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Equipment Discussions >> Eyepieces

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astro_baby
scholastic sledgehammer


Reged: 06/17/08

Loc: United Kingdom
Re: is anyone planning on buying the ES100 30mm? new [Re: hfjacinto]
      #5729650 - 03/13/13 03:30 AM

Definitely NOT in the market for this......BUT I think it will find a home. 20 years ago no one would have believed a $500 100' would dind a home. Back a bit no one had a 2" focuser.

Once the EP is here I would bet it finds buyers and they will prompt other manufacturers to make scopes that will work with it. Just the same as years ago no one made F5 newts with 2" focusers.

For E is peobably more of a Formula 1 product, it gives them credibility to say "we are advanced, we are cool, we have the biggest and best etc etc' its pebably worth the development cash just to be able to put it on the shelf even if they never sold a single one.


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Illinois
Carpal Tunnel


Reged: 12/18/06

Loc: near Dixon, Illinois USA
Re: is anyone planning on buying the ES100 30mm? new [Re: astro_baby]
      #5729828 - 03/13/13 08:09 AM

Not me! I would buy 30mm 82 degree! ES100 30mm is 7 lbs is almost as heavy as my refractor! Diffcult for simple mount for balancing unless you stuck with just one eyepiece ES100 30mm! I perfer to use 3 eyepieces for the night!

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Jim Romanski
Carpal Tunnel
*****

Reged: 01/02/05

Loc: Guilford, Connecticut
Re: is anyone planning on buying the ES100 30mm? new [Re: hfjacinto]
      #5730528 - 03/13/13 03:11 PM

Quote:

If I had a scope that could make use if this eyepiece, I would get it. I already want the 9MM 120* one.



A Ha! I knew all that astrophotography stuff couldn't keep you away from eyepieces forever Helder.

I would be interested in one as well. I'm hoping the have the prototype at NEAF in April.


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gatorengineer
Carpal Tunnel
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Reged: 02/28/05

Loc: Hellertown, PA
Re: is anyone planning on buying the ES100 30mm? new [Re: Jim Romanski]
      #5730808 - 03/13/13 06:05 PM

I am inline for one. Over twice the field of a 31 Nagler Will give me about a degree in a 25 F5....... Its not cheap, Neither is the 3" feathertouch but you only go around once.... Part of the rationalization if there could ever be one is it gets me the field bang of the small fast scopes at 10% of the cost (that is until a 3" paracorr comes out).... do the calcs with a starmaster F3.7 and paracorr with a 31 nagler (and I still get to keep the ladder).... Big Dobs F4.5 and slower is the only place this thing makes sense.

Edited by gatorengineer (03/14/13 07:51 AM)


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faackanders2
Carpal Tunnel


Reged: 03/28/11

Re: is anyone planning on buying the ES100 30mm? new [Re: pbsastro]
      #5731467 - 03/14/13 12:37 AM

If you plan to get a 24" f3 why wouldn't you want a 3" focuser and secondary to accomodate the ES100 30mm (you would get for your other scope)? It might save you from having to transport so many scopes.

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faackanders2
Carpal Tunnel


Reged: 03/28/11

Re: is anyone planning on buying the ES100 30mm? new [Re: astro_baby]
      #5731469 - 03/14/13 12:39 AM

Quote:

Definitely NOT in the market for this......BUT I think it will find a home. 20 years ago no one would have believed a $500 100' would dind a home. Back a bit no one had a 2" focuser.

Once the EP is here I would bet it finds buyers and they will prompt other manufacturers to make scopes that will work with it. Just the same as years ago no one made F5 newts with 2" focusers.

For E is peobably more of a Formula 1 product, it gives them credibility to say "we are advanced, we are cool, we have the biggest and best etc etc' its pebably worth the development cash just to be able to put it on the shelf even if they never sold a single one.




If they build it, they will come ...


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Scanning4Comets
Markus
*****

Reged: 12/26/04

Re: is anyone planning on buying the ES100 30mm? new [Re: faackanders2]
      #5731483 - 03/14/13 12:53 AM

Quote:

If they build it, they will come ...




...Not for everybody.


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Sean Puett
Carpal Tunnel
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Reged: 09/06/10

Loc: always cloudy, washington
Re: is anyone planning on buying the ES100 30mm? new [Re: faackanders2]
      #5731779 - 03/14/13 08:41 AM

Quote:

If you plan to get a 24" f3 why wouldn't you want a 3" focuser and secondary to accomodate the ES100 30mm (you would get for your other scope)? It might save you from having to transport so many scopes.




