Most Read Articles
Moon Phase
CURRENT MOON Waxing Crescent
The Sun Now
Time Zones
8:25 am
5:25 am
10:25 am
New York
4:25 pm
10:25 pm
9:25 pm

Go Back   IceInSpace > Equipment > Eyepieces, Barlows and Filters

Thread Tools Rate Thread
Old 05-05-2018, 07:51 PM
ab1963's Avatar
ab1963 (Andrew)
Registered User

ab1963 is online now
Join Date: Jan 2015
Location: sydney
Posts: 254
Explore Scientific 20mm 100 deg

I have had the Ethos 21mm and now have the above mentioned ,Could not get accustomed to the Ethos and proved to be a very expensive disappointment ,bought the ES on iis to give it a go and love it ,Sharp edge to edge and most notably the contrast of stars .
I just wanted to find out if anyone has had the same experience as i have ,Read many reviews on both eyepieces and basically think those who think the Ethos is superior must be on something exotic or are most of the reviews you see just people talking out of their neck ,Any feedback would be appreciated.......
Reply With Quote
Old 06-05-2018, 08:58 AM
Registered User

GUS.K is offline
Join Date: Jun 2014
Location: Katoomba,NSW
Posts: 291
What was the issue with the 21 ethos, I have one and donít have any trouble using it any of my scopes.
Reply With Quote
Old 06-05-2018, 09:43 AM
ab1963's Avatar
ab1963 (Andrew)
Registered User

ab1963 is online now
Join Date: Jan 2015
Location: sydney
Posts: 254
I suppose it's down to the one mans meat thing,I've found the contrast better especially in the colors of stars in the ES ,As sharp and a lot easier to look through with similar ER,The question that i asked was of anyone who has viewed through both and what their findings are as it was a shock to me ,Just took a punt on the ES and happy i did.....
Reply With Quote
Old 07-05-2018, 07:24 PM
Wavytone (Nick)

Wavytone is offline
Join Date: Jul 2008
Location: Killara, Sydney
Posts: 3,355
I've looked through Ethos' on several occasions, mainly on other peoples scopes... not terribly impressed.

IMHO these ultra-extreme wides are like a party trick, amusing at first, but not optimal in 2 or 3 respects.
Reply With Quote
Old 08-05-2018, 09:53 AM
SkyWatch (Dean)
Registered User

SkyWatch is offline
Join Date: Jan 2013
Location: Adelaide
Posts: 357
Hi Andrew,

I've looked through both in a range of telescopes, from my f8 refactor to an f4 18" reflector. Both did the job happily in that both were quite sharp to the edge, gave a nice contrasty field and were relatively easy to look through. I found it hard to separate them, although the Ethos might have had a slight edge in edge-of-field sharpness in the f4 scope. I don't remember any contrast/colour difference like you suggest as I was mainly concentrating on field sharpness at the time (and I didn't want to hog someone else's scope or eyepiece too much!), but I came away more than happy with my "cheap" ES vs the Ethos. It performs very well even in my 12" f5 scope without a coma corrector.

(In response to Wavytone's comment, I must admit though I am not a huge fan of the ultra-wide fields. The 20mm ES 100 is the only one I will ever have. If I have to turn my head to see the edge of the field I feel that for me they are simply too wide. In fact at one stage I acquired a 13mm Ethos and sold it in favour of my 13mm Nagler. The smaller eyepiece is a lot easier to balance in my 12" scope too!)

All the best,


Last edited by SkyWatch; 08-05-2018 at 01:55 PM.
Reply With Quote
Old 08-05-2018, 07:33 PM
ab1963's Avatar
ab1963 (Andrew)
Registered User

ab1963 is online now
Join Date: Jan 2015
Location: sydney
Posts: 254
Hi Dean and thanks for the feedback,Very happy with 20mm there was something that just didnít feel right with the 21mm Ethos for me that is and when I first looked through the ES it just felt right and enjoyed it ever since .
Reply With Quote
Old 18-05-2018, 09:25 PM
yoda776 (Matt)
Registered User

yoda776 is offline
Join Date: Oct 2014
Location: Adelaide, South Australia
Posts: 211
Thanks for the thread i was wondering about the difference i these two eyepieces myself. The 21mm is just far too expensive. I do prefer my naglers and looking forward to clear skies so i can try the 20mm nagler type 5 i grabbed not long ago. I do have an ethos 13mm and had the 17mm burr sold it as i found kk was not using it like i did the naglers. Just smaller and lighter. The ethos 3.7 110 degree eyepiece has limited use as well and requires really steady viewing conditions.

Thanks again. This thread helped answer a few questions i had about the two eps.
Reply With Quote
Old 26-05-2018, 05:35 AM
Don Pensack's Avatar
Don Pensack
Registered User

Don Pensack is offline
Join Date: Aug 2006
Location: Los Angeles
Posts: 358
My own experience was the reverse, with the 20mm ES displaying a fair amount of outer field astigmatism. This is in an f/5 scope with a Paracorr coma corrector, so a very flat field with no coma.
That being said, it's a bargain, price-wise, especially now with the sale price.
Reply With Quote


Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT +10. The time is now 07:25 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
OzScopes Authorised Dealer
Interest Free Finance
SkyWatcher 2018 Catalogue
SkyWatcher WiFi Adaptor
Atik Horizon
NexDome Observatories
FLI Cameras and Imaging Accessories
Lunatico Astronomical
Astronomy and Electronics Centre