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5mm Ethos

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#1 Lt 26

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Posted 13 August 2016 - 02:41 PM

I so wish TV would have made a 5mm Ethos that was a match to the 6 and 8 Ethos. Meanig 100° same size shape and weight. Even the 4.7 Ethos would be ok if it were the same specification as the 6 and 8.

 

I would own one for sure but will never get either of their 110° eyepieces.

 

Dereck



#2 mgwhittle

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Posted 13 August 2016 - 03:19 PM

I'd recommend looking through one before deciding on size and weight. You might find the views worth it.   :)



#3 areyoukiddingme

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Posted 13 August 2016 - 03:36 PM

After having acquired the 6 and 8, I have to agree. The smaller form and more accessible field make those focal lengths more engaging than the 110 degree fields which can feel a little irksome. 

 

I see the 3.7 and 4.7 as being of best use in a non-tracking dob where you need high power and to maximize drift time, as well as ease object location.



#4 AZStarGuy

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Posted 13 August 2016 - 03:56 PM

After owning both 3.7 & 4.7 and using them in a variety of scopes, I wouldn't part with them.  Ruling them out without trying is selling yourself short.  They flat out deliver the goods.  



#5 csrlice12

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Posted 13 August 2016 - 04:00 PM

The 4.7 on M13 in my dob is really nice.



#6 havasman

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Posted 13 August 2016 - 04:29 PM

The 4.7SX is my shortest focal length Ethos and it's an awfully nice fit just below the TVE6 in both the Starmaster and refractor. It's ergonomics are the best of any of the 1.25/2" Ethos, IMO, as it doesn't have that silly partial skirt/screw mechanism and doesn't require a 2" extension to be relatively parfocal with the rest at the H setting on a P2. I wish they'd built the 6 like the 4.7!  :lol: 

 

I like the superwide fields and this one delivers splendidly. Fine optics, for sure.

 

But if you don't like 'em, s'ok w/me. There's always a 5T6 for a very high performance option in a compact package.



#7 Starman1

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Posted 13 August 2016 - 05:29 PM

I so wish TV would have made a 5mm Ethos that was a match to the 6 and 8 Ethos. Meanig 100° same size shape and weight. Even the 4.7 Ethos would be ok if it were the same specification as the 6 and 8.

 

I would own one for sure but will never get either of their 110° eyepieces.

 

Dereck

I recently compared the 4.7mm Ethos SX, the 5mm Delite, and the 5mm T6 Nagler in my 12.5" (with Paracorr) on Saturn and Mars.

Some comments:

Sharpness on axis--4.7 Ethos SX was sharpest.

Sharpness halfway to edge of field--4.7mm Ethos SX was the winner

Sharpness at the edge of the field (just in from it)--4.7mm Ethos SX was the winner.

Stuck a Baader Contrast Booster filter on the Paracorr and compared views of Mars:  sharpest with most details seen--4.7mm Ethos SX.

None of the 3 had noticeable astigmatism at the edge.

None of the 3 had serious light scatter, though all 3 showed a trace of scatter in the immediate vicinity of the planetary disc.

All 3 showed 6 moons of Saturn (thanks to my phone program which identifies where each moon is)but they were easiest in the Ethos SX (probably due to having a magnification 23x higher).

The 7th visible moon was hiding.

I don't care about the 110° field because I typically let it drift from 75% on one side of center to 75% on the other when viewing, giving me 50 seconds between nudges of the scope.

But I'd miss the sharpness and field size.  It's allowed me to see 5 moons at Uranus, too.

I use it as a 2" with the adapter on it.


Edited by Starman1, 13 August 2016 - 05:30 PM.


#8 junomike

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Posted 13 August 2016 - 05:42 PM

I also wanted this F/L for the odd time in my fast scopes.  My solution is the 10mm Ethos + Meade 2X 2" TeleXtender.  Proabblty not as good as a 5mm Ethos (or 4.7mm SX) but good enough for me and the infrequent times I need it.  The 21mm Ethos + 4X Powermate would also get you close enough IMO.

