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Explore Scientific 9mm 120° - thoughts ?

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57 replies to this topic

#26 Luca Brasi

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Posted 20 April 2019 - 12:01 AM

Tried both the flashlight and star timing tests. I didn't have much luck with the flashlight, my margin of error was off by 10 degrees.

The star test was spot on though. I'm a math guy, so the hardest part was pushing the stop watch button! My ES 14mm appeared to be 102°, and my 20mm was an even 100°... But the 9mm registered 142°!?!

I triple checked my math and used the same star for every eyepiece. The FOV seems correct... so could the distortion at the edge of field throw off my timing, or maybe it's a 9.5mm, or maybe the AFOV really is more than 120°???
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#27 Procyon

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Posted 20 April 2019 - 12:12 AM

Any serial no.? Bought from whom at Neaf? smiley-char145.gif

 

You have a 140 :)


Edited by Procyon, 20 April 2019 - 12:13 AM.


#28 Luca Brasi

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Posted 20 April 2019 - 04:16 PM

I'm still skeptical, but the field of view is pretty insane, plus a maxed out field would also explain why my coma corrector cuts into my AFOV a bit and the edge is soft from vignetting. I don't really mind the color and softness at the edge of field since the edges are just barely within my peripheral vision.

I got it from the High Point Scientific NEAF sale. It was marked way down since the ES sale was going on at the same time.

SN# 120900070

Edited by Luca Brasi, 20 April 2019 - 04:32 PM.


#29 vkhastro1

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Posted 20 April 2019 - 04:24 PM

From previous ES 9mm 120° CN postings, the first release with the AFOV of 140° was SN 1 to 20.

After that, a field stop was then utilized to reduce the AFOV to 120°.

Based on your SN of 00070, yours would be the AFOV of 120°.



#30 obrazell

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Posted 21 April 2019 - 03:38 AM

I must admit I have never understood the fascination with this eyepiece. I did buy one and found that the contrast and sharpness was poor compared to a TV Ethos  10 and 8mm. It was just grey. We tried it on a number of scopes and with a number of experienced observers and nobody liked it. If it was not for the fact that the 2nd hand market in the UK is very poor I would have offloaded it long ago. I wonder if some of the justifications are due to the fact that people paid a lot of money for theirs and are now trying to justify it to themselves. My serial number is 123 so it is definitely one of the 120 not 140 ones. Put me off ever buying another ES eyepiece again.


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#31 faackanders2

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Posted 22 April 2019 - 09:52 PM

From previous ES 9mm 120° CN postings, the first release with the AFOV of 140° was SN 1 to 20.

After that, a field stop was then utilized to reduce the AFOV to 120°.

Based on your SN of 00070, yours would be the AFOV of 120°.

Still waiting on one cloudy night member to determine if there ever was a FOV design change between SN 1-20 and higher SN with a blind test.  ES never mentioned any design change, so I speculate it most likely is a myth.



#32 Dunkstar

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Posted 22 April 2019 - 10:27 PM

I’ve had one of these since not long after they were released.

 

It may not be an Ethos - certainly doesn’t have that printed on the side, last time I checked - and I’ve had a couple of those and they were excellent, but the 9mm 120 is a very good eyepiece.

 

I’ve used it with my C11 on planets and it’s not impossible to see a small amount of light/contrast loss compared to a less glassy eyepiece. My nearest comparison was with a BCO 10mm. But VERY different experience. And a hint of questionable seeing would even it out on that scope.

 

But I can certainly understand the intrigue, and it’s a crowd pleaser at every star party I’ve taken it to, so it’s seen scopes of all shapes and sizes. Maybe isn’t for everyone...but if you’re curious, it might be worth trying. I’m happy that I bought it back when, myself and countless others have had a lot of enjoyment from it. (Whether or not they were honest is on them)



#33 25585

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Posted 23 April 2019 - 08:13 AM

I must admit I have never understood the fascination with this eyepiece. I did buy one and found that the contrast and sharpness was poor compared to a TV Ethos  10 and 8mm. It was just grey. We tried it on a number of scopes and with a number of experienced observers and nobody liked it. If it was not for the fact that the 2nd hand market in the UK is very poor I would have offloaded it long ago. I wonder if some of the justifications are due to the fact that people paid a lot of money for theirs and are now trying to justify it to themselves. My serial number is 123 so it is definitely one of the 120 not 140 ones. Put me off ever buying another ES eyepiece again.

The ES92s are superb. They are the best 2 ES eyepieces, maybe ever. If you manage to sell your 9mm, give the 12mm 92 a try. 


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#34 rowdy388

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Posted 23 April 2019 - 11:53 AM

Still waiting on one cloudy night member to determine if there ever was a FOV design change between SN 1-20 and higher SN with a blind test.  ES never mentioned any design change, so I speculate it most likely is a myth.

I've got one of the refurbished 120's from Telescope Warehouse. I'm skeptical too. We prove everyday that

we can't all agree on identical eyepieces. We all just see things differently and this being such a unique 

experience, opinions will likely be widely varied. I'm just going to have fun with mine. I also have the 8 & 10

Ethos. Time will tell which ones get the most use. I find critically comparing good eyepieces tedious. I can

see the differences between them alright, but I'm weird in that I like some of my eyepieces to be different.

Astigmatism, coma, and field curvature are the only aberrations that really bother me. My tolerance for most

other forms is rather high.


Edited by rowdy388, 23 April 2019 - 11:55 AM.

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#35 junomike

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Posted 24 April 2019 - 08:48 AM

Tried the ES 9 120 a few nights ago for the first time.  Result is I like it and I don't.

For targets that easily fit into the FOV  = waytogo.gif

For targets that required the whole FOV (or close to it) I preferred the ES 12mm 92.

I don't think this would replace any eyepieces, but sure does compliment them.


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#36 Luca Brasi

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Posted 24 April 2019 - 10:19 PM

I totally agree with your assessment Mike...

 

After comparing the 9mm 100 to the 120 I really couldn't determine which gave the better view.  It was just different.  The Pinwheel (M101) showed better detail in the 120 and the Whirlpool (M51) was sharper in the 100...  and I must say that Markarian' Chain was amazing in the 120.

 

I still wonder if it is truly a 9mm though.  Maybe it's the large AFOV, but the magnification of the 120 seems lower than the 100.  It would also explain the 140 degree AFOV calculations I found and all the rumors.

 

Either way, great eyepiece...  Just a little odd.



#37 Tank

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Posted 25 April 2019 - 11:59 AM

Had a few night under my belt with the 9ES120

What i can say

very immersive

sharp

doesnt seem like your looking thru a million elements

I would like it to have a bit more ER

however feels very quality image like other high end EPs

I cant say there is a better 9mm out there for DSO

I get the feeling its going to be awesome for extended nebula in my 16" bow.gif

can wait to use more


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#38 PPPPPP42

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Posted 19 May 2019 - 08:33 AM

So I will drag this discussion back to the top since it’s relevant to me at the moment. 

For you people that have used both the ES 9mm 100 and the 120 is the 120 worth the extra?

I will be getting one or the other and if the 100 is better across the whole image and the 120 is noticeable less good near the edges (which I understand that it is for reasons of color apparently) then the extra 20 degrees wouldn’t interest me. But if they are both of the same quality at the same distances from center to edge than I would want the 120.

it is a huge price jump between the two.  The 120 is on sale right now and the 100 isn’t so I will wait if I want the 100.



#39 faackanders2

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Posted 19 May 2019 - 08:37 AM

So I will drag this discussion back to the top since it’s relevant to me at the moment. 

For you people that have used both the ES 9mm 100 and the 120 is the 120 worth the extra?

I will be getting one or the other and if the 100 is better across the whole image and the 120 is noticeable less good near the edges (which I understand that it is for reasons of color apparently) then the extra 20 degrees wouldn’t interest me. But if they are both of the same quality at the same distances from center to edge than I would want the 120.

it is a huge price jump between the two.  The 120 is on sale right now and the 100 isn’t so I will wait if I want the 100.

The 120 AFOV has a brown ring of fire on the bright Moon



#40 PPPPPP42

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Posted 19 May 2019 - 05:04 PM

Does the 100 or is it good edge to edge?



#41 Luca Brasi

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Posted 19 May 2019 - 08:20 PM

I wouldn't say the 120° is worth the extra price tag versus the 100°.  But it is noticably more immersive.  Side by side they are optically equal.  Switching between the 100° and 120° feels a lot like switching between an 100° and an 82°.

 

The major difference is the eyecup.  For some reason Explore Scientific threw a useless eyecup on the 120°. The eye placement  can be difficult to hold on both versions of the 9mm if the eyecup is folded down.  But the eyecup on the 100° is the perfect length.  I needed to trim half the eyecup off of the 120°, but now it works perfectly.

 

I am currently selling my 9mm 100° simply because once you look through 120°, you can never go back!


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#42 Tank

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Posted 19 May 2019 - 10:09 PM

Im liking my 9es120

had the 9ES100

120 Is just alot more and unique

liking the 120 alot more than the 100


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#43 Roragi

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Posted 20 May 2019 - 09:05 AM

Once I was asked to do an observation of a few minutes, if the field is very large but not something barbarous compared to my ethos 8, from my point of view the great price and the weight that adds to the whole scope, does not deserve the sorrow.

 

Roberto.



#44 PPPPPP42

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Posted 20 May 2019 - 08:56 PM

With all these positive first hand reviews, especially the 100 vs 120 comments I am pretty well sold on the 120 now.

I had a chance on a used 9mm & 14mm 100 degree combo but I decided to just go for the 120 while it’s on sale since it sorta covers both those well enough for me and I love wide angle, love high magnification and hate changing eyepieces so this thing seems to be made for me. Thanks all.

 

Edit: Did I seriously just spend $719 on a single eyepiece? I remember when I stretched my budget to buy my original 6se used for $450. What the hell is wrong with the lot of us.

At least I don’t regret it in the slightest, now I can say I own the holy hand grenade of astronomy.


Edited by PPPPPP42, 20 May 2019 - 10:40 PM.

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#45 Sarkikos

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Posted 21 May 2019 - 06:06 AM

The 9mm 120 is one of those eyepieces which once acquired, you should not relinquish.

 

Mike


Edited by Sarkikos, 21 May 2019 - 06:08 AM.


#46 Sarkikos

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Posted 21 May 2019 - 06:10 AM

Edit: Did I seriously just spend $719 on a single eyepiece? I remember when I stretched my budget to buy my original 6se used for $450. What the hell is wrong with the lot of us.

Don't feel too bad.  I just spent $698 on a 51mm refractor.  shrug.gif

 

grin.gif

Mike


Edited by Sarkikos, 21 May 2019 - 06:15 AM.


#47 jag767

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Posted 05 September 2019 - 01:11 PM

Just picked up sn 121 in the classifieds, man this thing is big! And i have some big eps and i still was blown away. No idea when I'll get a clear night but I'm eager to get to use it.
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#48 rowdy388

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Posted 05 September 2019 - 04:41 PM

Just picked up sn 121 in the classifieds, man this thing is big! And i have some big eps and i still was blown away. No idea when I'll get a clear night but I'm eager to get to use it.

I was shocked that it was heavier than my ES92 17mm. I had to add a little extra counter balance to my

12.5" scope.



#49 noisejammer

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Posted 05 September 2019 - 08:40 PM

It's very much an experience to use...

 

I was at Starfest a couple of weeks back. One gent was plying his trade measuring eyepiece fields of view. Let's say some manufacturers should improve their measurements...

 

... but the 9/120 is peerless. Given that I can't actually see the field stop, some might suggest it's also pointless. And I love it! :lol:



#50 Miranda2525

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Posted 06 September 2019 - 12:56 AM

Let's just say it's not for everyone.

 

I looked though one at a star party, and I didn't take a liking to it at all.




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