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Thread: Best eyepiece to showcase Zambuto f/5 mirror?

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    Default Best eyepiece to showcase Zambuto f/5 mirror?



    I'll be taking delivery of my new 12.5" Portaball with Zambuto mirror, in the next few weeks. I'm curious what your opinions are on the best eyepiece would be (under dark sky) to showcase the optical quality of the mirror. Anybody out there with a Zambuto mirror that can attest to whether my eyepiece collection (see signature) is going to hold me back? Brands like Televue, Pentax, and Zeiss are of course the gold standard. But are the ES82 and ES100 eyepieces really close enough? What about my Baader Hyperion 24mm?

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    Default Re: Best eyepiece to showcase Zambuto f/5 mirror?

    I don't have a Zambuto mirror, wish I did, but I would expect the ES 82s and 100 to perform well. However, I would have doubts about the Hyperion. I've had a few of the Hyperions and they were soft in my fast scopes with very noticeable curvature at the edges.
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    Default Re: Best eyepiece to showcase Zambuto f/5 mirror?

    I have the 11 mm explore scientific. It performs very well . The entire field of view looks sharp and i dont see any curvatures. This is if course from my own perspective. More experienced users on this forum might notice things that i do not . I have also only used it on my f5 5 inch reflector

    Before i purchased this eyepiece , I spoke to Don from eyepiecesetc.com . I was comparing it with a televue eyepiece . He gave me the analogy that explore scientific eyepieces 82 is like a honda accord. A honda accord is a really good car !

    From what i have read on this forum, the 82 es 18 mm is a great eyepiece. I think it will perform great with your zambutto mirror for DSO
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    Default Re: Best eyepiece to showcase Zambuto f/5 mirror?

    Hi Paul!

    Give this thread a read: TV Nagler 22mm T4 vs ES 82 24mm

    I really enjoy what my ES 82°'s do for me. My targets of preference are galaxies. Using these eyepieces, I've logged just over 900 of them. My two favorites of the series are the 18mm and the 11mm, and are my galaxy hunter/killer team in my 12" f/5 dob.

    During a typical galaxy observing session, I run the gamut of the 18mm, 14mm, 11mm, and sometimes the 8.8mm. I even employ the 6.7mm on the really tough ones. The 8.8mm, 6.7mm, and the 4.7mm even get work on planets.

    I really like these eyepieces.

    Of course, the premium brands are premium...but the cost vs. quality should put the ES eyepiece in the running for consideration.
    Bryan

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    Default Re: Best eyepiece to showcase Zambuto f/5 mirror?

    I have to question the idea that a Zambuto mirror needs some special quality eyepiece to show it off. Eyepieces are fully half the optical system and one can see quality differences just fine as long as the objective is diffraction limited. On my Z12 I happily use TV Panoptics and Delos and when I want to go wide the ES100s. I had the Baader Hyperions. They were soft and I no longer have them. They were just fine in an f10 cat but couldn't handle my f5 Z12. For lunar/planetary the Delos are really close to being as good as Orthoscopics.
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    Default Re: Best eyepiece to showcase Zambuto f/5 mirror?

    I guess it is a truism that a telescope is only as good as the worst element in the optical path, hence I assume "showing off" the Zambuto mirror means getting the best quality eyepieces (within reason), so that they are as good as the mirror if possible, and don't degrade the overall view at all.

    Skaven, you might find that you will get a bit of coma with any eyepiece if the mirror is f5 or faster (I am not sure what yours is). If so, you might want to get a coma corrector to maximise the sharpness of the eyepieces. Of course the gold-standard is the TV Paracorr, but there are others out there by Baader and GSO etc. However, I use the ES 20mm 100-degree eyepiece in my f5 12" dob, and it has performed beautifully (without a coma corrector). I have compared it with the 21mm Ethos, and could find very little difference (perhaps slightly lower light transmission, and 5-10% less sharp right at the edges, but 90% of the field was effectively identical). From what I have read it seems the ES 82 and 100 eyepieces in general are very good, especially at their price level- and they don't give a great deal away to the Naglers etc. I have the ES 70 degree 25mm eyepiece (the one that was on super special about 12 months back), and it is pretty fuzzy at the edges, as I would expect for an eyepiece that only cost me about $40 delivered to Australia!

    When I was looking for a super-sharp mid-range eyepiece for my dob a number of years ago I tried the Hyperions, and even the TV 19mm Panoptic but ended up getting a TV Radian 18mm as the Hyperions (and the Panoptic! - long story...) were quite fuzzy towards the edge.

    Personally, I would be using the eyepieces you have already, and see if you can borrow some TV ones to see if you can pick the difference. You will find out pretty quickly if your 24mm Hyperion doesn't stack up to (say) the ES 30mm that you already have...

    Congrats on the new scope- and I am looking forward to hearing how it performs!

    All the best,

    Dean
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    Default Re: Best eyepiece to showcase Zambuto f/5 mirror?

    Quote Originally Posted by bladekeeper View Post
    Give this thread a read: TV Nagler 22mm T4 vs ES 82 24mm
    It's an interesting comparison. My experience as a former TV Nagler owner is that the T4s are a little eccentric compared to the T5s and T6s. They are not as good on lunar/planetary as the T5s and T6s and should be regarded (the T4s) as DSO specialty eps.

    I wonder whether the ES 82s are DSO specialists?
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    Default Re: Best eyepiece to showcase Zambuto f/5 mirror?

    Quote Originally Posted by mruhomau View Post
    I have the 11 mm explore scientific. It performs very well . The entire field of view looks sharp and i dont see any curvatures. This is if course from my own perspective. More experienced users on this forum might notice things that i do not . I have also only used it on my f5 5 inch reflector

    Before i purchased this eyepiece , I spoke to Don from eyepiecesetc.com . I was comparing it with a televue eyepiece . He gave me the analogy that explore scientific eyepieces 82 is like a honda accord. A honda accord is a really good car !

    From what i have read on this forum, the 82 es 18 mm is a great eyepiece. I think it will perform great with your zambutto mirror for DSO
    As I understand it, the Explore Scientific 82 and 100 degree series are lens-for-lens clones of the Nagler and Ethos lines, respectively. It wouldn't surprise me in the slightest to find that the 68 degree series is a clone of the Panoptic series. So from the perspective of "suitability" for fast scopes (spherical correction, in particular) I agree that my ES eyepieces will do just as well as Televue.

    What I'm more curious about is where the remaining differences are. As I understand it, Televue has their own proprietary coatings that Explore Scientific cannot duplicate. It's also possible that Televue has stricter quality control regarding the polish and prescription of the lenses that comprise their eyepieces. They do claim on their website that their lenses come from factories in Taiwan and Japan that do not make competitors' lenses. But do either of these make enough of a difference, compared to Explore Scientific, to be noticed?

    Moving from a Synta mirror to a Zambuto one, I'm expecting to notice three things:
    • Improved contrast due to a smoother polish and more accurate prescription
    • Sharper stars, enhanced details at focus (within the confines of the seeing)
    • Elimination of higher-order aberrations like astigmatism


    Of course, anything in the optical train (including the eyepiece) can (re)introduce these problems. I suppose this discussion comes down to -- will my eyepieces "hold me back" in any of these respects?

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    Default Re: Best eyepiece to showcase Zambuto f/5 mirror?

    Quote Originally Posted by skaven View Post
    As I understand it, the Explore Scientific 82 and 100 degree series are lens-for-lens clones of the Nagler and Ethos lines, respectively. It wouldn't surprise me in the slightest to find that the 68 degree series is a clone of the Panoptic series. So from the perspective of "suitability" for fast scopes (spherical correction, in particular) I agree that my ES eyepieces will do just as well as Televue.
    The red emphasis is my own.

    When considering Portaball scopes, Zambuto mirrors and Televue eyepieces, you're now shopping way, way above my pay grade.

    I did find the attached graphic buried deeply in my aging hard-drive. Perhaps it will be of some use to you.
    Attached Images Attached Images
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    Default Re: Best eyepiece to showcase Zambuto f/5 mirror?

    Quote Originally Posted by DeanD View Post
    I guess it is a truism that a telescope is only as good as the worst element in the optical path, hence I assume "showing off" the Zambuto mirror means getting the best quality eyepieces (within reason), so that they are as good as the mirror if possible, and don't degrade the overall view at all.
    Indeed!

    Quote Originally Posted by DeanD View Post
    Skaven, you might find that you will get a bit of coma with any eyepiece if the mirror is f5 or faster (I am not sure what yours is). If so, you might want to get a coma corrector to maximise the sharpness of the eyepieces. Of course the gold-standard is the TV Paracorr, but there are others out there by Baader and GSO etc. However, I use the ES 20mm 100-degree eyepiece in my f5 12" dob, and it has performed beautifully (without a coma corrector). I have compared it with the 21mm Ethos, and could find very little difference (perhaps slightly lower light transmission, and 5-10% less sharp right at the edges, but 90% of the field was effectively identical). From what I have read it seems the ES 82 and 100 eyepieces in general are very good, especially at their price level- and they don't give a great deal away to the Naglers etc. I have the ES 70 degree 25mm eyepiece (the one that was on super special about 12 months back), and it is pretty fuzzy at the edges, as I would expect for an eyepiece that only cost me about $40 delivered to Australia!
    My Synta mirror is a 10" f/4.7, and I actually have not found the coma to be particularly distracting. That said, I don't observe wide-field all that often -- generally I use my ES100-9mm or ES82-18mm, both of which only use the central portion of the image at the focal plane. I have a friend that has a Paracorr; I'm sure he'd let me try it out to see if it's worth the upgrade. He certainly feels it's a major improvement on his 12" Skywatcher dob.

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