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Thread: Strategy for eye piece purchases

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    Question Strategy for eye piece purchases



    Hello!

    In possession of a Star Discovery-150P (1.25") and trying to figure out how to plan for complementing eye pieces over time.

    The scope came with a 10mm and 25mm eye piece and as I can see either I go with a Baader Hyperion Zoom 8-24mm but unless I am mistaken it has a smaller AFOV than buying separate eye pieces. The other alternative is looking at buying eye pieces something in the order of Baader Morpheus 76° 17.5mm, Baader Hyperion Aspheric 76° 36mm and then finally replacing my 10mm with a superior quality one, either another Baader Morpheus 76° or a Scientific Explore at around 8-12mm. A couple of questions regarding this.

    1. Will I miss the superior AFOV a lot if I go cheap with the zoom alternative?

    2. How do I find the best place to buy these and when are there sales? So far I have been looking at Greenwich webshop who are shipping to Sweden.

    3. Any obvious mistakes in my plans so far?

    /Eskil

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    Default Re: Strategy for eye piece purchases

    The 17.5mm Baader Morpheus is not available yet and is delayed quite a bit afaik.

    The Baader 36mm Hyp. Aspheric is terrible at f/5.

    The two above eyepieces are also 2" although they come with a 1.25" adapter so you can't get the entire 72 degrees view at 36mm with the Aspheric and the outer portion will be vignetted. The field stop of 23.55mm the 17.5mm Morpheus suggests that would not not be a problem though so one wonders why it comes as 2" with an adapter

    At f/5 and 1.25" I would recommend the 20mm ES68 or the 24mm ES68. These are corrected reasonably well at f/5 (just a touch out at the edge but not bad indeed. The 24mm at 68 degrees will give you the widest view possible with your scope. I would suggest the 11mm ES82 as well as this really is a very good quality eyepiece for the money. That would be all you need for the time being.

    Sorry, don't have experience with zooms. I think the AFOV is a touch limiting especially if you have scope capable of wide field views...

    There's a few shops in the UK that will export. First Light Optics is another with good prices and great service - I heartily recommend them. Greenwich I've not dealt with but they are very well known so I'm sure you can buy with confidence.
    Last edited by Davesellars; 06-06-2017 at 10:10 AM.
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    Default Re: Strategy for eye piece purchases

    Hi Eskil,

    Some good advice there from Dave. I have an f5 scope and a motley collection of eyepieces. Over the years I have picked up second-hand ones and waited for sales...
    It sounds like the two you have are fine to get you started: in fact I saw a review here that is very positive about your scope and the eyepieces: Sky-Watcher Star Discovery 150P Go-To reflector Review | BBC Sky at Night Magazine
    There is a German dealer that I have often seen recommended that you might want to check out: http://www.apm-telescopes.de/en/eyepieces.html They have a great range of makes and models.

    A good place for discussion about eyepieces in general is the Televue one: Tele Vue Optics: Advice in particular have a look at Al Naglers articles on choosing eyepieces. He is obviously trying to sell Televue ones, but there is a lot of "generic" advice too about types, field of view etc.

    I tried the Hyperion eyepieces for my scope when I was looking for something around 20mm fl, but ended up with the Televue 18mm Radian instead because it gave a sharp image right across the field, unlike the Hyperion. My TV13mm Nagler also does this in my f5 scope (exactly the same field as the 18mm Radian, but at higher power!), and I suspect the ES 82 degree eyepieces will do likewise (or very close). Certainly the ES 20mm 100degree eyepieces works very well in my scope. The biggest true field of view you can get for a 1 1/4" focuser is with an eyepiece with a field stop of 27mm, such as a 32mm Plossl (or the 24mm ES68 that is mentioned above).

    The zoom eyepieces, such as the Baader that you mention, are very good, but they give a wider field at high power, and a relatively narrow field at low power: so if you want a wide, low power fov you are better off with a fixed eyepiece. (Unless you want to go for the Leica zoom, but that is several times the price of your telescope!!! http://www.apm-telescopes.de/en/eyep...sph.-1.25.html )

    All the best,

    Dean
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    Default Re: Strategy for eye piece purchases

    I'd disagree that the 36mm Baader aspheric is terrible at f5. It is soft at theater edge but it is usable as a finder eyepiece on my Z12 Dob. In general unless your eye dilates fully to 7mm it stops down the aperture of your scope since light will get wasted. It is a 2" eyepiece, though and isn't usable in a 1.25" focuser unless you use the adapter which limits the field of view to 2/3 of the 70 degree FOV! So you wind up, in your scope, with only 46 degree AFOV. So the fuzzy part of the FOV is cut out but you no longer have a wide field view. In the end, it's not going to meet your needs.

    The only ES eyepieces I have are 2" ES100 series with which I'm quite happy. So I cannot comment in detail about the 68 degree and 82 degree AFOV series. I'm surprised that some have remarked the 68s might be a little soft at the edge.

    At f5 my preferred choices are the Televue Panoptic and Delos series at 70 degree AFOV. They are sharp to the edge.
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    Default Re: Strategy for eye piece purchases

    NFA: I wonder if this is down to field curvature. With my f/5 120ST it was plagued by many seagulls and soft as well from the outer 1/3rd. It is possible the curvature of the scope was adding to curvature of the EP in this case. However, this eyepiece performed pretty poorly with my C8 at f/6.3 as well. It did fine at f/7.5 with my 80ED and 120ED and the C8 at f/10.

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    Default Re: Strategy for eye piece purchases

    Quote Originally Posted by Davesellars View Post
    NFA: I wonder if this is down to field curvature. With my f/5 120ST it was plagued by many seagulls and soft as well from the outer 1/3rd. It is possible the curvature of the scope was adding to curvature of the EP in this case. However, this eyepiece performed pretty poorly with my C8 at f/6.3 as well. It did fine at f/7.5 with my 80ED and 120ED and the C8 at f/10.
    It could well be an issue with field curvature rather than correction of a fast light cone. I used it in my f10 9.25 Edge 2350 focus satisfactorily and in my f5 Z12 which at 1500mm focus has relatively little curvature compared to a 80mm f5 scope. Never tried it with anything smaller. Given your experience it must be a curvature issue that migh extend to the OPs scope. Of course in a 1.25" focuser a lot of fov disappears but so does the curvature problem, maybe. Not an eyepiece for the OP's purposes in any event!
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    Default Re: Strategy for eye piece purchases

    Thank you very much for all the thoughts regarding this. Seems I have to rethink a bit. As I said, and DeanD noted, I am happy with my scope and my eye pieces at the moment so I am in no rush to purchase anything yet.

    If I summarize.

    1. Below 14mm Explore Scientific delivers excellent value for money. If I have the extra money to spend I should look for Tele Vue eye pieces.
    2. Eye pieces branded as 1.25"/2" means my 1.25" focuser will deliver a trimmed FOV and I should rather look for 1.25" eye pieces.
    3. The Zoom eye pieces generally delivers limited FOV compared to dedicated eye pieces.

    Is this a correct summary?

    I guess this means I might instead wait for a sale on Explore Scientific and perhaps pick up a 82° 14mm and maybe the 8.8mm or 6.7mm. Perhaps later on pick up the 68° 24mm but no hurry at the moment.

    If I want a low power eye piece, how are the GSO Super Plossl series? I seem to be able to find them rather cheap with both 32mm and 40mm and 52° for a 1.25" focuser. Considering they are rather cheap, do they deliver anything I would be happy with? The 40mm lets me view the entire Andromeda Galaxy in one view according to Sky Safari. Still haven't been able to find that one in my back yard. Seems I need darker skies..

    /Eskil

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    Default Re: Strategy for eye piece purchases

    Quote Originally Posted by Davesellars View Post
    NFA: I wonder if this is down to field curvature. With my f/5 120ST it was plagued by many seagulls and soft as well from the outer 1/3rd. It is possible the curvature of the scope was adding to curvature of the EP in this case. However, this eyepiece performed pretty poorly with my C8 at f/6.3 as well. It did fine at f/7.5 with my 80ED and 120ED and the C8 at f/10.
    I am with nFA on this one. I love performance of Baader Aspheric 36mm in C8 at F10 and Baader Aspheric 31mm in my 120ST F5. I don't see any seagulls. I never tried 36mm in 120ST since it produces exit pupil over 7mm, but I will try next time and see if it will match your experience.

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    Default Re: Strategy for eye piece purchases

    Quote Originally Posted by Eskil View Post
    Thank you very much for all the thoughts regarding this. Seems I have to rethink a bit. As I said, and DeanD noted, I am happy with my scope and my eye pieces at the moment so I am in no rush to purchase anything yet.

    If I summarize.

    1. Below 14mm Explore Scientific delivers excellent value for money. If I have the extra money to spend I should look for Tele Vue eye pieces.
    2. Eye pieces branded as 1.25"/2" means my 1.25" focuser will deliver a trimmed FOV and I should rather look for 1.25" eye pieces.
    3. The Zoom eye pieces generally delivers limited FOV compared to dedicated eye pieces.

    Is this a correct summary?

    I guess this means I might instead wait for a sale on Explore Scientific and perhaps pick up a 82° 14mm and maybe the 8.8mm or 6.7mm. Perhaps later on pick up the 68° 24mm but no hurry at the moment.

    If I want a low power eye piece, how are the GSO Super Plossl series? I seem to be able to find them rather cheap with both 32mm and 40mm and 52° for a 1.25" focuser. Considering they are rather cheap, do they deliver anything I would be happy with? The 40mm lets me view the entire Andromeda Galaxy in one view according to Sky Safari. Still haven't been able to find that one in my back yard. Seems I need darker skies..

    /Eskil
    Hi Eskil
    I believe going with ES 68 and 82 would be a safe bet since these are good quality EPs and there is a lot of positive feedback from people using them in fast reflectors like yours.

    You should avoid using 2" EPs in 1.25" focuser and ES 68 24mm will serve nicely as a wide field EP in your scope.

    Best application for zoom EPs are bright targets like planets and moon, if you are after faint targets like DSOs I would invest in dedicated EPs.

    Good quality Plossls are well performing EPs and there is a good feedback on forums on GSO Plossls. 32mm Plossl will be better match for your scope than 40mm. They both have the same AFV, but 40mm will result in exit pupil of 8mm so some of light will be wasted.
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    Default Re: Strategy for eye piece purchases

    Quote Originally Posted by Eskil View Post
    Thank you very much for all the thoughts regarding this. Seems I have to rethink a bit. As I said, and DeanD noted, I am happy with my scope and my eye pieces at the moment so I am in no rush to purchase anything yet.

    If I summarize.

    1. Below 14mm Explore Scientific delivers excellent value for money. If I have the extra money to spend I should look for Tele Vue eye pieces.
    Try the TV before you buy. To me and some others they are worth the money. To others not.

    2. Eye pieces branded as 1.25"/2" means my 1.25" focuser will deliver a trimmed FOV and I should rather look for 1.25" eye pieces.
    Yep!

    3. The Zoom eye pieces generally delivers limited FOV compared to dedicated eye pieces.
    With the maximum FOV occurring at the max magnification!

    Is this a correct summary?
    Yes, as noted.


    I guess this means I might instead wait for a sale on Explore Scientific and perhaps pick up a 82° 14mm and maybe the 8.8mm or 6.7mm. Perhaps later on pick up the 68° 24mm but no hurry at the moment.

    If I want a low power eye piece, how are the GSO Super Plossl series? I seem to be able to find them rather cheap with both 32mm and 40mm and 52° for a 1.25" focuser. Considering they are rather cheap, do they deliver anything I would be happy with? The 40mm lets me view the entire Andromeda Galaxy in one view according to Sky Safari. Still haven't been able to find that one in my back yard. Seems I need darker skies..
    GSO Super Plossl? Or Super View?

    For Andromeda in one view binoculars might be better.....

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