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21mm Ethos - how is it?

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#26 junomike

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Posted 20 April 2019 - 08:50 AM

The 21 mm Ethos is one of my favorites. I bought one then thought I could replace it with a 31 mm Nagler so I sold the 21E. After about 6 months, I realized my mistake and got a replacement. 

IME the opposite is true as some have sold off the 31T5 once acquiring the 21E and soon regretted it and eventually re-acquired the 31T5.


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#27 Scott in NC

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Posted 20 April 2019 - 11:16 AM

I'm on my second (and I believe final) 21mm Ethos now.  I had one, then decided it was a lot of money to have tied up in a single eyepiece, and sold it to a fellow CN'er.  I thought I'd make do with my 31T5 Nagler instead (yet another eyepiece that I owned, then sold, then rebought).  But after not too long (less than a month, in fact), I came to my senses and realized that both the 21E and 31T5 had their niches.  So now I'm a happy owner of both, and plan to stay one for a long, long time.  I think I'm just about done playing the eyepiece merry-go-round now, as I'm happy with what I have.  ubetcha.gif

Nearly 3 years later that 21E is still a keeper, as is the 31T5.  They're both coexisting quite happily in my eyepiece lineup (although there's not room for them to reside simultaneously in my primary eyepiece case). grin.gif


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#28 Tank

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Posted 20 April 2019 - 11:30 AM

Think the 21E and the 31t5 work great as a low mag combo
However feel the 31 and 17E or the 17 ES92 work better for my scopes better mag spread
Or have all no holes
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#29 CrazyPanda

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Posted 21 April 2019 - 07:02 AM

It's awesome. More comfortable to look through than my 8 Ethos.


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#30 qaiden

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Posted 23 April 2019 - 01:20 AM

If budget is a concern, you should try an apm xwa 20mm.

I have the 13mm and it is fantastic. 

But I never had an ethos ... for budget reasons :) ... so i can't compare.


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#31 havasman

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Posted 23 April 2019 - 01:37 AM

21 Ethos is excellent, one of the best.

 

However I am very comfortable with the APM HDC 20mm (like the XWA several companies offer(ed) versions of but w/o the eyecup that didn't work for me) in tandem with the 31T5. The two do not duplicate each other as observing tools in my scopes.


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#32 Piero DP

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Posted 23 April 2019 - 02:15 AM

I agree with the above. The Lunt/APM HDC 20mm is a great eyepiece in my opinion. It is also substantially lighter than the ethos 21mm.

#33 Sarkikos

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Posted 23 April 2019 - 12:42 PM

I have the 21 Ethos and the 31 Nagler and I'm keeping both.

 

Mike


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#34 vkhastro1

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Posted 23 April 2019 - 02:04 PM

Definitely agree on the Lunt 20/APM HDC eyepiece.

I also own the TV 21mm Ethos - gets minimal use.

 

The APM/Lunt 20mm 100° is 95% optically with respect to the TV 21mm Ethos.

Definitely a bargain $-wise.

I use my "extra" Lunt/APM 20mm dedicated for filter use.

 

Very highly recommended !!


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#35 turtle86

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Posted 23 April 2019 - 10:13 PM

IME the opposite is true as some have sold off the 31T5 once acquiring the 21E and soon regretted it and eventually re-acquired the 31T5.

That’s what I did! :grin:


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#36 Sarkikos

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Posted 24 April 2019 - 05:25 AM

I'm keeping all my top-tier eyepieces.  I'm done selling off good gear.

 

Mike


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#37 leetje

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Posted 19 September 2019 - 11:56 PM

I find it excellent in all my telescopes.  I still have a 20mm XW also, but I probably use the 21mm Ethos more (used to be the reverse).

 

Mike

Hello, I’m curious, when you say XW do you mean the Lunt APM XWA 20mm? I’m trying to decide between the two, for my Obsession 15” Dob. Did you find the Ethos 21” gave nicer views and outperformed the XW 20” in the end? There’s a huge 2-3x difference in price between the ethos and XW. Thanks



#38 Starman1

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Posted 20 September 2019 - 12:41 AM

I suspect he is referring to a 20mm Pentax XW eyepiece.

I've compared the 20mm APM with the 21mm Ethos, and the outer field in the APM is not free of astigmatism at f/5.75 (coma-corrected f/5), while the 21mm Ethos

is better corrected.  Is that worth more than twice the price?  That decision is up to you.

The current price of the Pentax XW is <1/3 the price of the Ethos, but it is only 70°, unlike the 100° fields of the APM XWA HDC 20mm and the TeleVue Ethos 21mm.

Post #34 sums it up, but I don't really understand why he doesn't use his 21mm Ethos.  Perhaps he doesn't often use that focal length.

I'm the same way--I usually start with 13mm and go shorter on many/most targets.


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#39 Roragi

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Posted 20 September 2019 - 01:40 AM

It is my eyepiece of greater visual field, really comfortable to use when putting the eye, nothing to do with the N31 that gives blackouts, from my point of view far exceeds this popular eyepiece by far.



#40 Starman1

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Posted 20 September 2019 - 08:59 AM

It is my eyepiece of greater visual field, really comfortable to use when putting the eye, nothing to do with the N31 that gives blackouts, from my point of view far exceeds this popular eyepiece by far.

Sorry, I'm lost.  Are you referring to the 21 Ethos in the subject of the thread?



#41 rkelley8493

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Posted 20 September 2019 - 11:00 AM

Hello, I’m curious, when you say XW do you mean the Lunt APM XWA 20mm? I’m trying to decide between the two, for my Obsession 15” Dob. Did you find the Ethos 21” gave nicer views and outperformed the XW 20” in the end? There’s a huge 2-3x difference in price between the ethos and XW. Thanks

XW is referring to the Pentax XW 98% of the time. In regards to the APM 20mm, it is a half pound lighter [23.9 oz] than the 21mm Ethos [36 oz]. I have not tried the APM, but a lot of users say it's on par [maybe a couple strokes behind] with the Ethos and better than the ES 20/100°.



#42 Roragi

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Posted 20 September 2019 - 01:09 PM

Sorry, I'm lost.  Are you referring to the 21 Ethos in the subject of the thread?

Yup, the initiator of the post wanted feedback, because this is where I say that the E21 is much higher as an example the N31.



#43 Spartinix

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Posted 21 September 2019 - 12:44 PM

Some have reported that positioning of the eye is a bit finicky with the TVE21. For me this is also the case. I feel like I'm missing out on the outer 5 degrees of the apparent field if my eye is in the right position. But I'm not sure yet if it's a big enough deal for me to buy an equivalent different brand ep to compare to. There's a bit of a trade off regarding viewing comfort and optical excellence sometimes, so be it.
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#44 areyoukiddingme

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Posted 21 September 2019 - 03:55 PM

Some have reported that positioning of the eye is a bit finicky with the TVE21. For me this is also the case. I feel like I'm missing out on the outer 5 degrees of the apparent field if my eye is in the right position. But I'm not sure yet if it's a big enough deal for me to buy an equivalent different brand ep to compare to. There's a bit of a trade off regarding viewing comfort and optical excellence sometimes, so be it.

If you haven't already, try viewing with the eye cup removed. You may find the full field a little easier to take in.



#45 GeneT

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Posted 21 September 2019 - 07:01 PM

The 21 Ethos is my second favorite eyepiece--only topped by the 13.


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#46 scotsman328i

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Posted 21 September 2019 - 09:14 PM

The 21 Ethos is my second favorite eyepiece--only topped by the 13.

I agree 100% owned the 17, 13 and 8 Ethos at one time, just the 13 Ethos remains...love that eyepiece!


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#47 George9

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Posted 21 September 2019 - 09:37 PM

I held off buying the 21mm Ethos for a while because I had the 31mm Nagler. A friend let me use it all night at Black Forest SP, and that did it. So now the 31 rarely comes out. I can see the full field of view in my glasses. My metal frames used to be easier to lean in, but even my plastic frames let me get in there. I recommend it.

 

I did try the 17mm ES92 but I found the extra wide top very uncomfortable, so much so that I only just made the field stop with my glasses on, and that was to get to 92 deg. So I passed. A lot of positive feedback on CN, though, so I will have to try again someday.

 

So far only the 17mm Nagler4 truly lets me see the full field completely relaxed with my glasses, but that's only 82 degrees. If I limit myself to 82 degrees, I bet I can see that much in the Ethos and in ES92 very comfortably, too.

 

George



#48 George9

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Posted 21 September 2019 - 10:15 PM

A little more on the above comments, as I just retested the 31N5, 21E, and 17N4. Indeed if I aim for 82 degrees (measured by simply putting a Nagler in the other eye), then my glasses don't need to touch the rubber eyeguard on the Ethos. But to get to 100 degrees, I do have to lean a little. I can get to 100 degrees easily if I look straight ahead. If I try to see the edge (turn my eye toward the edge), then I see less of the AFOV.

 

Without glasses (strong myopia), the AFOV of the Ethos is astounding. With glasses, the strong negative element renders the AFOV smaller. Feels more like 90 or 80 degrees with glasses on.

 

I remember the ES92 now. If you have a somewhat narrow IPD (not ridiculously narrow, just somewhat), then the side of the top of the eyepiece hits your nose. You adjust by pulling the eyepiece outward. Without glasses you just peer in the side a bit. If you wear glasses, that means you end up having your glasses block further out, like 5mm (because the eyepiece is now tilted away from your nose). So I ended up losing the benefit of the extra eye relief.

 

The 31 Nagler is very wide in the middle, but the very top is not so wide, and I can look straight into it, like the Ethos.

 

George


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