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12mm - 60º Options...

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#1 Dave Bush

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Posted 09 August 2020 - 11:43 PM

Looking for such an eyepiece for my 50mm Stellarvue RACI finder.

 

Those I'm considering...

 

BST Starguider (and clones)

Lunt Solar Flat Field

BST Flat Field

Celestron X-Cel LX

Meade HD-60

ES52 10mm (yeah, I know, not 12mm and not 60º but maybe)

 

What I want is the best choice that's likely to get closest to  an aberration free field.  



#2 Aaron_tragle

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Posted 09 August 2020 - 11:44 PM

You could snag a 12mm Radian from televue on the used market, I managed to pick one up for 130 bucks the other day.



#3 Dave Bush

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Posted 09 August 2020 - 11:47 PM

You could snag a 12mm Radian from televue on the used market, I managed to pick one up for 130 bucks the other day.

Oh hey, good idea.  Didn't think of that.  Thanks!



#4 Miranda2525

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Posted 10 August 2020 - 02:11 AM

Looking for such an eyepiece for my 50mm Stellarvue RACI finder.

Those I'm considering...

BST Starguider (and clones)
Lunt Solar Flat Field
BST Flat Field
Celestron X-Cel LX
Meade HD-60
ES52 10mm (yeah, I know, not 12mm and not 60º but maybe)

What I want is the best choice that's likely to get closest to an aberration free field.


I have used a 12mm AT Paradigm in my 10" Orion XTi without a coma corrector and it was aberration free in that telescope. Great eyepiece, highly recommended.
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#5 Jon Isaacs

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Posted 10 August 2020 - 07:42 AM

I have used a 12mm AT Paradigm in my 10" Orion XTi without a coma corrector and it was aberration free in that telescope. Great eyepiece, highly recommended.

 

I have the 12mm AT Paradigm and I also have a StellarVue 50mm finder.  I haven't tried the Paradigm in the finder but it's quite good at F/5, F/4 with field curvature may be pushing things. 

 

The issues I have is that it provides a 3.6 degree field of view, narrow for a finder, and it would be difficult to add cross hairs to it.  A great finder eyepiece in the 50mm SV is the 16mm type 5 Nagler.  It provides 6.3 degrees at 12.5x.  Not easy to add cross hairs.

 

Jon



#6 25585

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Posted 10 August 2020 - 07:53 AM

Price no problem, 11mm Delite. If 50° is an option, the 12mm Vixen SLV. 


Edited by 25585, 10 August 2020 - 07:56 AM.


#7 Dave Bush

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Posted 10 August 2020 - 10:32 AM

I have used a 12mm AT Paradigm in my 10" Orion XTi without a coma corrector and it was aberration free in that telescope. Great eyepiece, highly recommended.

Really?  That's surprising and great to hear.  I may pick one up just to try it out in the main scope.


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#8 Dave Bush

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Posted 10 August 2020 - 10:36 AM

I have the 12mm AT Paradigm and I also have a StellarVue 50mm finder.  I haven't tried the Paradigm in the finder but it's quite good at F/5, F/4 with field curvature may be pushing things. 

 

The issues I have is that it provides a 3.6 degree field of view, narrow for a finder, and it would be difficult to add cross hairs to it.  A great finder eyepiece in the 50mm SV is the 16mm type 5 Nagler.  It provides 6.3 degrees at 12.5x.  Not easy to add cross hairs.

 

Jon

Jon,  I need to keep the exit pupil at or below 3mm due to my astigmatism.  So for the finder that means 12mm or below.  An 11mm T6 Nagler would be great if I could I could find one.   A field of 3.6º is OK for me as I would be using a zero power pointer to get me close and then the finder scope to zero in.  Also I wouldn't need cross hairs.

 

So you too have found that the Paradigm's work well at f/5?  Was that in a coma corrected Newtonian?



#9 Dave Bush

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Posted 10 August 2020 - 10:37 AM

Price no problem, 11mm Delite. If 50° is an option, the 12mm Vixen SLV. 

Yeah the Delite would be great but I'm not sure I want to spend that much for my finderscope.  And yeah, I've had some of the SLVs and they are very sharp but I may want to stay wider than 50º.


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#10 Miranda2525

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Posted 10 August 2020 - 07:16 PM

I have the 12mm AT Paradigm and I also have a StellarVue 50mm finder.  I haven't tried the Paradigm in the finder but it's quite good at F/5, F/4 with field curvature may be pushing things. 

