperion. Edge correction in the 22AF-70 is *much* better than a 21mm Hyperion.

A Paracorr sharpens the 13mm noticeably, but not greatly. The 22mm, though, is very sharp with a Paracorr, as it takes care of most of the field curvature at the edge. It's a beautiful combo.

If you're using any scope of f/6 or slower or a Paracorr with a Newtonian, the AF-70s will work fine.

Clear Skies,
Phil

#7 Djarum

Djarum

    Viking 1

  • *****
  • Posts: 836
  • Joined: 12 Mar 2009
  • Loc: Huntsville, Al

Posted 02 December 2010 - 11:36 AM

I was thinking about getting a 13mm. I wonder if the 17mm is sharper than the 13mm.

#8 rguasto

rguasto

    Viking 1

  • *****
  • Posts: 767
  • Joined: 18 Nov 2010
  • Loc: Long Island, NY

Posted 02 December 2010 - 12:05 PM

I have the 17 on order. Will let you know how it is in my 8" F8 Newt. I see you have a paradigm 25mm - like it?

#9 russell23

russell23

    Skylab

  • *****
  • Posts: 4283
  • Joined: 31 May 2009
  • Loc: Upstate NY

Posted 02 December 2010 - 12:23 PM

They are on sale for $99.95 right now.

#10 dscarpa

dscarpa

    Gemini

  • *****
  • Posts: 3006
  • Joined: 15 Mar 2008
  • Loc: San Diego Ca.

Posted 02 December 2010 - 12:29 PM

If you don't mind paying twice as much the WO 16 UWAN is a excellent eyepiece, I traded my Hyperion 17 and 24 for one a couple of weeks ago. It's performance is very similar to my Nagler T6s for both lunar-planetary and DSOs. The UWAN gives me more power than the 17 Hyperion and the true FOV of the 24. David

#11 rguasto

rguasto

    Viking 1

  • *****
  • Posts: 767
  • Joined: 18 Nov 2010
  • Loc: Long Island, NY

Posted 02 December 2010 - 01:01 PM

Not really in the budget - I'll get (need) 2 ep's and a full tank of gas in the car for that! Maybe someday. I have been attracted to that ep though!

#12 dscarpa

dscarpa

    Gemini

  • *****
  • Posts: 3006
  • Joined: 15 Mar 2008
  • Loc: San Diego Ca.

Posted 02 December 2010 - 03:24 PM

It wasn't really in my budget either nor was the T6 I bought used in October. If I didn't have the Hyperions to trade I wouldn't have gotten it. I bought it at OPT on their no sales tax or 10% off weekend for $220. There was a post on C.N. here about 6 months ago from someone who got the AFs to use as second string to his premium eyepieces. He like them a lot except for a optical issue with the 8. I think he had the 17. David

#13 Djarum

Djarum

    Viking 1

  • *****
  • Posts: 836
  • Joined: 12 Mar 2009
  • Loc: Huntsville, Al

Posted 02 December 2010 - 04:03 PM

I have the 17 on order. Will let you know how it is in my 8" F8 Newt. I see you have a paradigm 25mm - like it?


Sharper than a plossl, but my 24mm meade is much sharper toward the edge. It has good eye relief and seems like it has slightly higher transmission than the meade.

#14 Jerry Hyman

Jerry Hyman

    Messenger

  • -----
  • Posts: 491
  • Joined: 29 Mar 2007
  • Loc: Mesa, Arizona

Posted 07 December 2010 - 11:02 PM

Well they finally arrived and I should be able to test them this week. I will be comparing the 22mm to my Panoptic 22mm, and a Denk 21mm. The 13mm will be pitted against my 14mm ES100, 12.5 flat field, and 12.5 Sterling. I will be using a 8" f10 EdgeHD and f5.6 10" Dob.

~jerry

#15 cheapersleeper

cheapersleeper

    Gemini

  • *****
  • Posts: 3162
  • Joined: 22 Jan 2010
  • Loc: Sachse TX

Posted 07 December 2010 - 11:26 PM

Hey, Jerry, I am really looking forward to seeing what you think. I need an eyepiece somewhere around that focal length and am not sure what to get.

Regards,
Brad

#16 rguasto

rguasto

    Viking 1

  • *****
  • Posts: 767
  • Joined: 18 Nov 2010
  • Loc: Long Island, NY

Posted 09 December 2010 - 10:40 AM

Received the 17mm 3 days ago. Cannot review the eyepiece in a technical fashion, but I can tell you that the views are fantastic. this is my best EP, image quality is equal to my TV 11mm Plossl. The wide FOV is amazing, Saturn, Jupiter, Orion and Andromeda are impressive. Barlow's very well for a mag of ~188x in my criterion 8" F8. Excellent detail on planets. $107 delivered is unbeatable! I'm not really a fan of long eye relief, I actually like the 8mm of relief the TV Plossl provides - it's nice to have to rest your orbit on the rubber eyecup (my wife agrees) This was money well spent!

