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Thread: Meade 5.5MM Ultra Wide on 4" Reflector

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    Default Meade 5.5MM Ultra Wide on 4" Reflector



    Hello everybody. New guy here and I know I'll get pummeled for this question, but.....I've got an old Celestron Nexstar 114gt 4" reflector scope that is in good condition. Just cleaned it out too. Recently I bought a new eyepiece for it...a Meade 5.5 mm Ultra Wide Angle 1.25" Eyepiece - 07740. The wide angle view is great, but the focus, not so much. Question is: is this eyepiece too much for my scope to handle? When using a 10mm eyepiece, the moon and Jupiter and Mars look normal, but with the 5.5mm ultra wide, same objects are very fuzzy. Night was cool, low humidity, almost no light pollution.

    Also, the Nexstar 114gt is a 1000mm focal-length reflector.

    Hope that all makes sense. thanks for the help.

    BMag

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    Default Re: Meade 5.5MM Ultra Wide on 4" Reflector

    Hello and welcome to the forums.
    There will be times of good seeing/ transparency that will allow the use of the 5.5mm but it is a very high power for your telescope.
    Typically something around a 8mm will be more useful for high power viewing.

    How is the collimation of the telescope?
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
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    Default Re: Meade 5.5MM Ultra Wide on 4" Reflector

    Thought so. The collimation could be better. I'm not getting the perfectly round out of focus image, it's more oblong/oval shaped, blurred in one direction. that means I need to adjust the three main mirror screws on the back, correct?

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    Default Re: Meade 5.5MM Ultra Wide on 4" Reflector

    Those will adjust the primary mirror and you will need to check that the secondary is aligned under the focuser.
    Do you have a collimation cap and Cheshire eyepiece?

    A slight correction to my first post, your telescope at f/8.8 a 9mm eyepiece would be a better high power focal length.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

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    Default Re: Meade 5.5MM Ultra Wide on 4" Reflector

    If not 100% on collimating here is a popular site that explains the steps.
    Astro Babys Guide to Collimation - Newtonian Telescope - Reflector
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
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    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite Eyepieces: A-Z

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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

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    Default Re: Meade 5.5MM Ultra Wide on 4" Reflector

    I do not have either, but I now see the importance of having them. Thanks for the info. Looks like I've got some alignments to do.

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    Default Re: Meade 5.5MM Ultra Wide on 4" Reflector

    The lunar surface can normally take a lot of magnification so your 5.5mm may give you some very good views on nights that are not quite up to supporting that much magnification on other objects.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
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    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite Eyepieces: A-Z

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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

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    Default Re: Meade 5.5MM Ultra Wide on 4" Reflector

    Oh yes, was using it the other night on the waxing half moon. Very impressive views, almost blinding though with that wide angle lens. It was only slightly blurry, not sure if it was the scope, my eyes, or atmospherics. Probably all three.
    Gabby76 likes this.

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    Default Re: Meade 5.5MM Ultra Wide on 4" Reflector

    It can be quite bright if you look while your eyes are dark adapted.
    A variable polarizer filter helps with that nicely.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2"
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite Eyepieces: A-Z

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

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    Default Re: Meade 5.5MM Ultra Wide on 4" Reflector

    Perfect, thanks. I could use one. Cloudy skies for the next few nights, so I guess I'll get my order in now.

 

 
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