Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Olivon 22mm 70 deg eyepiece

  • Please log in to reply
137 replies to this topic

#126 EuropaWill

EuropaWill

    Apollo

  • *****
  • Posts: 1155
  • Joined: 12 Feb 2009
  • Loc: Lower Hudson Valley NY

Posted 14 August 2015 - 09:03 AM

Since this is not a scaled design each focal length must be tested individually for this. The 22mm performance characteristics should not be assumed the same in the shorter FL's. 


  • Starman1 likes this

#127 25585

25585

    Fly Me to the Moon

  • *****
  • Posts: 5028
  • Joined: 29 Aug 2017
  • Loc: In a valley, in the UK.

Posted 17 July 2019 - 08:02 AM

That answer will vary, since different glasses wearers have different requirements in that regard. But it has a large "effective" eye relief, which is what counts, just like the TeleVue Delos, Pentax XW, Baader Hyperion, Vixen LVW, and several other 70 degree eyepieces with long eye relief. The AT AF70's extra-stiff eyecup reduces its effective eye relief, though it can be removed or folded down.

I would think very few eyeglass wearers would find the eye relief too small. I would put the eye relief at about 17mm above the eyecup when the eyecup is rolled in all the way, and 20mm from the lens.

Design allowing closeness to the eye lens is important for those who wear glasses. Compare with the Sky Watcher version, and Celestron 22mm Ultima LX, and you see that the Celestron has the least recessed, down-cupped eye end, it is also exclusively 2" fit.

 

 

Attached Thumbnails

  • ath1-annuncio_71975_141724_DSCN2715.jpeg
  • post-32516-0-18540300-1385461438.jpg

Edited by 25585, 17 July 2019 - 08:39 AM.


#128 Starman1

Starman1

    Vendor (EyepiecesEtc.com)

  • *****
  • Vendors
  • Posts: 42392
  • Joined: 23 Jun 2003
  • Loc: Los Angeles

Posted 17 July 2019 - 08:37 AM

In the Olivon version of he same eyepiece, the top is flat and no rubber eyecup projects above the flat surface top.

The Omegon Redline is identical to the Arcturus Ebony, Telescope Service Expanse ED, Astromania SWA, and the discontinued Astrotech AF70, with a very stiff eyecup sticking up many millimeters.

The shape of the discontinued Celestron Ultima LX and the SkyWatcher SWA are somewhat, uh, unique.


  • howardcano and 25585 like this

#129 25585

25585

    Fly Me to the Moon

  • *****
  • Posts: 5028
  • Joined: 29 Aug 2017
  • Loc: In a valley, in the UK.

Posted 17 July 2019 - 08:43 AM

In the Olivon version of he same eyepiece, the top is flat and no rubber eyecup projects above the flat surface top.

The Omegon Redline is identical to the Arcturus Ebony, Telescope Service Expanse ED, Astromania SWA, and the discontinued Astrotech AF70, with a very stiff eyecup sticking up many millimeters.

The shape of the discontinued Celestron Ultima LX and the SkyWatcher SWA are somewhat, uh, unique.

Would you say, with its eyecup down, the Olivon has more effective eye relief than the Celestron? 



#130 russell23

russell23

    Cosmos

  • *****
  • topic starter
  • Posts: 9822
  • Joined: 31 May 2009
  • Loc: Upstate NY

Posted 17 July 2019 - 08:47 AM

Would you say, with its eyecup down, the Olivon has more effective eye relief than the Celestron? 

Yes.  It had plenty for my glasses.  And it has a really nice, simple twist up eyecup design.  Very smooth and effective - although it cannot raise as much as what you get with the TV DeLite's and Delos. 


  • 25585 likes this

#131 howardcano

howardcano

    Viking 1

  • *****
  • Posts: 517
  • Joined: 06 Aug 2017
  • Loc: Olathe, KS

Posted 17 July 2019 - 08:49 AM

With my thick glasses, I'm nearly worst-case for eye relief requirements.  The Olivon 22mm is right at my limit.  In conjunction with the ES 68 28mm, they bracket my desired focal length of 25mm.  I'd rather have purchased a 25mm Delite!  On the other hand, they give useable options when we have more than one scope simultaneously in use.



#132 25585

25585

    Fly Me to the Moon

  • *****
  • Posts: 5028
  • Joined: 29 Aug 2017
  • Loc: In a valley, in the UK.

Posted 17 July 2019 - 08:55 AM

How heavy is the Olivon 22mm being 1.25". The Celestron is proper 2" for weight, but tough & roll-proof, good for outreach! 



#133 howardcano

howardcano

    Viking 1

  • *****
  • Posts: 517
  • Joined: 06 Aug 2017
  • Loc: Olathe, KS

Posted 17 July 2019 - 09:02 AM

How heavy is the Olivon 22mm being 1.25". The Celestron is proper 2" for weight, but tough & roll-proof, good for outreach! 

Mine weighs in at 505g.  And it's 2" only, despite the incorrect labeling.

 

The eyecup can be removed for an extra 2mm or so eye relief.


Edited by howardcano, 17 July 2019 - 09:03 AM.

  • 25585 likes this

#134 25585

25585

    Fly Me to the Moon

  • *****
  • Posts: 5028
  • Joined: 29 Aug 2017
  • Loc: In a valley, in the UK.

Posted 17 July 2019 - 09:07 AM

Mine weighs in at 505g.  And it's 2" only, despite the incorrect labeling.

Thanks, about the same then.

 

TS has their own version, with a screw-off rim for afocal use.



#135 Usquebae

Usquebae

    Viking 1

  • *****
  • Posts: 828
  • Joined: 11 Jun 2013
  • Loc: 43° N, 73° W

Posted 18 July 2019 - 07:01 AM

TS has their own version, with a screw-off rim for afocal use.

The TS design looks identical to the old Astrotech AF70 design.  I have the 17mm.  After stripping the top assembly I found a  common sized rubber eyeguard that fit perfectly on the threaded ridge around the eye lens.  I think the eye guard came from a Meade 4000 8.8 UWA, and is the same size as fits on ES68 24mm, and others.  I think the Baader winged eye guard is also about the same size.  Anyhow, in this arrangement my AF70 works great with or without glasses and is a great choice for outreach.  These 1.25"/2" combos with the screw-off barrel are also convenient for filter use:  put a 2" nebula filter on the EP and when you wanna use unfiltered view, just unscrew the 2" barrel and set it upside down on your table with the lens cap covering the filter.  Much easier than putting the filter on & off, especially through the 6 months of winter.


  • 25585 likes this

#136 25585

25585

    Fly Me to the Moon

  • *****
  • Posts: 5028
  • Joined: 29 Aug 2017
  • Loc: In a valley, in the UK.

Posted 23 July 2019 - 04:59 PM

I have bought a TS version to compare with the Celestron Ultima LX. The latter with a GSO 2x 2" Barlow gives a good 11mm eyepiece.



#137 Starman1

Starman1

    Vendor (EyepiecesEtc.com)

  • *****
  • Vendors
  • Posts: 42392
  • Joined: 23 Jun 2003
  • Loc: Los Angeles

Posted 23 July 2019 - 08:15 PM

This series seems to be best in the 22mm focal length--unusually so.

The Vixen LVW has long had the reputation of also being best in the 22mm length, and the Baader Hyperion in the 21mm.

I think they may all be derived from the LVW's design, so this is not surprising news.


  • 25585 likes this

#138 25585

25585

    Fly Me to the Moon

  • *****
  • Posts: 5028
  • Joined: 29 Aug 2017
  • Loc: In a valley, in the UK.

Posted 24 July 2019 - 06:57 AM

Vixen & Hyperion are 1.25", but Celestron & Olivon are 2". 

 

I know the Orion LVW version was optically identical to Vixen's own, but the Hyperion is 68° to LVW's 65°, the latter nearer to those 2" 22mm eps. A 22-5mm Delite would be great, and not really rival the 22T4.

 

I have not tried any Hyperion, but there is a review online by John Huntley comparing them with LVWs, the latter coming out ahead. 68° for 22mm must be close to the 1.25" limit I imagine




CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics