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best eyepieces for a f 10 12 inch sct

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#1 youngbill

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Posted 25 January 2021 - 02:19 PM

I have recently purchased a new lx90 12 inch sct.  All of my previous scopes have been in the f 4.5 to f 7.7.  What eyepieces would you recommend for a f 10 3000 mm focal length.  I do have a Q70 32mm.  I really like it.  I also have a nagler 16 mm.  I need something in the mid 20 mm range and something over 32mm.  Please give me some ideas.  

 

Thanks for your help.



#2 SeattleScott

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Posted 25 January 2021 - 05:41 PM

You could get the 38mm Q70/Agena for low power. More expensive would be maybe vixen 42lvw, Pentax 40XW, Televue 41 Panoptic, etc.

For mid 20’s, you could go 22 Nagler, 24 ES 82, Meade 28mm PWA, Panoptic (27, 24, 22), APM 24 UFF or rebrands, those are the ones I can think of anyway. I believe there is also a 26mm Q70.

Scott

Edited by SeattleScott, 25 January 2021 - 05:43 PM.


#3 25585

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Posted 26 January 2021 - 12:01 PM

Lowest magnification for 2" fit may be a 60mm Masuyama, but a Tele Vue 55mm Plossl would do. Wider FoV, you would need 3" fit & accessories like the ES100 30mm & 3" diagonal.



#4 Astro-Master

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Posted 26 January 2021 - 10:03 PM

I would suggest the APM UWA 20mm 100* eyepiece with a power of 152x and a .65* degree Field of View with an ideal 2mm Exit pupil for DSO's for $275 from EyepiecesEtc.com.

 

The APM 20mm 100* eyepiece will give you a slightly larger FOV than even a 24mm 82* eyepiece with a power of 127x and a .64* FOV, and the APM 20mm with its higher power will give you a darker background and better contrast on Galaxies and DSO's.  This would eliminate the need for a mid 20mm eyepiece.

 

I've had years of experience with big Dobs and 100* eyepieces and the views of galaxies being framed at 100 degree fields of view at high power in large scopes is the best IMHO.

 

Trying to get a much larger field of view than your 32mm Q70 is a loosing battle with a 3,048mm focal length.  Even with a TV 55mm Plossl your FOV will only be .9 degrees with a power of 55x, hardly worth the trouble and expense.


Edited by Astro-Master, 26 January 2021 - 11:03 PM.


#5 DHurst

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Posted 26 January 2021 - 10:09 PM

When I had my 12”sct, I think my main line up was 31mm Nagler, 22mm t4,  14mm Meade UWA, and 8.8mm UWA, along with a few in between that were not always used.



#6 youngbill

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Posted 27 January 2021 - 10:32 AM

thanks for the come backs.  I will take all into account.



#7 rkelley8493

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Posted 27 January 2021 - 01:20 PM

A few options:

 

Max True Field of View:  Pentax XW 40, TeleVue 41 Panoptic, Explore Sci 40mm 68°, TeleVue 55mm Plossl 

Wide angle 30-ish millimeters:  TeleVue 31T5 Nagler, Explore Sci 30mm 82°, TeleVue 35 Panoptic, Pentax XW 30, APM UFF 30mm 

Ultra Wide & Hyper Wide 20-ish millimeters:  TeleVue 22T4 Nagler, TV 21 Ethos, APM HDC 20mm 100°, Stellarvue Optimus 20mm


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#8 OldManTaco70

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Posted 30 January 2021 - 04:42 PM

12" LX200 Classic

Meade 56mm SP = essentially my finder EP

TV N5 31mm =  my viewing everything/fav EP

TV Ethos 17mm, Delos 10mm & Ethos 6mm = when conditions allow

 

All but the 31mm bought on CN classifieds

 

And an Orion 20mm reticle to improve the accuracy of my 2 star alignments,




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