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

100* Eyepieces

  • Please log in to reply
94 replies to this topic

#26 Starman1

Starman1

    Vendor (EyepiecesEtc.com)

  • *****
  • Vendors
  • Posts: 42740
  • Joined: 23 Jun 2003
  • Loc: Los Angeles

Posted 27 February 2018 - 06:32 PM

100-120° eyepieces (50 at last counting)

(the Zhumell/TMB are gone)

Brand   series   FL   Diam   AF in that order
   
Explore Scientific 120 Series 9.00 2.00 120
Altair Astro (UK) Lightwave Hyperwide Premium 20.00 2.00 100
Explore Scientific 100 Series 5.50 2.00 100
Explore Scientific 100 Series 9.00 2.00 100
Explore Scientific 100 Series 14.00 2.00 100
Explore Scientific 100 Series 20.00 2.00 100
Explore Scientific 100 Series 25.00 2.00 100
Explore Scientific 3" Series 30.00 3.00 100
Lunt/APM XWA HDC 3.50 1.25/2.00 110
Lunt/APM XWA HDC 4.77 1.25/2.00 110
Lunt/APM XWA HDC 9.00 1.25/2.00 100
Lunt/APM XWA HDC 13.00 1.25/2.00 100
Lunt/APM XWA HDC 20.00 2.00 100
Meade Mega Wide Angle 5.00 1.25 100
Meade Mega Wide Angle 10.00 1.25 100
Meade Mega Wide Angle 15.00 2.00 100
Meade Mega Wide Angle 21.00 2.00 100
Nikon NAV-HW 12.50 1.25/2.00 102
Nikon NAV-HW 17.00 2.00 102
Omegon Panorama II 5.00 1.25 100
Omegon Panorama II 10.00 1.25 100
Omegon Panorama II 15.00 2.00 100
Omegon Panorama II 21.00 2.00 100
Skywatcher Myriad 3.50 1.25/2.00 110
Skywatcher Myriad 5.00 1.25/2.00 110
Skywatcher Myriad 9.00 1.25/2.00 101
Skywatcher Myriad 20.00 2.00 100
Stellarvue Optimus 3.60 1.25/2.00 110
Stellarvue Optimus 4.70 1.25/2.00 110
Stellarvue Optimus 9.00 1.25/2.00 100
Stellarvue Optimus 20.00 2.00 100
Telescope Service XWA 3.50 1.25/2.00 110
Telescope Service XWA 5.00 1.25/2.00 110
Telescope Service SWA 5.00 1.25 100
Telescope Service SWA 10.00 1.25 100
Telescope Service SWA 15.00 2.00 100
Telescope Service SWA 21.00 2.00 100
Telescope Service XWA 9.00 1.25/2.00 100
Telescope Service XWA 20.00 2.00 100
TeleVue Ethos SX 3.70 1.25 110
TeleVue Ethos SX 4.70 1.25 110
TeleVue Ethos 6.00 1.25/2.00 100
TeleVue Ethos 8.00 1.25/2.00 100
TeleVue Ethos 10.00 1.25/2.00 100
TeleVue Ethos 13.00 1.25/2.00 100
TeleVue Ethos 17.00 2.00 100
TeleVue Ethos 21.00 2.00 100
William Optics XWA 3.50 1.25/2.00 110
William Optics XWA 5.00 1.25/2.00 110
William Optics XWA 9.00 1.25/2.00 101
William Optics XWA 20.00 2.00 101



#27 scarubia

scarubia

    Viking 1

  • -----
  • Posts: 531
  • Joined: 03 Jul 2011
  • Loc: Toronto, Canada.

Posted 27 February 2018 - 06:50 PM

Is the 65-70deg area of a 100deg EP better corrected than a 65-70deg EP? 



#28 Starman1

Starman1

    Vendor (EyepiecesEtc.com)

  • *****
  • Vendors
  • Posts: 42740
  • Joined: 23 Jun 2003
  • Loc: Los Angeles

Posted 27 February 2018 - 08:30 PM

In some cases, not all.

Because it depends on the correction of the 65-70° eyepiece at the edge (that varies a LOT) and it also depends on the 100° eyepiece.

I think the Ethos line at 65° of field is a lot better corrected than, say, the Vixen LVW at the edge of a 65° field in an f/5 scope.

But I wouldn't say it's any better at 65° than a Delos at 65°.

And if comparing some inexpensive 100° eyepieces, it would depend on the focal length--some focal lengths are better than others in most lines.

