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  1. #1
    Sunnycharlie's Avatar
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    Default Eyepiece suggestions wanted



    I have an Orion xt8i on order. I have picked up a second hand wide angle 30mm ep and will have the 10mm and 25mm that come with the scope. What I am after is a high powered ep with a wide field of view to view planets and the moon. My budget would be around the £100 mark. What suggestions do you have?

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    Can I add that I am currently watching an Orion 6mm expanse ep on eBay. Is this any good? Worth buying?

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    HeXploiT's Avatar
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    Quote Originally Posted by Sunnycharlie View Post
    What I am after is a high powered ep with a wide field of view
    That statement is contradictory as a wide field of view = low power.

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    I have heard good things about the expanse eps. I have never used one, but have read favorable reviews.
    name: Derek

    Various
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    and such.

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    Quote Originally Posted by HeXploiT View Post
    That statement is contradictory as a wide field of view = low power.
    Hardly contradictory.

    A number of short focal length EP's useful for higher magnification come in a wide field version [82 degrees], such as Nagler 5mm and 3.5mm.

    I dont know what the exchange rate is for the currency the OP listed but I do know that my 5mm Nagler is fantastic in my XT8i for planets (gives 240x). I have also used a Stratus 3.5mm [68 degrees] on many a night with good success in this same instrument (giving 340x, for example to glimpse Triton from a dark site).
    Last edited by MarkM; 03-15-2010 at 08:22 PM.
    Location: 30° 19' N; 97° 54' W; elev 248 meters; yellow/green zone; NELM 5.7
    Instruments: Obsession 15" Dob; Orion XT8i; 2" refractor (Galileoscope); Televue EP arsenal; Bushnell 7X50 binos
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    HeXploiT's Avatar
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    Quote Originally Posted by MarkM View Post
    Hardly contradictory.

    A number of short focal length EP's useful for higher magnification come in a wide field version [82 degrees], such as Nagler 5mm and 3.5mm.

    I dont know what the exchange rate is for the currency the OP listed but I do know that my 5mm Nagler is fantastic in my XT8i for planets (gives 240x). I have also used a Stratus 3.5mm [68 degrees] on many a night with good success in this same instrument (giving 340x, for example to glimpse Triton from a dark site).
    Hmmm....guess I would have to look through one myself to comprehend how this can be.

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    Quote Originally Posted by HeXploiT View Post
    Hmmm....guess I would have to look through one myself to comprehend how this can be.
    It's just a matter of semantics, not physics.

    Sure the actual field of view may be only a half degree or less but when speaking about eyepieces one regularly uses the term "wide field" to talk about eyepieces that have a stated fov of 68 degrees or more. It's just part of the terminology and helps when talking about different ep's of similar focal length--a 6mm plossl would be considered to have a "narrow" fov while a 6 mm ethos would have a "wide" field. Of course, both would be considered "narrower" vs the true field of a 32mm plossl--which is why some adjective describing the focal length usually accompanies the description of the field width (eg, "short focal length, wide field")
    Location: 30° 19' N; 97° 54' W; elev 248 meters; yellow/green zone; NELM 5.7
    Instruments: Obsession 15" Dob; Orion XT8i; 2" refractor (Galileoscope); Televue EP arsenal; Bushnell 7X50 binos
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  9. #8
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    The Nagler 5mm is £200+ in the UK- a wee bit pricey!
    The Stratus is between £100-£150. Can the xt8i handle a 3.5mm? What's the most poweful you can go on the xt8i?

    Anyone else know about the Oripn Expanse 6mm?

  10. #9
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    Quote Originally Posted by Sunnycharlie View Post
    The Nagler 5mm is £200+ in the UK- a wee bit pricey!
    The Stratus is between £100-£150. Can the xt8i handle a 3.5mm? What's the most poweful you can go on the xt8i?

    Anyone else know about the Oripn Expanse 6mm?
    My Xt8i handles the 3.5mm no problem.

    I forgot to mention the Meade UWA series--these are pretty slick--not too expensive and and much lighter and smaller than a Stratus--they boast a 82 degree field while the SWA series is 68 degrees. I own a 6.7mm UWA and it does quite well on planets and bright globulars. If I had known better when I got my XT8i, I would have chosen the Meades over the Stratuses due to weight, a wider FOV and what I think is slightly better optics.

    Regarding upper magnification for the XT8i: Over the course of 5 months I used a 3mm Orion Edge-On for Saturn at least 10 times when the seeing was good--this gave a sharp image of the planet at 400x--an experience that lead me to go deep into this hobby. Of course my results may not mimic yours or others at all--achieving this high magnification depends a lot on the jet stream over your locale which affects atmospheric stability.

    I can say that, using my XT8i, I rarely had any problem getting to 240x for Saturn, Jupiter, Uranus or Neptune with either a 5mm Nagler or 5mm Stratus--which is why I think this would be a good EP choice that will get a lot of use on planets.
    Location: 30° 19' N; 97° 54' W; elev 248 meters; yellow/green zone; NELM 5.7
    Instruments: Obsession 15" Dob; Orion XT8i; 2" refractor (Galileoscope); Televue EP arsenal; Bushnell 7X50 binos
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  12. #10
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    The Meade UWA eps look interesting. I have a cousin in the USA who may be able to get one for me- they are closer to £200 in the UK!!!

    If I bough the 6.7m UWA, I would have the option of adding a barlow and doubling the magnification. How much difference does a barlow make to the quality of the image? Would it negate spending a lot of money on a decent ep? Or would I be better off with the 4.7mm UWA? (I'd buy both if I had the money!!)

 

 
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