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Thread: Need few suggestions

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    Airwolf's Avatar
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    Default Need few suggestions



    Hey everyone,

    I was hoping I could get some guidance with purchase of eyepieces for my telescope. I own a XT6 Dobsonian and used to have a 10mm and 25mm eyepieces if memory serves along with some moon filters. I bought the telescope few years ago and that's what it was supplied with (minus the filters) although I think it has changed recently. Couple of months ago I lost my accessories for the telescope during the move
    So now I am using this opportunity to purchase new eyepieces plus barlow lens to get most out of my telescope. The following item seems interesting after my cursory research Orion 1.25" Premium Telescope Accessory Kit | Orion Telescopes

    What do you fellas think, shall I get that or would you recommend I get certain eyepieces separately? I am pretty much less than an amateur still so I would appreciate any input

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    Don Alvarez's Avatar
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    Default Re: Need few suggestions

    Yeah, Orion stopped including the 10mm Plosssl with the new XT Classic Dobs and only includes the 25mm Plossl, probably because the 10mm is a duplicate of the one in this kit. You'll also notice the kit has a big focal length gap between 40mm and 17mm where the 25mm fits nicely. It's almost like they're guiding you towards buying it.

    I think the general advice around here is to stay away from the kits and buy your EP's separately and in the end you will end up with something of better quality. Much depends on your budget I suppose.

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    Default Re: Need few suggestions

    Welcome to the forum Airwolf!

    Agree with Don. The filters included in the set are useless and half of EPs will not be used. You are better off buying EPs one at the time and you don't need many. 3-4 EPs should cover your observing needs.

    Do you have any EPs at the moment?

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    Default Re: Need few suggestions

    Thanks fellas for your input. And I do not have any eyepieces at all, I lost everything that I had for my astronomy set; eyepieces, filters, charts and manuals hehe telescope was too big to lose. So what eyepieces would you suggest I get? I want to be able to look as closely as I can to the planets and nebulae with as much detail the scope would allow me, and I suppose one or two filters would do for moon and planetary viewing?

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    Default Re: Need few suggestions

    Your DOB is F8 scope. So

    For the moon and planets ~8mm EP
    For small DSOs ~15mm
    and for wide field views and large DSOs ~32-40mm

    I assume your scope has 1.25" focuser. In this case 32-40mm is covered by a good quality Plossl.

    GSO Plossl have good reputation,

    GSO 1.25" Plossl Eyepiece - 32mm

    but they are not always available. So Meade 4000 or similar should be fine.

    Meade Series 4000 1.25" Super Plossl Eyepiece - 32mm # 07176-02

    For ~8mm and 15mm I would suggest Agena/Astrotech Dual ED EPs:

    1.25" Telescope Eyepieces | AgenaAstro.com - Agena Dual ED

    Stay away from your typical color "planetary" filter sets. Color filters can be productive on planets but they need to be of good quality (read expensive ). Instead, I would suggest

    Baader Neodymium Moon & Skyglow Filter with IR Cut - 1.25" # FMS-1 2458305A

    Works great to cut glare and enhance planetary details without affecting natural colors too much.

    For moon variable polarizing filter is the best

    BST 1.25" Variable Transmission Polarizing Filter

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    Default Re: Need few suggestions

    Buying individual accessories can be expensive compared to what you get when buying a telescope - the latter might be a better deal. For instance https://www.highpointscientific.com/...-telescope-ad8 , you will get 2 decent eyepieces, a laser collimator, moon filter and a great scope with adjustable Alt bearings, very smooth Az a la lazy Susan, a RACI finder, for not a whole lot more. Consider an AD10 for a noticeable jump in aperture. More money than you wanted to spend but if you have to spend it is worth considering. Those GSO Dobs are simply a super deal.
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    Default Re: Need few suggestions

    Yes Bigzmey, the focuser is 1.25" and those suggested eyepieces would allow for closer viewing of the planet right? I am personally okay with two EPs that allow for best viewing experience. And is getting a barlow lens a good idea for magnification?

    @Camelhat Honestly I do want to get a new scope but right now my budget only allows me to spend $200 for astronomy
    Macrob1 and Brodavid1953 like this.

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    Default Re: Need few suggestions

    Quote Originally Posted by Airwolf View Post
    Yes Bigzmey, the focuser is 1.25" and those suggested eyepieces would allow for closer viewing of the planet right? I am personally okay with two EPs that allow for best viewing experience. And is getting a barlow lens a good idea for magnification?
    Hi and welcome to the forum. Eyepiece selection can be confusing at first, and it is a good idea to just get a couple until you know what you want. Your scope has a focal length (FL) of 1200mm, so the eyepieces that Bigzmey has suggested will give you magnifications of 1200/(eyepiece FL). So the GSO and Meade 32mm eyepieces will give a magnification of 1200/32=37.5, the Agena 15mm will give 1200/15=80, and the Agena 8mm will give 1200/8=150. This is a good spread of magnifications for the objects he has suggested. 150x is fine for the planets in most conditions. They will look small at 150x, but with practice you will see a fair bit of detail, especially on Jupiter and Saturn. On a really good night (i.e.: steady, transparent skies) you may be able to push the magnification to 200x or more with your scope- which a 6mm eyepiece will give you. If you get a barlow lens you could go to 300x with the 8mm eyepiece, but I don't thing the atmospheric conditions would let you do that too often.

    His suggestions are (I assume) also based on the understanding that a 1mm exit pupil (i.e.: the diameter of the circle of light that actually goes into your eye; you can see this when you step back from an eyepiece and look at the little circle of light in its centre) is generally ideal for high power viewing, giving you the best contrast and detail. This is achieved with an 8mm eyepiece for an f8 scope like yours. (The exit pupil diameter is calculate by dividing the FL of the eyepiece by the F-ratio of the telescope) Likewise, a 2mm exit pupil is ideal for small DSO's (provided by the 15mm eyepiece), and a 4mm exit pupil is great for larger DSO's (from the 32mm eyepiece).

    Once you get a smaller exit pupil than around 1mm (e.g.: if you used a 2x barlow with the 8mm eyepiece to give 300x, this would give an exit pupil of 1/2=0.5mm) you can begin to lose a bit of contrast, and sometimes "floaties" in your eye can spoil the view. You can increase the magnification (and shrink the exit pupil) beyond what Bigzmey recommended, but I would also suggest you wait a bit until you know exactly what you want and what your scope is capable of.

    Personally I think that the suggested combination of 32mm, 15mm and 8mm eyepieces is ideal for a beginner with a 1200mm f8 scope like yours. This fits your budget nicely, and you really won't use a barlow much at this stage.

    If you want to learn more without the expense, then I suggest strongly you join a local astronomy club. We astronomers are always happy to show off our equipment!

    All the best,

    Dean

    (PS: if you really only want 2 eyepieces at this stage, then probably one at 25-32mm FL and another of 8-10mm FL would be OK. I think the 3 eyepieces is probably a better way to go though.)

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    Default Re: Need few suggestions

    Appreciate the detailed suggestions friends, hehe very mathematical reply I like that and I think you're right DeanD, 3 eyepieces would be a better way to go to allow for little more room to different viewing experience.

    Ok so the following should be good?

    Meade Series 4000 1.25" Super Plossl Eyepiece - 32mm # 07176-02
    Meade Series 4000 1.25" Super Plossl Eyepiece - 15mm # 07173-02
    Agena 1.25" Starguider Dual ED Eyepiece - 8mm
    BST 1.25" Variable Transmission Polarizing Filter
    GSO 1.25" 2x "Shorty" Achromatic Barlow Lens # GS2BL

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    Default Re: Need few suggestions

    Quote Originally Posted by Airwolf View Post
    Appreciate the detailed suggestions friends, hehe very mathematical reply I like that and I think you're right DeanD, 3 eyepieces would be a better way to go to allow for little more room to different viewing experience.

    Ok so the following should be good?

    Meade Series 4000 1.25" Super Plossl Eyepiece - 32mm # 07176-02
    Meade Series 4000 1.25" Super Plossl Eyepiece - 15mm # 07173-02
    Agena 1.25" Starguider Dual ED Eyepiece - 8mm
    BST 1.25" Variable Transmission Polarizing Filter
    GSO 1.25" 2x "Shorty" Achromatic Barlow Lens # GS2BL
    Yes, this will work. You can also take off the nose lens from the barlow and screw directly on the EP for 1.5x magnification factor. So your 32mm becomes 21mm (56x), 15mm becomes 10mm (120x) and 8mm becomes 5.4mm (225x).

    I would still recommend 15mm Dual ED over the Plossl, but Plossl works to.
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