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100* Eyepieces

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#1 clusterbuster

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Posted 11 December 2017 - 01:53 AM

I have become a big fan of 100* Eyepieces, not only are they really good to look through, they also allow the object to stay in the field of view longer !

Mark


Edited by clusterbuster, 11 December 2017 - 01:53 AM.

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#2 DLuders

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Posted 11 December 2017 - 03:32 AM

Yes, I also like eyepieces with 100-degrees Apparent Field of View (AFOV).  I recently got a used Meade Series 5000 1.25"-dia., 10mm, 100* Mega Wide Angle (MWA) eyepiece to use with my manual Celestron 127mm Mak.  That telescope is f/11.8 and has rather narrow views with 52* AFOV 9.7mm Meade Series 4000 Super Plossl eyepiece, so the 100* MWA helped keep objects in view longer.  At 150x magnification, I could fit the recent "Super Moon" entirely in the eyepiece.

 

Using the interactive Field of View Calculator https://astronomy.to.../field_of_view/ , I compared three different eyepieces on the Moon.  The 100* AFOV eyepiece view is the middle (yellow) circle:

 

Moon w Meade 9.7mm vs MWA 10mm vs Luminos 15mm.JPG

 

 

 

  


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#3 DLuders

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Posted 11 December 2017 - 03:40 AM

Here's another way of comparing the views with 100* AFOV eyepieces.  Using the Stelvision Telescope Simulator https://www.stelvisi...lator/index.php , one can select the Sky Object (in this case, the Moon), click on the "Detailed Simulation -- Choose Your Eyepieces" option, enter different eyepieces, and then get these comparison views:

 

9.7mm 52-deg AFOV of Moon.JPG    10mm 100-deg AFOV of Moon.JPG

 


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#4 Messyone

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Posted 11 December 2017 - 04:44 AM

That’s great.

For me I tried 100’s 82’s 76’s 68’s 60’s 50’s and 42’s....phew.

 

As I have tracking the 76’s and 68’s are my firm favourites. Very easy to look through which is something I never was comfortable with larger AFOV things. 

 

All I have now are Morpheus, Panoptics and UOVT Ortho set that I cant sell.

 

Each to their own....you have to work it out for yourself, which is what I have done.

 

Matt


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#5 rogeriomagellan

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Posted 11 December 2017 - 05:47 AM

That’s great.

For me I tried 100’s 82’s 76’s 68’s 60’s 50’s and 42’s....phew.

 

As I have tracking the 76’s and 68’s are my firm favourites. Very easy to look through which is something I never was comfortable with larger AFOV things. 

 

All I have now are Morpheus, Panoptics and UOVT Ortho set that I cant sell.

 

Each to their own....you have to work it out for yourself, which is what I have done.

 

Matt

Hi, Matt.

 

Your Morpheus eyepieces must work great for planetary and star cluster observing. How many focal lengths do you own?



#6 paradise

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Posted 11 December 2017 - 06:31 AM

I have become a big fan of 100* Eyepieces, not only are they really good to look through, they also allow the object to stay in the field of view longer !

Mark

The problem is : without a large ER the advantage can be reduced, that's why, personnally, I am not a fanatic. Cause of the weight, coma, too...

 

I find the ES 92° Serie more interesting on this point.


Edited by paradise, 11 December 2017 - 06:33 AM.

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#7 Bjorg63

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Posted 11 December 2017 - 06:37 AM

In general yes, the larger the AFOV of the eyepiece, the longer the target object DSO will stay in view. The focal length and aperture of your telescope is a big factor in this calculation. Play around with the Astronomy Tools FOV calculator with different focal length and aperture telescopes. For me I have a 10" F4.7 and 20" F5 newtonian, which give very different views in the same eyepiece.

 

I too am a big fan of the larger AFOV eyepieces. Someday I will get into the 100's.


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#8 flt158

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Posted 11 December 2017 - 08:02 AM

Can anyone inform me of a 3mm eyepiece with a large apparent field of view?

 

Aubrey.



#9 CrazyPanda

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Posted 11 December 2017 - 08:20 AM

Can anyone inform me of a 3mm eyepiece with a large apparent field of view?
 
Aubrey.

The widest I've seen is the 3mm TeleVue Delite, which has a 62 degree apparent field. If you wanted something wider in that focal length, you'd need to barlow a 6mm Ethos, Delos, or Orion Lanthanum Ultrawide.

I have become a big fan of 100* Eyepieces, not only are they really good to look through, they also allow the object to stay in the field of view longer !
Mark


What gets me is how much context you have to work with. Seeing an object at high magnification but still surrounded by stars and space is pretty amazing.

Edited by CrazyPanda, 11 December 2017 - 08:22 AM.

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#10 MitchAlsup

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Posted 11 December 2017 - 10:48 AM

Can anyone inform me of a 3mm eyepiece with a large apparent field of view?

if 3.7mm is "short enough" then there is the 3.7 Ethos.


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#11 havasman

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Posted 11 December 2017 - 01:44 PM

 

Seeing an object at high magnification but still surrounded by stars and space is pretty amazing.

That's it for me too. Freedom from seeing the field stop at all allows me to view more effectively into the field. With fully tracking scope, the width of the field frames beautifully and also facilitates, for me, object hopping through the field to identify that faint tiny object more easily. 


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#12 John Huntley

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Posted 11 December 2017 - 05:21 PM

Can anyone inform me of a 3mm eyepiece with a large apparent field of view?

 

Aubrey.