The reason that I (and I believe most people) would not want this eyepiece in a dob is because you would need to increase the size of your secondary to have decent illumination at the 75% to the field stop. What good is the extra fov if if dims noticeably? How much larger a secondary are you willing to tolerate? Is it worth it? All these are questions that need an answer before even considering this eyepiece.

For the refractor, my scope's balance changed quite a bit just from adding the feathertouch upgrade to the existing Televue focuser. Trying to go from a 1.5lb eyepiece to a 7lb eyepiece would require sliding the scope in its rings. I would have a 5.5* tfov though.

I love the concept of this eyepiece. I don't want anyone thinking I am bashing ES in any way. I am not. I think this eyepiece would be great in Rob's 10"f15 refractor. Rob is a local CNer with an observatory who would probably not want this eyepiece because he likes simple eyepiece designs better but, it doesn't stop me from fantasizing about that giant refractor with this eyepiece.
If you have a newt and want to get this eyepiece, running the numbers through the NEWT program should answer a lot of questions about illumination and secondary size. I may try that with my Z12 later just to see what it looks like. Some of the big super fast dob have giant secondaries already and may be able to use this eyepiece with just a larger focuser.


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Sean Puett
Carpal Tunnel
*****

Reged: 09/06/10

Loc: always cloudy, washington
Re: is anyone planning on buying the ES100 30mm? new [Re: Sean Puett]
      #5731945 - 03/14/13 10:19 AM

After running my Z12 through NEWT, I think it could illuminate this eyepiece well without a larger secondary. Some of the premium scope's with smaller secondaries optimized for contrast might need to increase the size though. The 30mm ES100 costs twice what I paid for that telescope though...

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gatorengineer
Carpal Tunnel
*****

Reged: 02/28/05

Loc: Hellertown, PA
Re: is anyone planning on buying the ES100 30mm? new [Re: Sean Puett]
      #5731997 - 03/14/13 10:48 AM

Realize that exit pupil above 7mm is wasted, so below F4.5 (after paracorr), this does not make sense. F4 and below for me without coma correction is entirely unuseable anyway, if I want to see seagulls I go to the beach. There are no visual 3" comma correctors out there yet. So using this on a dob faster than 4.5 is not economically justified as there are other options out there the 25 100 or the 31 82 degree....

On a long F ratio refractor, why not use a giant plossl as a finder EP? long refractors are purpose built scopes and wide field isnt the purpose.

The application of this eyepiece is to newts slower than F4.5, and ""Fast"" refractors F5-F8 say that take a 3" EP, or for those folks who will accept the illumination issues with stopping this down to 2".

On these big slow dobs, if I have to upgrade my secondary from 3.5" to 4" it isnt a big deal, as I am well less than 20% CO...

Edited by gatorengineer (03/14/13 10:50 AM)


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Sean Puett
Carpal Tunnel
*****

Reged: 09/06/10

Loc: always cloudy, washington
Re: is anyone planning on buying the ES100 30mm? new [Re: gatorengineer]
      #5732016 - 03/14/13 10:57 AM

That seems to be the consensus. The 3" paracorr would probably cost as much as a tv85, maybe more. Refractors do seem to be the only option unless the big cats come with 3" focusers now.

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johnnyha
Postmaster
*****

Reged: 11/12/06

Loc: Sherman Oaks, CA
Re: is anyone planning on buying the ES100 30mm? new [Re: pbsastro]
      #5732341 - 03/14/13 02:28 PM

Quote:

Meanwhile, the 30/100 will be master of the 7" apo and C14HD.




I am honestly having a hard time seeing how this could possibly work with a C14, at least without significant modifications?


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pbsastro
professor emeritus
*****

Reged: 03/21/07

Re: is anyone planning on buying the ES100 30mm? new [Re: faackanders2]
      #5732995 - 03/14/13 09:05 PM

Quote:

If you plan to get a 24" f3 why wouldn't you want a 3" focuser and secondary to accomodate the ES100 30mm (you would get for your other scope)? It might save you from having to transport so many scopes.




f/3 and 30mm => 10mm pupil. My limit is 5.5mm pupil. That is 17mm Ethos.
Each scope has its unique characteristics. When I go out, I only take one scope.

