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Thread: Eyepieces I would choose for my Infinity 80 if I could.

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    Default Eyepieces I would choose for my Infinity 80 if I could.



    I have been fiddling around a lot with eyepieces and my Infinity 80 while chasing Messier objects. So far, I have found 94 of them and stand a chance of finding every one, including the dimmer galaxies of the list, from my suburban back yard (dark red zone). (Never though this possible before now.)

    Possibly, the behavior of my vision and brain, with artificial lenses, etc. are having an effect, but I now have a reasonably good combination of eyepieces and Barlows. I got to thinking about what I would have, if I could just call in and order exactly the focal length, etc that I wanted. I am posting my thoughts, as least for your amusement. Possibly, what I envision is not realistic considering what is available, but I would pass it along, in case it can provide any food for thought.

    What would I want with eyepieces for the Infinity 80?

    1. Probably not terribly expensive, but would be willing to spend $50 each for most of the eyepieces in the list and maybe a little bit more for a larger one or two. (I spent this with the Vixen NPL eyepieces I bought, which seem to meet my eye needs exactly, but not a perfect selection of focal lengths. The focal length differences between what they had and what I would like started this thought process.)

    2. Would like at least 50 degree field of view, maybe a little more in the shorter focal lengths.

    3. Want a well illuminated field, all the way to the edge, with a good crisp black boundary.

    4. As good a type of coating as I could get for that price range with a neutral cast, (not yellow like Televue Plossles.)

    5. Nothing really weird going on out on the edges, but a little bit of field curvature is not objectionable.

    6. Parfocal characteristics are pretty important to me to keep me mentally focused from one eyepiece change to another.

    7. Would like a regular pattern of focal lengths that allow me to easily calculate magnifications and equivalent focal lengths in my head as I change from eyepiece to eyepiece using Barlows.

    8. Reasonably small size. The eye end can be larger than the field end of the eyepieces, but not massively so, in keeping with the size and weight of the scope.

    9. Stick with focal lengths that give at least a reasonable amount of eye relief, which for me and Plossles, seems to end at about 9mm. With shorter focal lengths, I tend to start tensing up, which is not good for long duration observing.

    The focal lengths that would be optimum for me with this scope fall into three groups of three, plus two Barlows.

    Group 1: Finding and wide field work:

    a. A good finder in the 30 to 32 degree range with as wide of a field as possible in 1.25 inch format. A 32mm with a real 50 degree AFOV would give a 4 degree TFOV with this scope.

    b. 25 or 26mm as an occasional eyepiece to fill the gap between the finder and a 20mm.

    c. 20mm seems to work out well for many galaxies or pairs of galaxies as well as other large objects.

    Group 2: Middle range for some globular clusters, open clusters, Jupiter, etc. This group also very important with the use of a Barlow for planetary, lunar, and double star viewing as needed. Steps are 2mm per eyepiece for 16mm, 14mm and 12mm focal lengths. With 2X Barlow they provide 8, 7, and 6mm equivalent focal lengths for double stars. With 4X Barlow, they provide 4, 3.5, and 3mm for lunar observing.

    Group 3: Finer eyepieces that provide the cutting edge for sensitive grey differences that allow some galaxies to be visible that are not at other magnifications. Using Barlows, they provide very fine magnification selections for lunar viewing under differing atmospheric conditions. The focal lengths are 11, 10, and 9mm. Used by themselves with no Barlow, they provide the ultimate finer points of magnification for getting the most contrast for a given object.

    The eyepiece range for me with galaxies is from 20mm down to 9mm, needing finer gradation as the focal length gets shorter. 9mm is the cutoff. Below that, with an 8mm eyepiece (or 50X), the objects simply disappears for me or becomes unintelligible to my mind, while some objects have their best view with a 9mm.

    These three eyepieces give the finest selection of magnifications for lunar viewing in the high magnification range for the Infinity 80. The equivalent focal lengths with the 4X Barlow are 2.75, 2.5, and 2.25 (or 145, 160, and 178X). Under most conditions, the 160X is as far as the scope will go. If the weather is a little off, the 2.75mm equivalent or 145X shows a little more information in the image and 160X is too much. Occasionally, the 9mm with the 4X Barlow can get the most detail. However, this is rare.

    The two Barlows, as have been referenced, that give a good consistent system of focal lengths with plenty of fine intervals where needed are 2X and 4X. I have a lot of different Barlows that I have tried with this scope. The one that
    consistently works the best for me and seems to give me the most light through-put and has a good field all the way to the edge with this f/5 refractor is my Siebert 4X self centering Barlow. I am not sure what Mr. Siebert is doing with his Barlows that is different from other people, but it is working for me with this scope. I plan on purchasing a 2X from Seibert to compliment th 4X as closely as I can.

    I do have scopes that are better than this one for planetary, lunar, or double star viewing. However, when I have this one out and I want to make some quick views of varied things, this little Infinity 80 does well enough that I will use it for those purposes rather than dragging out another scope.

    In summary, the eyepieces I would buy to go with this scope and a 2X/4X Barlow combination for a complete system are: 32, 26, 20, 16, 14, 12, 11, 10, and 9mm. If I had to do without one from each group it would be the 26, 14, and 11mm eyepieces.

    Well, that is probably enough rambling. I hope you are having a nice day!
    Last edited by MistrBadgr; 04-07-2017 at 08:33 PM.
    Bill Steen
    Sky Hunters' Haven Observatory, Broken Arrow, Oklahoma
    Meade LX 70 8R & 6M, Infinity 60, 80 & 102, Polaris 112, 127, & 130, DS 2102 OTA, DS 90 OTA, 60 mm f/15, Lightbridge 12, Lightbridge Mini 82, Eclipseview 76 & 114, Sky Shed 3 Bay POD, LPI-G Color

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    Default Re: Eyepieces I would choose for my Infinity 80 if I could.

    We seems to have a similar strategy. Except I like my TV Plossls . I don't seems to notice or don't have a yellow tint in TV Plossls, mine are later models though.

    When I go after really faint stuff I try to keep number of glass elements in the light path to minimum, so I don't use barlows or focal reducers for DSOs and if more complex EPs fail I switch to Orthos or PLossls as a last resort.

    Planets, moon and double stars is a different story, I find using good quality barlows very productive. In fact I sold my short FL EPs and bought more barlows instead .

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    Eagleheaf (04-07-2017)

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    Default Re: Eyepieces I would choose for my Infinity 80 if I could.

    As I read here in the forums these "Musings" from different folks here and there and I really appreciate being able to evesdrop.
    It is all FOOD FOR THOUGHT to me...and I have a very hungry mind. :-)
    Thank you MistrBadgr and Bigzmey.
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    Mark

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    Mounts for all.

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    Default Re: Eyepieces I would choose for my Infinity 80 if I could.

    Hi Bigzmey!

    I think you are right, we are running pretty parallel with eyepiece strategy. I am not using the Barlows for dim objects, as you say, to keep the amount of glass down. With this small scope I am using now, things seem to play out for galaxies at around 50X under my circumstances, so a Barlow is not necessary. The Barlows give me magnification range for brighter objects, up to the highest power the scope can handle with the Moon.

    I certainly have other eyepieces with more glass, but I am reserving those for larger scopes that have more light to waste. I need the wider FOV then to make up for the otherwise decreasing AFOV.

    I have a nice set of University Optics HD Orthos, from 25mm down to 4mm, that have been my goto eyepieces under trashy circumstances. With the change of lenses in my eyes, the vision rules I live with have changed and I am learning that other eyepieces, like these Vixen NPLs are working better for me now. I seem to need more field of view than I used to in order to make sense of the scene. The HD Orthos are still very good when I do double stars with a longer refractor, when it means more to have that little extra in resolution.
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    Bill Steen
    Sky Hunters' Haven Observatory, Broken Arrow, Oklahoma
    Meade LX 70 8R & 6M, Infinity 60, 80 & 102, Polaris 112, 127, & 130, DS 2102 OTA, DS 90 OTA, 60 mm f/15, Lightbridge 12, Lightbridge Mini 82, Eclipseview 76 & 114, Sky Shed 3 Bay POD, LPI-G Color

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    Default Re: Eyepieces I would choose for my Infinity 80 if I could.

    You seem to be getting some "pricey" suggestions, so let me take you in a different direction of thinking.
    1: "Finder Eyepiece" - 23mm "no name" Chinese Aspheric found all over eBay for $8 and change. It's soft at the edges, but that is not a problem for a finder and you are getting 62 degrees of field which is about the max for a 1.25" barrel, so you are "finding" at much higher magnification than a 30 or 32mm Plossl with the same field size. You'll miss a few super faint targets, but the added mag will give you darker backgrounds to pick out the things that you can see. It also saves you spending money on a "20" for your 20mm eyepiece.
    2: Spend most of your money on a good 13 to 16mm Ortho or Plossl that will give you crisp clean views for most of your targets.
    3: Higher power can be provided by the 13-16mm and the popular 1.5 barlow also found all over eBay or The 10mm $7 to $8 Chinese Aspheric. It is crappy at the edges - SO JUST IGNORE THE EDGES ! ! ! ! ! ! It is a 62 degree field eyepiece so just use the smeared outer field to make finding things easier and VIEW through the central 45 or 50 degrees that is as clear as any cheap Plossl or Ortho which only gives you 45 to 50 degrees of field. These aspherics only use three lenses so the throughput is excellent which is a BIG plus in a smaller aperture scope.
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    Default Re: Eyepieces I would choose for my Infinity 80 if I could.

    Hi Mark!

    You must have posted while I was responding to Bigzmey's post. You are most welcome.
    Bill Steen
    Sky Hunters' Haven Observatory, Broken Arrow, Oklahoma
    Meade LX 70 8R & 6M, Infinity 60, 80 & 102, Polaris 112, 127, & 130, DS 2102 OTA, DS 90 OTA, 60 mm f/15, Lightbridge 12, Lightbridge Mini 82, Eclipseview 76 & 114, Sky Shed 3 Bay POD, LPI-G Color

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    Default Re: Eyepieces I would choose for my Infinity 80 if I could.

    Hi Trombatissimo!

    I bought all three focal lengths of the aspheric eyepieces you mentioned. They do not play well with my little f/5 refractor and the new lenses in my eyes. I am going to try them out again in my 60mm f/15 scope the next time I have it out. They could work out nicely there.

    To get the best out of my little f/5 in this search for all the Messier object under suburban light pollution, and my eye situation, I have had to go a little more expensive with the eyepieces and have a lot of different focal lengths to get just the right combination to get the galaxies to show up from my back yard.
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    Bill Steen
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    Meade LX 70 8R & 6M, Infinity 60, 80 & 102, Polaris 112, 127, & 130, DS 2102 OTA, DS 90 OTA, 60 mm f/15, Lightbridge 12, Lightbridge Mini 82, Eclipseview 76 & 114, Sky Shed 3 Bay POD, LPI-G Color

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    Default Re: Eyepieces I would choose for my Infinity 80 if I could.

    Hello Bill,

    like you, I am also mostly observing under my backyard skies.

    My logbook statistics reveals, that the most used eyepiece to target the area of skies with an expected galaxy is the light-weight WO UWAN f=16mm 82° (true FOV 1.7°) magnification 47x and exit pupil 3.2mm
    This EP reveals already about 95% of galaxies within the reach of my 6" F/5 refractor.

    To go deeper (smaller and fainter objects), I am mostly using eyepieces close to f=10mm (exit pupil 2mm).
    For the larger low surface brightness galaxies I take the premium (unfortunately expensive) eyepieces with the exit pupil close to 4mm.

    Hoping this helps,

    JG
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    Default Re: Eyepieces I would choose for my Infinity 80 if I could.

    Thanks, JG!

    There seems to be lots of changes from time to time in what magnification works best. Yesterday morning, the best eyepiece was a 9mm Plossl for M80. This morning, with the Moon farther along and up a little bit earlier, the best one for M10, 12, and 14 was the 20mm. I could not find M9 or 19 with anything. Go figure!
    Bill Steen
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    Default Re: Eyepieces I would choose for my Infinity 80 if I could.

    Hello Bill,

    when the Moon is interfering, the the EP choice for the deep sky objects becomes difficult, o.k.
    Best,

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
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