Hi Aubrey,

 

Apart from the Ethos SX 3.7mm the closest to 3mm that I'm aware of is the Skywatcher Myriad 3.5mm which is, like the Ethos SX, a 110 degree AFoV eyepiece.

 

I did a little piece on another forum a while back comparing the Myriads with Tele Vue and Pentax equivalents (I didn't have the Ethos SX's available back then):

 

https://stargazerslo...ield-eyepieces/

 

The Myriad range appear to be the same as or very similar to some other 100/110 degree eyepiece ranges available today.

 

If you want spot on 3mm and 100 degrees then 6mm Ethos plus the 2x Powermate will do the trick as well.


Edited by John Huntley, 11 December 2017 - 05:22 PM.

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#13 Mike W.

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Posted 11 December 2017 - 08:50 PM

3.5 Williams Optics 110°


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#14 Starkid2u

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Posted 12 December 2017 - 05:41 PM

I LOVE my ES 100* 20MM! So much so that I'm getting the 9MM 100* EP as well! That should tide me over for the foreseeable future!

 

STARKID2U


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#15 Jon Isaacs

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Posted 12 December 2017 - 06:08 PM

I LOVE my ES 100* 20MM! So much so that I'm getting the 9MM 100* EP as well! That should tide me over for the foreseeable future!

 

STARKID2U

 

For sure.. 

 

Assuming the foreseeable future ends next Friday..  :)

 

Soon enough you'll be wanting the 14 mm and those three ought to hold you for a while. 

 

Jon


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#16 csrlice12

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Posted 12 December 2017 - 11:38 PM

The ES100 14mm was the gateway drug to the Ethos...


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#17 Marcsabb

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Posted 13 December 2017 - 01:58 AM

Oddly enough, for the me the 'wide angle' fever kicks in only at high magnification, for moon or clusters. When it comes to >20mm eyepieces, I'm perfectly fine with Plossl or similar designs 

 

Does anybody feels the same?


Edited by Marcsabb, 13 December 2017 - 02:00 AM.


#18 Shneor

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Posted 13 December 2017 - 02:19 AM

Oddly enough, for the me the 'wide angle' fever kicks in only at high magnification, for moon or clusters. When it comes to >20mm eyepieces, I'm perfectly fine with Plossl or similar designs 

 

Does anybody feels the same?

Don't know what telescope you have, but with my 22" f/4 dob I use my ES25mm 100* (usually with a filter) for larger targets like M42, M8, the Veil, etc. I do use my 20mm ES100* for framing larger objects, and for finding objects when I'm lazy.



#19 Mike W.

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Posted 13 December 2017 - 08:17 AM

Be careful of the the fever, things start growing out of your eyepiece holder of the focuser, like mine did.

I'm telling you it's hideous 

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#20 paradise

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Posted 14 December 2017 - 07:20 AM

I LOVE my ES 100* 20MM! So much so that I'm getting the 9MM 100* EP as well! That should tide me over for the foreseeable future!

 

STARKID2U

I love my ES 100° 20mm too, but that does not mean that it is THE best EP in its category.

 

In its own line, I think that the best one is the 14mm, followed by the 20mm, the 25mm beeing under, and other focals too, that is what some people report.

 

I think that the 92° line is a bit better, for the brightness and the contrast.



#21 noisejammer

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Posted 14 December 2017 - 09:57 PM

I've just first-lighted my ES 9/120... well, I tried previously but clouds, a warm diagonal, snow and generally miserable seeing got in the way. Things were better this evening; It's almost surreal to have 90x magnification and a field 1.3 degrees wide. An observing hood seems to be essential.

 

It seems to work well with the NPB filter too. Yay!



#22 opticsguy

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Posted 15 December 2017 - 12:31 AM

ES 9/120,  wonderful.......



#23 Sokar80

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Posted 27 February 2018 - 07:23 AM

Hello, i have made this google sheet. It regroups some specifications of eyepieces wide angle (100-110°).

If you know other eyepiece, don't hesitate to give here the name of the eyepiece :)

 

https://docs.google....WrSo/edit#gid=0



#24 aatt

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Posted 27 February 2018 - 08:49 AM

 

Can anyone inform me of a 3mm eyepiece with a large apparent field of view?

if 3.7mm is "short enough" then there is the 3.7 Ethos.

 

Stellarvue 3.7 and it has gotten very good press.



#25 RalphMeisterTigerMan

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Posted 27 February 2018 - 10:25 AM

As a long time sufferer of that extremely rare and often misunderstood affliction known as "spontaneous Human Combustion" , and having to constantly carry a large fire extinguishers on my person 24/7. I am both shocked and appalled at your unconcerned and even cavalier attitude to these extremely high temperature Eyepieces.

   Am I the only one aware of the potential and hazardous danger that these Eyepieces represent.

   I personally have been forced to restricting my eyepiece set to less than 30-degress....yes...much better. Absolutely no danger of an accidental fire there.

 

  So I'm sorry if I have to keep turning down your invitations to your hot winded and temperature extreme observing sessions.

So, from north of the arctic circle and enjoying my "Eskimo Pies" while I observe...here's looking at you kid!

 

BTW, anyone have any good advice on how avoid the men in the white suits, brandishing Uber large butterfly nets and who happen to a wide assorted sizes of those jackets where the arms are fixed in the front?

 

"Hyper-wide, hyper-wide.my kingdom fro a hyper-wide.

 

Visiting hours are from 1:00 P.M. to 4:30 P.M. please come visit me at the Ultra MaX Prison for the criminally insane. Please remember to visit the gift shop before visiting me.

 

Thanks for putting up with my Rants.

 

RalphMeisterTigerMan




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