Edited by pbsastro (03/14/13 09:08 PM)


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pbsastro
professor emeritus
*****

Reged: 03/21/07

Re: is anyone planning on buying the ES100 30mm? new [Re: Scanning4Comets]
      #5733007 - 03/14/13 09:11 PM

Quote:

Quote:

If they build it, they will come ...




...Not for everybody.



Very true. But the same can be said about all the equipment you list.


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pbsastro
professor emeritus
*****

Reged: 03/21/07

Re: is anyone planning on buying the ES100 30mm? new [Re: johnnyha]
      #5733021 - 03/14/13 09:22 PM

Quote:

Quote:

Meanwhile, the 30/100 will be master of the 7" apo and C14HD.




I am honestly having a hard time seeing how this could possibly work with a C14, at least without significant modifications?




Johnny, no modifications needed. C14 and C11 come with 3" opening. Both have a 52mm illuminated circle with illumination above 70% at the edge.
By coincidence (maybe not) the ES30/100 eyepiece has a 52mm field stop.
With Edge version we have flat field and coma correction, so C14HD and ES30/100 is a match made in heaven. Even the weight is not so significant in this size scope.

Pedro


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Sean Puett
Carpal Tunnel
*****

Reged: 09/06/10

Loc: always cloudy, washington
Re: is anyone planning on buying the ES100 30mm? new [Re: pbsastro]
      #5733154 - 03/14/13 10:31 PM

We have another winner. Where do you buy a 3"diagonal though? I am sure someone makes one but, I have not seen any for sale. I haven't looked...

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Scanning4Comets
Markus
*****

Reged: 12/26/04

Re: is anyone planning on buying the ES100 30mm? new [Re: Sean Puett]
      #5733171 - 03/14/13 10:43 PM

Quote:

That seems to be the consensus. The 3" paracorr would probably cost as much as a tv85, maybe more. Refractors do seem to be the only option unless the big cats come with 3" focusers now.




Adding a 3" paracorr to a 7.5 Lb EP hanging off your focuser would be even more insane,


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gatorengineer
Carpal Tunnel
*****

Reged: 02/28/05

Loc: Hellertown, PA
Re: is anyone planning on buying the ES100 30mm? new [Re: pbsastro]
      #5733677 - 03/15/13 09:11 AM

Suggest you look at what the baffle tube diameter is which is reported to be 2.1" Now treat that as a 2.1"field stop 14" or so inches in front of the eyepiece. You will find that you edge illumination is exactly 0 for the 3" 30.... Sorry to be the bearer of bad news. The visual back opening on large cats is irrelevant, its the baffle tube that counts.

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Sean Puett
Carpal Tunnel
*****

Reged: 09/06/10

Loc: always cloudy, washington
Re: is anyone planning on buying the ES100 30mm? new [Re: Scanning4Comets]
      #5733746 - 03/15/13 09:55 AM

No argument here. The scopes that I would want to use an eyepiece like this in (giant dobs) are not really a good match for it. I am too picky to ignore bad edge correction in any form. I can't use my 30mm ES82 without a paracorr at f5 anymore because I am spoiled now. 100* would show even more coma (I believe) because it is just that much bigger afov.

I do think that this eyepiece will be great if you happen to have the right set up for it but, and this is just my opinion, most people won't want to go with this big piece of awesome engineering. What would be cool is if it does sell enough that they make longer focal lengths for those giant refractors because the 10"f15, in example, focal length is 3810mm that is 127x mag and roughly .78 tfov with only a 2mm exit pupil. It would be an excellent fit for that scope but a longer focal length would be nice as well. Since this whole line of thought is fantasy anyway, why not?


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Sean Puett
Carpal Tunnel
*****

Reged: 09/06/10

Loc: always cloudy, washington
Re: is anyone planning on buying the ES100 30mm? [Re: gatorengineer]
      #5734420 - 03/15/13 04:09 PM

Quote:

Suggest you look at what the baffle tube diameter is which is reported to be 2.1" Now treat that as a 2.1"field stop 14" or so inches in front of the eyepiece. You will find that you edge illumination is exactly 0 for the 3" 30.... Sorry to be the bearer of bad news. The visual back opening on large cats is irrelevant, its the baffle tube that counts.




That is unfortunate. Now we are back to just long giant refractors and dobs above f6. (f5 for those not used to a paracorr). What about big standard cass scopes? A few amateurs have them. The Goldendale observatory was donated by an amateur and has a 24" cass in it.


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