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Recommendations for Eyepiece for FSQ-106EDXIII and 1.6X Extender

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#1 Bloated Star

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Posted 03 July 2020 - 02:50 PM

I have never used my FSQ for visual astronomy. However, I was wondering whether, using my 1.6x extender, which brings the focal length to 848 mm, it might be worth buying a good eyepiece to view the planets. Does anyone, including anyone who has used an FSQ with the extender first visual use, have any recommendations?

#2 213Cobra

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Posted 03 July 2020 - 04:20 PM

I routinely use an FSQ-106ED with the Q1.6X Extender. It of course works splendidly with my Takahashi 90° UW and 52° TOE eyepieces, but I equally well use this scope + extender with my various Nagler, DeLite, Takahashi 32mm Erfle, Leica & Baader Zoom eyepieces. The flat field makes the f/5 ratio less challenging to eyepieces than a same-speed triplet or doublet. I've even used the FSQ with Plossls when I had some. In what price bracket do you want to be, and if you're buying only one eyepiece for this, what exit pupil or magnification are you striving for?

 

I have FSQ-106ED and FSQ-85. I use both only for visual. No AP, ever.

 

Phil


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#3 Bloated Star

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Posted 03 July 2020 - 04:30 PM

Well, I

#4 Bloated Star

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Posted 03 July 2020 - 04:34 PM

Well, I am looking in $300-500 range. Forgive me as I don’t do much visual so if I’m off base, I apologize but I’d assumed I didn’t want to go higher than say 125x so was thinking maybe an 8 mm. I’d likely use it primarily for planetary and lunar viewing and perhaps get another EP in the future some of the brighter nebula

#5 213Cobra

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Posted 03 July 2020 - 06:48 PM

With 848mm effective focal length for the scope + Q1.6X, the 5mm Nagler will yield ~169X at a usable exit pupil of 0.625mm. If you can swing it, add a 3.5mm Nagler for ~242X @ exit pupil of a still usable 0.44mm (at least it is for me -- my exit pupil cutoff is 0.4mm). This, assuming you want to start over 125X. An 8mm eyepiece would yield only 106X.

 

If those exit pupils concern you, then a 6mm Delos yields 141X @ 0.75mm exit pupil.

 

Note that if you settled for 62° AFOV, you could get both 7mm & 4mm DeLites for 121X (0.875mm ep) and 212X (0.5mm ep) respectively, together right at the top of your price range.

 

The FSQs give sensational views at low magnifications, at their native focal lengths. So it's worth getting one or two long FL scanners. But if you do just note to steer clear of eyepieces having a design that places the field stop above the eyepiece shoulder. You can stumble into a combination wherein the FSQ-106EDx cannot give you enough in-travel for the system to reach focus.

 

Phil



#6 Bloated Star

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Posted 03 July 2020 - 08:32 PM

Thank you very much for that detailed information. Out of curiosity, what’s your favorite EP for planetary viewing with your setup?

#7 213Cobra

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Posted 03 July 2020 - 09:19 PM

I have multiple scopes as you can see in my signature, so preferences vary. But for planets and lunar through the FSQ-106ED + Q1.6X, my go-to is the Tak UW 90° set, especially 7mm, 5.7mm, 3.3mm. I didn't suggest them because each one is over your stated budget. If sky conditions are exceptional for seeing, I'll go to DeLites plus my Nagler 3.5mm. Under the most perfect seeing conditions I will move to the Tak TOE 4mm and 3.3mm with that particular scope and extender, sacrificing AFOV for ultimate detail retrieval.

 

Phil



#8 Bloated Star

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Posted 03 July 2020 - 09:59 PM

Well, after reading about them, I’m leaning toward the Delites. I’ve got an extension tube on the way so I’ll decide soon. Thank you again for your fantastic help!
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#9 213Cobra

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Posted 04 July 2020 - 02:02 AM

Happy to help. -Phil



#10 leviathan

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Posted 04 July 2020 - 03:58 AM

I'm also using FSQ-106 visual, but with binoviewer. Mark V and 2.6x GPC works great !


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#11 DRodrigues

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Posted 04 July 2020 - 06:16 AM

I'm also using FSQ-106 visual, but with binoviewer. Mark V and 2.6x GPC works great !

The FSQ-106 is on my wish list to test with my bino-combos set-ups for day-light use http://www.pt-ducks....#CR-binoviewing - no need to use GPCs to reach focus!!! If we didn't were at a continent distance I would ask to visit you...
 


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#12 25585

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Posted 05 July 2020 - 06:46 AM

The FSQ-106 is on my wish list to test with my bino-combos set-ups for day-light use http://www.pt-ducks....#CR-binoviewing - no need to use GPCs to reach focus!!! If we didn't were at a continent distance I would ask to visit you...
 

Great site! waytogo.gif




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