 

But, if you want to generalize, you could assume that the 100° eyepieces won't be worse than the 65-70° eyepieces at the same distance off axis and better than some.

And, you do get a lot more field.

The true field area of a 100° eyepiece is 2.37x as large as a 65° eyepiece of the same focal length!  That's a lot of real estate.


  • scarubia likes this

#29 Tom Masterson

Tom Masterson

    Mariner 2

  • *****
  • Posts: 284
  • Joined: 08 Aug 2009
  • Loc: Pacific Northwest - Astro-Hell

Posted 28 February 2018 - 01:10 AM

My God Don, looking at your list I'd say those mega-wide eyepiece have been breeding like wabbits!



#30 Shneor

Shneor

    Surveyor 1

  • *****
  • Posts: 1717
  • Joined: 01 Mar 2005
  • Loc: Northern California

Posted 28 February 2018 - 02:09 AM

 

 

Can anyone inform me of a 3mm eyepiece with a large apparent field of view?

if 3.7mm is "short enough" then there is the 3.7 Ethos.

 

Stellarvue 3.7 and it has gotten very good press.

 

2.5mm Nagler - 82* field. Wish someone would come out with a 2.5mm 110*...



#31 epee

epee

    Gemini

  • *****
  • Posts: 3377
  • Joined: 30 Nov 2006
  • Loc: Suh-van-nuh, Jaw-juh

Posted 28 February 2018 - 09:57 AM

I take it that 100* EPs generally are less well edge corrected than narrower FOV EPs?



#32 Jon Isaacs

Jon Isaacs

    ISS

  • *****
  • Posts: 78989
  • Joined: 16 Jun 2004
  • Loc: San Diego and Boulevard, CA

Posted 28 February 2018 - 10:11 AM

I take it that 100* EPs generally are less well edge corrected than narrower FOV EPs?

 

I think that depends on the particular eyepieces being compared . To my eye , the Ethos eyepieces I own,  the 21 mm , 13 mm and the 8 mm,  are as sharp at the edge as are my type 5 and type 6 Naglers. 

 

With widefield eyepieces, the wider the field , the more apparent are off axis aberrations of the telescope , primarily coma and field curvature , so in evaluating an eyepiece,  its best if one uses telescopes that are corrected for these aberrations.  I make my comparisons in my NP-101 and Newtonians fitted with a Paracorr. 

 

Other examples,  the 20 mm ES 100 degree never seemed as sharp off-axis as the 20 mm Type 2 Nagler so i could never quite decide which i preferred .  

 

Jon


  • havasman likes this

#33 Starman1

Starman1

    Vendor (EyepiecesEtc.com)

  • *****
  • Vendors
  • Posts: 42740
  • Joined: 23 Jun 2003
  • Loc: Los Angeles

Posted 28 February 2018 - 10:50 AM

I take it that 100* EPs generally are less well edge corrected than narrower FOV EPs?

Just as some 68° eyepieces are sharper at the edge than others with the same AFoV, the same is true of 100° eyepieces.

It's not possible to generalize.


  • Jon Isaacs and Shneor like this

#34 havasman

havasman

    Cosmos

  • ****-
  • Posts: 9839
  • Joined: 04 Aug 2013
  • Loc: Dallas, Texas

Posted 28 February 2018 - 03:57 PM

I take it that 100* EPs generally are less well edge corrected than narrower FOV EPs?

Some may be, Meades for instance. Mine are not, Ethos and APM/Lunt HDC. And I think most are not.

 

And the edge is so much further away from the center!



#35 drneilmb

drneilmb

    Viking 1

  • *****
  • Posts: 984
  • Joined: 05 Jan 2017
  • Loc: Decorah, IA, USA

Posted 28 February 2018 - 04:05 PM

100-120° eyepieces (50 at last counting)

(the Zhumell/TMB are gone)