#17 scott m

scott m

    Ranger 4

  • *****
  • Posts: 395
  • Joined: 06 Dec 2007
  • Loc: Hatfield Pa

Posted 09 December 2010 - 01:03 PM

What telescope did you use this in?

#18 rguasto

rguasto

    Viking 1

  • *****
  • Posts: 767
  • Joined: 18 Nov 2010
  • Loc: Long Island, NY

Posted 09 December 2010 - 01:26 PM

What telescope did you use this in?

criterion 8" f8 dynascope

#19 Feidb

Feidb

    Surveyor 1

  • -----
  • Posts: 1691
  • Joined: 09 Oct 2009
  • Loc: Nevada

Posted 09 December 2010 - 03:26 PM

Ah, now that's a classic scope. Not many of the 8's around. I used the old RV-6 for a while when I was a kid. Wasn't mine. Sorry to get off topic.

#20 Scanning4Comets

Scanning4Comets

    Markus

  • *****
  • Posts: 13534
  • Joined: 26 Dec 2004

Posted 27 March 2012 - 12:39 AM

What is the 17mm like in a short FL scope? What about the 22mm in a short FL scope?

#21 tonyt

tonyt

    Viking 1

  • -----
  • Posts: 757
  • Joined: 01 Sep 2009
  • Loc: Australia

Posted 27 March 2012 - 05:01 AM

I've used 22mm and 17mm in the astro-tech AF and bulky celestron versions. Both eyepieces handled fast scopes well. The AF is aesthetically nicer but the Celestron LX is more comfortable to use with it's adjustable eyeguard.

Tony

#22 SStoffer

SStoffer

    Vostok 1

  • -----
  • Posts: 111
  • Joined: 15 Apr 2011
  • Loc: Grand Rapids, Michigan

Posted 27 March 2012 - 12:53 PM

I have both the 13 mm and 17 Celestron Ultima LX. The 17 is great, one of my best eyepieces. However, the 13 has an annoying field darkening near the center of field surrounded by a lighter field of view near the edges. I like my fields to be more uniform in appearance.

I also have the 32 mm which is used as my finder eyepiece for my LightBridge. The edge of field performance I tried to improve with an Baader MPCC coma corrector and visual ring set. But so far just minimal improvement.

- Stephen

#23 Scanning4Comets

Scanning4Comets

    Markus

  • *****
  • Posts: 13534
  • Joined: 26 Dec 2004

Posted 17 November 2012 - 01:24 PM

Thanks you guys! I bought the 17mm and really like it!

Cheers,

#24 Starman1

Starman1

    Vendor (EyepiecesEtc.com)

  • *****
  • Vendors
  • Posts: 22581
  • Joined: 23 Jun 2003
  • Loc: Los Angeles

Posted 17 November 2012 - 05:58 PM

I have both the 13 mm and 17 Celestron Ultima LX. The 17 is great, one of my best eyepieces. However, the 13 has an annoying field darkening near the center of field surrounded by a lighter field of view near the edges. I like my fields to be more uniform in appearance.

I also have the 32 mm which is used as my finder eyepiece for my LightBridge. The edge of field performance I tried to improve with an Baader MPCC coma corrector and visual ring set. But so far just minimal improvement.

- Stephen

I'm very sensitive to such things and didn't see that in the 13. I believe you might have been holding your eye a little too close to the lens. It's easy to do on the shorter focal lengths.
I presume you mean 22mm on the LB finder.

#25 SStoffer

SStoffer

    Vostok 1

  • -----
  • Posts: 111
  • Joined: 15 Apr 2011
  • Loc: Grand Rapids, Michigan

Posted 19 November 2012 - 03:15 AM


Quote:
--------------------------------------------------------------------------------

I have both the 13 mm and 17 Celestron Ultima LX. The 17 is great, one of my best eyepieces. However, the 13 has an annoying field darkening near the center of field surrounded by a lighter field of view near the edges. I like my fields to be more uniform in appearance.

I also have the 32 mm which is used as my finder eyepiece for my LightBridge. The edge of field performance I tried to improve with an Baader MPCC coma corrector and visual ring set. But so far just minimal improvement.

- Stephen


--------------------------------------------------------------------------------


I'm very sensitive to such things and didn't see that in the 13. I believe you might have been holding your eye a little too close to the lens. It's easy to do on the shorter focal lengths.
I presume you mean 22mm on the LB finder.

------------------------------------------------------------

No, it is the 32mm Celestron Ultima LX on the LB finder.

Also, you may be right on the 13, the last time I used it I didn't see the edge of field brightening. But the times I have seen it it was only with this eyepiece.

Clear Skies, Stephen






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics