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Thread: Possibly adding to my 2" EP collection - hoping to hear thoughts on a few EPs

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    Default Re: Possibly adding to my 2" EP collection - hoping to hear thoughts on a few EPs



    Quote Originally Posted by KeithBC View Post
    I have heard that the Q70 series does not perform too well in Newtonians. I can't vouch for that myself, but I have a couple of Antares W70 eyepieces which, I believe, are a similar optical design. And those, I can confirm, do not do well in Newts.

    Apparently, it has to do with field curvature. The Q70 and W70 expect a positive field curvature, whereas Newts have a negative field curvature. I am paraphrasing a post I read here a week or two ago.

    What I do know is that my W70s have absolutely terrible distortion around the edge of the FOV, and that a coma corrector reduces but does not remove the distortion.
    I have seen that the Q70s are an unhappy pairing with fast Newtonian scopes. I'm very happy with Panoptics (70 degree afovs) and the ES 100s. Waiting to get better quality is a long term rewarding strategy.
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  2. #12
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    Default Re: Possibly adding to my 2" EP collection - hoping to hear thoughts on a few EPs

    Quote Originally Posted by not_Fritz_Argelander View Post
    I have seen that the Q70s are an unhappy pairing with fast Newtonian scopes. I'm very happy with Panoptics (70 degree afovs) and the ES 100s. Waiting to get better quality is a long term rewarding strategy.
    I totally agree! I've made some poor decisions when it comes to eyepiece purchases. My Panoptics and my ES 100* are my favorites and well worth waiting for. However when I first started my collection I did purchase a University Optics UM20 80* eyepiece for about $139 that is impressive! Well worth the price and it would be hard for me to let it go because it performs like a much higher priced eyepiece. Maybe someone else has had some experience with University Optics?
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    Default Re: Possibly adding to my 2" EP collection - hoping to hear thoughts on a few EPs

    Quote Originally Posted by 10538 View Post
    I totally agree! I've made some poor decisions when it comes to eyepiece purchases. My Panoptics and my ES 100* are my favorites and well worth waiting for. However when I first started my collection I did purchase a University Optics UM20 80* eyepiece for about $139 that is impressive! Well worth the price and it would be hard for me to let it go because it performs like a much higher priced eyepiece. Maybe someone else has had some experience with University Optics?
    UO has sold several different eyepiece designs. Unfortunately they no longer sell the MK70 lineup. I had the 25 and 40 mm fls and they were terrific bargain performers especially in scopes slower than f7. They were soft at the edges at f5 or faster. I'm not familiar with their current versions though directly but the design of their current offering is similar to the ones being discussed.
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    Default Re: Possibly adding to my 2" EP collection - hoping to hear thoughts on a few EPs

    Thanks for everyone's sage advice and input. I'll definitely look into the suggestions provided, but at the end of the day you're probably right to wait and invest in the better ES series of EPs.
    Scopes: Stellarvue SV70T w FF/FR @ 0.8x; ES 127 CF FCD100 w FF/FR @ 0.7x;
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    EPs: ES82° 8.8&30mm; ES68° 24mm; Meade UWA 82° 5.5&14mm; Meade 52° 56mm; Binos: 15x70
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    Default Re: Possibly adding to my 2" EP collection - hoping to hear thoughts on a few EPs

    Quick follow-up question regarding the potential purchase of an ES68° 40mm EP. According to my calculations that would give me a TFoV of 2.27 along with an exit pupil of 8.51 and 30x magnification. Is that too much exit pupil and would I be exceeding the minimum magnificiation for the XT10g?

    Would I be better served with an ES68° 34mm which would deliver a TFoV of 1.93 with an exit pupil of 7.23 and magnification of 35.3x or an ES82° 30mm with 2.05/6.38/40x?
    Scopes: Stellarvue SV70T w FF/FR @ 0.8x; ES 127 CF FCD100 w FF/FR @ 0.7x;
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    Default Re: Possibly adding to my 2" EP collection - hoping to hear thoughts on a few EPs

    That would definitely exceed the exit pupil and you will start to see the shadow of the secondary. You might even be pushing it with the ES 34mm 68. In my AD12 the ES 30mm 82 is very wide, but because of the exit pupils, the ES 24mm 82 works better for detailed observing.
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    Default Re: Possibly adding to my 2" EP collection - hoping to hear thoughts on a few EPs

    Quote Originally Posted by Reddog1972 View Post
    Quick follow-up question regarding the potential purchase of an ES68° 40mm EP. According to my calculations that would give me a TFoV of 2.27 along with an exit pupil of 8.51 and 30x magnification. Is that too much exit pupil and would I be exceeding the minimum magnificiation for the XT10g?

    Would I be better served with an ES68° 34mm which would deliver a TFoV of 1.93 with an exit pupil of 7.23 and magnification of 35.3x or an ES82° 30mm with 2.05/6.38/40x?
    How large is your fully dilated pupil? I'm pretty sure I cannot dilate past 5-6 mm. It depends on age.
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    Default Re: Possibly adding to my 2" EP collection - hoping to hear thoughts on a few EPs

    I'm unsure of the exact size of my fully dilated pupil, but I'm 44 years old and I don't wear glasses if that helps.
    Scopes: Stellarvue SV70T w FF/FR @ 0.8x; ES 127 CF FCD100 w FF/FR @ 0.7x;
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    Default Re: Possibly adding to my 2" EP collection - hoping to hear thoughts on a few EPs

    Quote Originally Posted by Reddog1972 View Post
    I'm unsure of the exact size of my fully dilated pupil, but I'm 44 years old and I don't wear glasses if that helps.
    You might likely be able to handle 6-6.5 mm for the next 10 years. Needing glasses (or not) doesn't matter.

    You can measure your own exit pupil if you have a set of metric Allen wrenches.

    Your eye doctor can measure your fully dark-adapted entrance pupil for you, but you can also determine it for yourself. To do so, you’ll need a set of metric Allen wrenches. Allow yourself to become fully dark adapted, which may take half an hour or more. Look directly at a bright star, and hold one of the smaller metric Allen wrenches along your cheek so that the long portion crosses your eye parallel to and near the eyeball, as shown in Figure 1-4. Move the wrench up and down until it is centered on your pupil. You’ll see the star split into two stars, one on each side of the wrench. Substitute larger Allen wrenches until you reach a point where the star no longer splits, but is visible only as a single star on one side or the other of the Allen wrench. The size of that Allen wrench is the size of your fully dark-adapted entrance pupil.
    This is from an invaluable book Astronomy Hacks.

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    Default Re: Possibly adding to my 2" EP collection - hoping to hear thoughts on a few EPs

    I know you think the ES line is expensive, but it is an eyepiece you will only buy once and can happily use with just about any scope. If you spend the money on a cheaper eyepiece, you may find the view unsatisfactory and then you wind up spending more money to replace it. My advice would be to save up for the better eyepiece or try and find what you want on the used market. There are a lot of good deals if you have the patience for it.
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