Brand   series   FL   Diam   AF in that order
   
Explore Scientific 120 Series 9.00 2.00 120
Altair Astro (UK) Lightwave Hyperwide Premium 20.00 2.00 100
Explore Scientific 100 Series 5.50 2.00 100
Explore Scientific 100 Series 9.00 2.00 100
Explore Scientific 100 Series 14.00 2.00 100
Explore Scientific 100 Series 20.00 2.00 100
Explore Scientific 100 Series 25.00 2.00 100
Explore Scientific 3" Series 30.00 3.00 100
Lunt/APM XWA HDC 3.50 1.25/2.00 110
Lunt/APM XWA HDC 4.77 1.25/2.00 110
Lunt/APM XWA HDC 9.00 1.25/2.00 100
Lunt/APM XWA HDC 13.00 1.25/2.00 100
Lunt/APM XWA HDC 20.00 2.00 100
Meade Mega Wide Angle 5.00 1.25 100
Meade Mega Wide Angle 10.00 1.25 100
Meade Mega Wide Angle 15.00 2.00 100
Meade Mega Wide Angle 21.00 2.00 100
Nikon NAV-HW 12.50 1.25/2.00 102
Nikon NAV-HW 17.00 2.00 102
Omegon Panorama II 5.00 1.25 100
Omegon Panorama II 10.00 1.25 100
Omegon Panorama II 15.00 2.00 100
Omegon Panorama II 21.00 2.00 100
Skywatcher Myriad 3.50 1.25/2.00 110
Skywatcher Myriad 5.00 1.25/2.00 110
Skywatcher Myriad 9.00 1.25/2.00 101
Skywatcher Myriad 20.00 2.00 100
Stellarvue Optimus 3.60 1.25/2.00 110
Stellarvue Optimus 4.70 1.25/2.00 110
Stellarvue Optimus 9.00 1.25/2.00 100
Stellarvue Optimus 20.00 2.00 100
Telescope Service XWA 3.50 1.25/2.00 110
Telescope Service XWA 5.00 1.25/2.00 110
Telescope Service SWA 5.00 1.25 100
Telescope Service SWA 10.00 1.25 100
Telescope Service SWA 15.00 2.00 100
Telescope Service SWA 21.00 2.00 100
Telescope Service XWA 9.00 1.25/2.00 100
Telescope Service XWA 20.00 2.00 100
TeleVue Ethos SX 3.70 1.25 110
TeleVue Ethos SX 4.70 1.25 110
TeleVue Ethos 6.00 1.25/2.00 100
TeleVue Ethos 8.00 1.25/2.00 100
TeleVue Ethos 10.00 1.25/2.00 100
TeleVue Ethos 13.00 1.25/2.00 100
TeleVue Ethos 17.00 2.00 100
TeleVue Ethos 21.00 2.00 100
William Optics XWA 3.50 1.25/2.00 110
William Optics XWA 5.00 1.25/2.00 110
William Optics XWA 9.00 1.25/2.00 101
William Optics XWA 20.00 2.00 101

Don,

 

I know that you have lots of information about re-branding of identical OEM eyepieces. It looks to me from your list like there is a set of 20/9/5/3.5 OEM designs like those from William Optics, TS XWA, and Skywatcher (also Stellarvue and APM??) and also a set of 21/15/10/5 from Omegon, Meade, and TS SWA.

 

Do we know about the sourcing of these similar designs with different branding? Is there any way to know which ones on that list are actually the same? My conjecture (WAG) is that there are only five distinct families of 100+ degree eyepieces: Televue, ES, Nikon, and then two OEM families above. I imagine that one of the OEM sets comes from Barsta. Can someone find them somewhere on that crazy Barsta corporate website? Synta for the other one?

 

-Neil



#36 Starman1

Starman1

    Vendor (EyepiecesEtc.com)

  • *****
  • Vendors
  • Posts: 42740
  • Joined: 23 Jun 2003
  • Loc: Los Angeles

Posted 28 February 2018 - 04:50 PM

I suspect possibly KUO for one type.

I can't tell you for certain Barsta does not make one, but I think it would be on their website if they did.

There are a LOT of other companies that could be producers.



#37 faackanders2

faackanders2

    Fly Me to the Moon

  • *****
  • Posts: 6009
  • Joined: 28 Mar 2011

Posted 10 March 2018 - 01:22 PM

Page 66 of S&T April 2018 issue shows a new Omegon Panorama2 15mm 100 AFOV 2" eyepiece with 20mm ER, 21.2 oz (600gm), 4.6in (118mm) tall, and 229 euros.
First time I heard of this eyepiece from Landsberg, Germany.

Unsure if this is listed on the master list, but there are an enourmous amount of 100 AFOV competitors (so many it is hard to keep track).
This is proof TV charged above normal profits (losing their niche market which they created and chose not to protect via patent).
Economic theory states if you charge normal profits competitors will choose not to enter and not to compete, because they would not se it as viable with little hope of success.

P.S. Just double checked and it is one of 4 Omegon Panorama II 100 AFOV eyepieces on the list.

Edited by faackanders2, 10 March 2018 - 01:24 PM.

  • nicoledoula likes this

#38 junomike

junomike

    Hubble

  • *****
  • Moderators
  • Posts: 16951
  • Joined: 07 Sep 2009
  • Loc: Ontario

Posted 10 March 2018 - 01:34 PM

Page 66 of S&T April 2018 issue shows a new Omegon Panorama2 15mm 100 AFOV 2" eyepiece with 20mm ER, 21.2 oz (600gm), 4.6in (118mm) tall, and 229 euros.
First time I heard of this eyepiece from Landsberg, Germany.

Unsure if this is listed on the master list, but there are an enourmous amount of 100 AFOV competitors (so many it is hard to keep track).
This is proof TV charged above normal profits (losing their niche market which they created and chose not to protect via patent).
Economic theory states if you charge normal profits competitors will choose not to enter and not to compete, because they would not se it as viable with little hope of success.

P.S. Just double checked and it is one of 4 Omegon Panorama II 100 AFOV eyepieces on the list.

Same as the Meade MWA  which wasn't received very well (reviews). See this thread



#39 Starman1

Starman1

    Vendor (EyepiecesEtc.com)

  • *****
  • Vendors
  • Posts: 42740
  • Joined: 23 Jun 2003
  • Loc: Los Angeles

Posted 10 March 2018 - 02:55 PM

Page 66 of S&T April 2018 issue shows a new Omegon Panorama2 15mm 100 AFOV 2" eyepiece with 20mm ER, 21.2 oz (600gm), 4.6in (118mm) tall, and 229 euros.
First time I heard of this eyepiece from Landsberg, Germany.

Unsure if this is listed on the master list, but there are an enourmous amount of 100 AFOV competitors (so many it is hard to keep track).
This is proof TV charged above normal profits (losing their niche market which they created and chose not to protect via patent).
Economic theory states if you charge normal profits competitors will choose not to enter and not to compete, because they would not se it as viable with little hope of success.

P.S. Just double checked and it is one of 4 Omegon Panorama II 100 AFOV eyepieces on the list.

Not proof that TeleVue charged more than normal margins at all.

TeleVue doesn't source from China, which has FAR lower labor costs.

Also, TeleVue uses VERY expensive coatings, which add appreciably to the costs.

And TeleVue uses more elements in their design, which also adds to costs.

This is more of an indication that cheapening materials, labor, and manufacturing tolerances results in a lower cost product, something China excels at.

I note that no other manufacturers from the countries that make TeleVue eyepieces compete with TeleVue directly because costs are equally high (or higher).

A good example is the Japanese Type 6 Naglers versus the comparable Vixen SSWs.  Normal price on the Vixens is HIGHER than TeleVue.

Also, a good comparison might be the Nikon NAV-HW eyepieces versus the Ethos.

 

That they are not even close is exemplified by the weight: Omegon Panorama 21mm is 705g, and the TeleVue 21mm is 1022g.

The Omegon also has only 7 elements.

 

That in no way means the Omegon Panorama may not be a decent eyepiece.  In retail, there are always several price points for every product.

You can buy a decent mattress for $400 and a mattress for $3000.  They are not the same.


  • Jon Isaacs and Jay_Bird like this

#40 faackanders2

faackanders2

    Fly Me to the Moon

  • *****
  • Posts: 6009
  • Joined: 28 Mar 2011

Posted 11 March 2018 - 02:19 AM

Not proof that TeleVue charged more than normal margins at all.
TeleVue doesn't source from China, which has FAR lower labor costs.
Also, TeleVue uses VERY expensive coatings, which add appreciably to the costs.
And TeleVue uses more elements in their design, which also adds to costs.
This is more of an indication that cheapening materials, labor, and manufacturing tolerances results in a lower cost product, something China excels at.
I note that no other manufacturers from the countries that make TeleVue eyepieces compete with TeleVue directly because costs are equally high (or higher).
A good example is the Japanese Type 6 Naglers versus the comparable Vixen SSWs.  Normal price on the Vixens is HIGHER than TeleVue.
Also, a good comparison might be the Nikon NAV-HW eyepieces versus the Ethos.
 
That they are not even close is exemplified by the weight: Omegon Panorama 21mm is 705g, and the TeleVue 21mm is 1022g.
The Omegon also has only 7 elements.
 
That in no way means the Omegon Panorama may not be a decent eyepiece.  In retail, there are always several price points for every product.
You can buy a decent mattress for $400 and a mattress for $3000.  They are not the same.

You can't honestly say all this extra competition has not hurt TV's sales of 100-110 AFOV Ethos eyepieces. When TV was the only niche supplier one had to buy from them, now there are so many other choices.
Most that buy one focal length will not likely buy another in the same class of AFOV (except some cloufy night members who buy and sell used to upgrade, and it was only the initial buyer who helped TV's revenues and profits).

All bussinesses enter the markets where they perceive the profits are greatest. Niche markets are omly preserved when potential competitors feel the risks are too great to enter so they do not bother.

#41 faackanders2

faackanders2

    Fly Me to the Moon

  • *****
  • Posts: 6009
  • Joined: 28 Mar 2011

Posted 11 March 2018 - 02:47 AM

100-120° eyepieces (50 at last counting)
(the Zhumell/TMB are gone)
Brand   series   FL   Diam   AF in that order
   
...
Nikon NAV-HW 12.50 1.25/2.00 102
Nikon NAV-HW 17.00 2.00 102
...


You should list these as:

Nikon NAV-HW 12.50 w/ EIC 10 1.25/2.00 102
Nikon NAV-HW 17.00 w/ EIC 14 2.00 102

Since they really are two eyepieces in one, and compete in both of these focal length markets, although it only counts as one sale for NIKON.

#42 Jon Isaacs

Jon Isaacs

    ISS

  • *****
  • Posts: 78989
  • Joined: 16 Jun 2004
  • Loc: San Diego and Boulevard, CA

Posted 11 March 2018 - 05:11 AM

You can't honestly say all this extra competition has not hurt TV's sales of 100-110 AFOV Ethos eyepieces. When TV was the only niche supplier one had to buy from them, now there are so many other choices.
Most that buy one focal length will not likely buy another in the same class of AFOV (except some cloufy night members who buy and sell used to upgrade, and it was only the initial buyer who helped TV's revenues and profits).

All bussinesses enter the markets where they perceive the profits are greatest. Niche markets are omly preserved when potential competitors feel the risks are too great to enter so they do not bother.

 

This is what you wrote:

 

"This is proof TV charged above normal profits (losing their niche market which they created and chose not to protect via patent)."

 

Obviously the existence of a less expensive product that does not perform as well is not proof of anything.  

 

If anyone is getting rich of the invention of the Ethos eyepiece, it's not TeleVue, it's Explore Scientific and the rest who benefited from TeleVue's expertise. 

 

As far as most not upgrading...  I would never have purchased a 21mm Ethos if I had not first purchased the 20mm Explore Scientific 100 degree.  I think buying into the market and then upgrading to a higher quality product is very common, it's probably more common than starting at the top.  You get your feet wet, figure out the limitations of the existing product and move on up. 

 

With the 20mm ES 100 degree, I could never quite decide between it and the 20mm Type 2 Nagler. The Nagler had the narrower field of view but in all other aspects, I preferred it.  One I purchased the 21mm Ethos, there was no doubt which I preferred and which was the better 100 degree eyepiece.  

 

Jon


  • Jay_Bird likes this

#43 faackanders2

faackanders2

    Fly Me to the Moon

  • *****
  • Posts: 6009
  • Joined: 28 Mar 2011

Posted 15 March 2018 - 09:27 PM

This is what you wrote:
 
"This is proof TV charged above normal profits (losing their niche market which they created and chose not to protect via patent)."
 
Obviously the existence of a less expensive product that does not perform as well is not proof of anything.  ...

Jon


To keep (be the sole supplier) of a niche market the firm must not charge much above normal profits, or they will risk other competitors entering this niche market"

Some just get upset when I use TV Ethos example, but there are many other niche market examples.

#44 Shneor

Shneor

    Surveyor 1

  • *****
  • Posts: 1717
  • Joined: 01 Mar 2005
  • Loc: Northern California

Posted 16 March 2018 - 12:55 AM

I don't believe any eyepiece vendor or manufacturer is making an abnormal profit. Once the design and factory setup costs have been covered, we begin to see sales and discounted prices. Those initial ("sunk") costs require the higher initial price, and it's natural to want to recoup those costs as soon as reasonably possible. If the price is too high for the item to sell, the manufacturer could be out a lot of $$. Knowing the market and estimating sales accurately must always be the goal for a new product.


  • Jon Isaacs likes this

#45 Ernest_SPB

Ernest_SPB

    Apollo

  • *****
  • Posts: 1337
  • Joined: 13 Nov 2010
  • Loc: St.-Petersburg, Russia

Posted 16 March 2018 - 02:31 AM

I take it that 100* EPs generally are less well edge corrected than narrower FOV EPs?

Any answer (positive or negative) will be too generic. Correct answer can be done only comparing pair of EPs (specifying their brand/model/FL). E.g. 17 mm Ethos has field correction similar to 16 mm Nagler, better then 18 mm Radian, much better then 19 mm Panoptic. In average 100-deg. EP-s mostly have better field correction then 65-70-deg. eyepieces. 


Edited by Ernest_SPB, 16 March 2018 - 05:30 AM.

  • Jon Isaacs likes this

#46 Jon Isaacs

Jon Isaacs

    ISS

  • *****
  • Posts: 78989
  • Joined: 16 Jun 2004
  • Loc: San Diego and Boulevard, CA

Posted 16 March 2018 - 05:44 AM

 

 

This is what you wrote:

"This is proof TV charged above normal profits (losing their niche market which they created and chose not to protect via patent)."

Obviously the existence of a less expensive product that does not perform as well is not proof of anything.  ...

Jon

 

 

To keep (be the sole supplier) of a niche market the firm must not charge much above normal profits, or they will risk other competitors entering this niche market"

Some just get upset when I use TV Ethos example, but there are many other niche market examples.

 

 

Your logic does not follow.  So far, I have seen no proof that TV charged above normal profits. 

 

 In fact just the opposite.  The players other than Nikon in the 100 degree eyepiece market are not competing with TV on quality.  The niche of TeleVue is to provide the highest quality eyepieces. Nikon 102 degree eyepieces are actually more expensive. 

 

Jon



#47 payner

payner

    Surveyor 1

  • *****
  • Posts: 1715
  • Joined: 22 Mar 2007
  • Loc: Bluegrass Region & Cumberland Valley, Kentucky

Posted 16 March 2018 - 12:03 PM

They are actually priced a bit below the Ethos if one considers you are getting two focal lengths for the price of the one.  The problem with the two eyepieces for the price of one 'deal' is the focal lengths using the EiC lens may be too close for some to make it meaningful to use as such.

 

Randy



#48 Alan A.

Alan A.

    Viking 1

  • -----
  • Posts: 556
  • Joined: 08 Feb 2007
  • Loc: San Francisco

Posted 16 March 2018 - 12:16 PM

Hi,

A couple of years ago Vic Maris set up right next to me at a star party. We had a chance to look through his 20 Optimus and compared it with the 21 Ethos. We only did this for about 15 minutes, but I was impressed by how close the image from the Optimus was to the Ethos.

Given the Optimus is so much less expensive, I thought there would be more buzz about this line, but perhaps I just missed the threads on these eyepieces.

Best,

Alan

#49 vkhastro1

vkhastro1

    Apollo

  • *****
  • Posts: 1201
  • Joined: 21 Aug 2005
  • Loc: Vankleek Hill, Ontario, Canada

Posted 16 March 2018 - 12:31 PM

Hi,

A couple of years ago Vic Maris set up right next to me at a star party. We had a chance to look through his 20 Optimus and compared it with the 21 Ethos. We only did this for about 15 minutes, but I was impressed by how close the image from the Optimus was to the Ethos.

Given the Optimus is so much less expensive, I thought there would be more buzz about this line, but perhaps I just missed the threads on these eyepieces.

Best,

Alan

 

The Stellarvue Optimus 20mm is optically identical to the APM/Lunt 20mm HDC 100° eyepiece, William Optics 20mm XWA 100° eyepiece, among others.

Identical eyepiece design, different bodies.

I concur on the optical quality of my Lunt/APM 20mm HDC 100° eyepiece !!


  • drneilmb likes this

#50 Illinois

Illinois

    Gemini

  • *****
  • Posts: 3052
  • Joined: 18 Dec 2006
  • Loc: near Dixon, Illinois USA

Posted 17 March 2018 - 06:25 AM

I love my ES 5.5mm 100 deg because Its only one that I know so far is 2 inch diameter for planetary! I can see E and F stars at only 173 power in my 5 inch apo refractor. Super view on Jupiter and Saturn. Someday to get 6 inch 1200mm apo refractor would be perfect for my ES5.5 100mm for planetary!




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