 

Mike



#9 JimP

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Posted 13 August 2016 - 05:45 PM

My 4.7 Ethos is on the way. I am getting it for use in my Tak TSA 120 on a DM4. I am looking for the magnification and the field for drift. I wouldn't necessarily want the 110* if I were using one of my scopes with an equatorial mount. I have never really done a lot of serious observing using an Alt/Az mount and I want to give it a good try and I believe the 110* field will help. I do expect just as Don does, I will do my observing from 75% on one side to 75% on the other.



#10 Lt 26

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Posted 13 August 2016 - 06:02 PM

Just sold a 5mm T6 because I just couldn't get comfortable with it. Can not find anything I like in the 5mm range.

The Pentax 5xw may cause me to look elsewhere. 

 

Dereck



#11 Sarkikos

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Posted 14 August 2016 - 09:29 AM

After having acquired the 6 and 8, I have to agree. The smaller form and more accessible field make those focal lengths more engaging than the 110 degree fields which can feel a little irksome. 

 

I see the 3.7 and 4.7 as being of best use in a non-tracking dob where you need high power and to maximize drift time, as well as ease object location.

 

I agree with the second sentence but not the first.

 

:grin:

Mike



#12 Sarkikos

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Posted 14 August 2016 - 09:33 AM

I am waiting for TeleVue to introduce the 2.7mm Ethos-SX 110 degree!  :waytogo:

 

Mike



#13 Sard

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Posted 14 August 2016 - 10:52 AM

My 4.7 Ethos is on the way. I am getting it for use in my Tak TSA 120 on a DM4. I am looking for the magnification and the field for drift. I wouldn't necessarily want the 110* if I were using one of my scopes with an equatorial mount. I have never really done a lot of serious observing using an Alt/Az mount and I want to give it a good try and I believe the 110* field will help. I do expect just as Don does, I will do my observing from 75% on one side to 75% on the other.

That should be a great combo.  I have a 120/900 refractor as well and I think you will appreciate the extra FoV for finding and tracking objects.  That's a lot of magnification to track on an alt/az, but if any mount can provide the smooth motion needed, its a Discmount.  I'm sure the optics on your Tak are a step above my Skywatcher 120 ED, but unless I'm observing from a dark site, my 5.5mm Meade is about the most magnification I find pleasing.  Hopefully you are not frustrated that the seeing doesn't support the 190x that the Ethos will provide.



#14 JimP

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Posted 14 August 2016 - 01:01 PM

Yes I understand. But, as I want to use my 120 for double stars it may be fine with the high magnification. Doubles often, in my experience, allow high magnification without image breakdown. We will see! LOL

#15 RAKing

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Posted 15 August 2016 - 09:26 AM

Yes I understand. But, as I want to use my 120 for double stars it may be fine with the high magnification. Doubles often, in my experience, allow high magnification without image breakdown. We will see! LOL

 

Agreed!  I can usually go with higher magnification to split a tight double then if I am trying to see details on a planet.

 

Having said that, my favorite 5mm Ethos is the 10mm Ethos with a TV 2x Powermate. :lol:

 

Cheers,

 

Ron



#16 faackanders2

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Posted 17 August 2016 - 09:18 PM

I am waiting for TeleVue to introduce the 2.7mm Ethos-SX 110 degree!  :waytogo:

 

Mike

 

Use a telecentric barlow for those rare calm nights.


Edited by faackanders2, 17 August 2016 - 09:19 PM.


#17 Shneor

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Posted 18 August 2016 - 01:31 AM

 

I am waiting for TeleVue to introduce the 2.7mm Ethos-SX 110 degree!  :waytogo:

 

Mike

 

Use a telecentric barlow for those rare calm nights.

 

Too much glass, eye too far from focuser.

 

Shneor



#18 John F

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Posted 18 August 2016 - 03:23 AM

RAKing, on 15 Aug 2016 - 07:26 AM, said:

 

My favorite 5mm Ethos is the 10mm Ethos with a TV 2x Powermate. :lol:

 

Cheers,

 

Ron

 

I used to have a TV 2.00-Inch 2x Powermate and agree with you that it works very well with the 10mm Ethos to give you in effect a 5mm Ethos.  It also works just as well with 8mm Ethos giving you the equivalent of a 4mm Ethos and with the 6mm Ethos giving you the equivalent of a 3mm Ethos.  Another way to get a 5mm Ethos is to use a Nikon 1.6x EIC barlow with an 8mm Ethos and that combination also works very well.

 

As for the SX versions having a 110-degree AFOV versus a 100-degree size of the original Ethos eyepieces, I also prefer the 100-degree size for observing purposes and if it were possible to make a 4.7mm and 3.7mm Ethos eyepiece with a 100-degree AFOV and if those eyepieces were about the same size and weight (or a little less) than the 8mm and 6mm Ethos eyepieces, then I'd prefer that to the two current SX versions which are significantly taller in height.  They're so tall in fact that I can't fit them into my eyepiece case (if in an upright position) and that became a deal breaker for me with respect to those two Ethos SX eyepieces.  However, when Tele Vue later brought out their 4.5mm and 3.5mm Delos eyepieces I decided to give those a try I've been very pleased with those.  I mostly use them on the moon, the planets and for splitting double-stars and for those applications I don't need to use eyepieces that have 100 or 110-degree apparent fields.

 

John Finnan


Edited by John F, 18 August 2016 - 03:25 AM.


#19 faackanders2

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Posted 18 August 2016 - 08:26 PM

 

 

I am waiting for TeleVue to introduce the 2.7mm Ethos-SX 110 degree!  :waytogo:

 

Mike

 

Use a telecentric barlow for those rare calm nights.

 

Too much glass, eye too far from focuser.

 

Shneor

 

You may be waiting a very long time.



#20 Sarkikos

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Posted 18 August 2016 - 09:44 PM

Televue still sells a 2.5 T6 Nagler.  Why not a 2.7 Ethos-SX?  

 

I wouldn't be surprised to see that happen.  TeleVue has been phasing out some of the Naglers over the years while introducing more Ethos and other lines.  

 

Mike



#21 NC Startrekker

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Posted 19 August 2016 - 07:34 PM

... They're so tall in fact that I can't fit them into my eyepiece case (if in an upright position) and that became a deal breaker for me with respect to those two Ethos SX eyepieces.  However, when Tele Vue later brought out their 4.5mm and 3.5mm Delos eyepieces I decided to give those a try I've been very pleased with those.  I mostly use them on the moon, the planets and for splitting double-stars and for those applications I don't need to use eyepieces that have 100 or 110-degree apparent fields.

 

John Finnan

 

 

John, I also decided to forgo the two Ethos SX eyepieces. Like you, I went with the same two Delos and use them in a similar fashion. Where I want 100 degrees, I use my 10, 8 and 6 Ethos with my 2x Powermate. Optically this works very well. Only consideration is the added weight and height the Powermate adds to the equation. Alan



#22 Sarkikos

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Posted 19 August 2016 - 11:44 PM

I have no problem fitting the 3.7 and 4.7 Ethos-SX vertically in my Pelican 1550 case.

 

Mike



#23 CAAD9

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Posted 22 August 2016 - 06:20 PM

It's allowed me to see 5 moons at Uranus, too.

 

 

 

 

When I read that my jaw just dropped! You can see moons at Uranus?  Wow!

 

maybe I'm just too much of a newb and easily impressed, but I'm really impressed.  And inspired.  I have a 14" dob, cheap one to be sure, but still I have to give the moons of Uranus a go!

 

thanks Don



#24 Starman1

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Posted 22 August 2016 - 07:54 PM

Titania--m.13.0

Oberon--m.13.2

Ariel--m.13.2

Umbriel--m.14.0

Miranda--m.15.3

All within reach of your scope at high power in good seeing.

 

http://www.skyandtel...moons-ofuranus/

is a small app to show you real-time moon locations.  Remember to compensate for the tilt of the field.

Launch the applet from the text link to the right of the applet picture.


Edited by Starman1, 22 August 2016 - 07:57 PM.


#25 John Huntley

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Posted 23 August 2016 - 08:04 PM

I've managed Titania and Oberon from here in the UK with my 12" Orion Optics dob. I recall that 300x - 400x was needed to achieve that from my backyard. The Ethos 4.7 and 3.7. were my "tools of choice" for that task.

 

At a darker site then I'll have a crack at the other 3 that Don lists :)


Edited by John Huntley, 23 August 2016 - 08:05 PM.



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