 

The issues I have is that it provides a 3.6 degree field of view, narrow for a finder, and it would be difficult to add cross hairs to it.  A great finder eyepiece in the 50mm SV is the 16mm type 5 Nagler.  It provides 6.3 degrees at 12.5x.  Not easy to add cross hairs.

 

Jon

I have used eyepieces in finderscopes without cross hairs. Close to the 3.5 degrees and I would always be on the mark when centering. Not as good as having cross hairs, but still ok.



#11 25585

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Posted 11 August 2020 - 05:58 AM

If an eyepiece whole FoV can be seen easily, centering anything should not be a problem for visual. Crosshairs can be an annoyance in fact.


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#12 Hesiod

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Posted 11 August 2020 - 06:07 AM

TAL sold their telescopes with a screw-in crosshair which could be applied to any eyepiece provided it has not a lens/group too low 8n the barrel.
It should work with Erfle/Konig/etc...of course there will be aberrations, but guess that in any case can not do much about FC anyway

#13 2696

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Posted 11 August 2020 - 08:53 AM

I have the 12mm BST Starguider and I love it. I really don't notice any sort of aberration aside from a barely noticeable CA on a bright moon, this also may be from my scopes rather than the EP. I think for your finder you can't really go wrong with any of your choices though.

#14 Starman1

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Posted 11 August 2020 - 04:44 PM

Celestron X-Cel LX 12mm

Astrotech Paradigm 12mm

You could probably go longer without obtrusive astigmatism because of the very low power.



#15 Miranda2525

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Posted 11 August 2020 - 06:03 PM

If an eyepiece whole FoV can be seen easily, centering anything should not be a problem for visual. Crosshairs can be an annoyance in fact.

I have an Orion 9x50 RACI finderscope. I wish the crosshairs were thinner because they cover stars up.


Edited by Miranda2525, 11 August 2020 - 06:04 PM.


#16 LDW47

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Posted 11 August 2020 - 06:17 PM

Looking for such an eyepiece for my 50mm Stellarvue RACI finder.

 

Those I'm considering...

 

BST Starguider (and clones)

Lunt Solar Flat Field

BST Flat Field

Celestron X-Cel LX

Meade HD-60

ES52 10mm (yeah, I know, not 12mm and not 60º but maybe)

 

What I want is the best choice that's likely to get closest to  an aberration free field.  

How about the 2”, 12mm, 65° Russell Optics Konig for $80 ? And they are hand made in the USA in limited numbers and are half the weight ! I love my Gary Russells, all 6 of them, lol.



#17 LDW47

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Posted 11 August 2020 - 06:20 PM

Looking for such an eyepiece for my 50mm Stellarvue RACI finder.

 

Those I'm considering...

 

BST Starguider (and clones)

Lunt Solar Flat Field

BST Flat Field

Celestron X-Cel LX

Meade HD-60

ES52 10mm (yeah, I know, not 12mm and not 60º but maybe)

 

What I want is the best choice that's likely to get closest to  an aberration free field.  

Or don’t overlook the up and coming Svbony line up vs the price, they won’t stay that low forever !



#18 Starman1

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Posted 11 August 2020 - 06:22 PM

I have an Orion 9x50 RACI finderscope. I wish the crosshairs were thinner because they cover stars up.

The Stellarvue F50 has an eyepiece with really thin wires--almost invisible against the sky.

It's an easily focusable finder, too.


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#19 Miranda2525

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Posted 12 August 2020 - 10:29 PM

How about the 2”, 12mm, 65° Russell Optics Konig for $80 ? And they are hand made in the USA in limited numbers and are half the weight ! I love my Gary Russells, all 6 of them, lol.

And how are those at f/4 ? Most finderscopes are close to that FL.


Edited by Miranda2525, 12 August 2020 - 10:31 PM.


#20 Miranda2525

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Posted 12 August 2020 - 10:30 PM

The Stellarvue F50 has an eyepiece with really thin wires--almost invisible against the sky.

It's an easily focusable finder, too.

That's great to know !!!  I will look into getting one of those.

 

Thanks for that information!!!



#21 LDW47

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Posted 12 August 2020 - 10:35 PM

And how are those at f/4 ? Most finderscopes are close to that FL.

I really can’t say, I have a couple of f4.8’s but they are 1.25”, i threw that suggestion out there but it has to be research for compatibility / useability.




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