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Thread: ES 68 degree 25mm or 82 degree 14mm?

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    Default ES 68 degree 25mm or 82 degree 14mm?



    I am about to upgrade my next eyepiece and am struggling as to which piece I should upgrade next. I will either replace my Orion Sirius 25mm Plossl or my Celestron 15mm (not sure what type, it came in the $50 kit). Having an Orion SkyQuest XT6, I am limited to 1.25" EP's, so I was looking at the Explore Scientific 68 degree 25mm and the 82 degree 14mm. If the 14mm with the expanded FOV is similar to my current 25mm (50 degree FOV), I would like to go that route but I do not have enough experience with all of this yet. Any suggestions or past experience with these two EP's would be great. Or, if there are similar/cheaper alternatives with similar quality please fill me in.

    Hopefully this is a little more specific than the normal what eyepiece should I get, but I'm still a newb!

    Thanks for your help.

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    Default Re: ES 68 degree 25mm or 82 degree 14mm?

    Sorry if I have picked you up wrong here, but, if you only have the two eyepieces, why not go for something to fill in a gap, rather than a direct replacement for one you already have?

    The 25mm gives 48 times magnification (48x), the 15mm, which I will assume is a plossl, will give 80x

    A 10mm eyepiece, whether a widefield or a plossl, will give 120X, and an 8mm 150x. I would go for something of this nature first of all.

    How about either the Explore Scientific 82 degree 11mm or the 8.8mm? Both superb eyepieces, and each less than $100 in the USA.

    You can replace the size's you already have later.
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    Default Re: ES 68 degree 25mm or 82 degree 14mm?

    The Orion Sirius 25mm plossl is not a bad EP. It also came with my XT10 and I used it quite often. I am a wide FOV nut and say go for the 82 degree EP's. If you got the ES 82 14mm EP, the magnification would be 85x with a TFOV (true field of view) of .96 degrees. Your 25mm gives you 48x and a TFOV of 1.08 degrees. So it would be like looking through your Celestron 15mm EP at 80x but with virtually the same TFOV as your 25mm. (the ES brand is much better quality) So basically, with the ES 14mm your getting higher magnification (bigger object) and a lot of space around the object like the 25mm. If you went with the 68 degree 24mm EP, it would give you 50x and a TFOV of 1.36 degrees. If you were to look at the ES 82 11mm, It would give you 109x and a TFOV of .75 degrees. I have noticed that younger people tend to like the wide FOV like the 82 degree series while the more seasoned astronomers like the 68 degree. Hope some of this was helpful.
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    Default Re: ES 68 degree 25mm or 82 degree 14mm?

    Quote Originally Posted by hal2000 View Post
    Sorry if I have picked you up wrong here, but, if you only have the two eyepieces, why not go for something to fill in a gap, rather than a direct replacement for one you already have?

    The 25mm gives 48 times magnification (48x), the 15mm, which I will assume is a plossl, will give 80x

    A 10mm eyepiece, whether a widefield or a plossl, will give 120X, and an 8mm 150x. I would go for something of this nature first of all.

    How about either the Explore Scientific 82 degree 11mm or the 8.8mm? Both superb eyepieces, and each less than $100 in the USA.

    You can replace the size's you already have later.
    Sorry, I do have more EP's. I have a 25, 15, 9, 6 and a x2 Barlow. I just upgraded the 9 mm with the ES 82 degree 8.8mm and was able to use it for the first time tonight. All I can say is WOW! It is a little cloudy in Phoenix but the city light reflection is horrible and I was still able to get fantastic views of Saturn when not hiding behind the clouds. Can't wait for a dark, clear night!

    I would like to start looking for/at some dso's so I want to make sure the ep's will suit my needs. I'm going to need to find a location with less light pollution. Is f8 aperture not going to allow for this?

    Also, it seems pretty tough to find the ES ep's. Are they on back order or something?

    I found a 70 degree 20mm ES ep, but it looks different than the 68 degree ep's. the ES website doesn't even list 70 degree ep's. I wonder if it is an older model. It isn't waterproof, which isn't a deal breaker to me. I just want to make sure the quality is as good. It's about half the price of the 68 degree ep's so I'm guessing its not as good.

    Now I'm rambling.

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    Default Re: ES 68 degree 25mm or 82 degree 14mm?

    The ES EP's are outstanding EP's. I've Gone ahead and sprung for the ES 100 degree EP's and holy cow! They are the best thing since sliced bread.
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    Default Re: ES 68 degree 25mm or 82 degree 14mm?

    My question is why the 9 mm 82 degree eyepiece...under higher power you just do not need or want an ultra wide angle view... UNLESS you have a difficult time keeping the object in the FOV since you are using a Dob...

    I would go with 82 degree eyepieces for MY low power needs in a heart beat BUT not for higher power viewing..

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    Default Re: ES 68 degree 25mm or 82 degree 14mm?

    Bob, the beauty of widefield eyepieces is that you can see the object set in its surroundings in space. This applies at higher powers as well. I just like to see this effect no matter what power I am using.

    I'm not right and you're not wrong, we all just have different perspectives on these things.
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    Default Re: ES 68 degree 25mm or 82 degree 14mm?

    Quote Originally Posted by hal2000 View Post
    Sorry if I have picked you up wrong here, but, if you only have the two eyepieces, why not go for something to fill in a gap, rather than a direct replacement for one you already have?

    The 25mm gives 48 times magnification (48x), the 15mm, which I will assume is a plossl, will give 80x

    A 10mm eyepiece, whether a widefield or a plossl, will give 120X, and an 8mm 150x. I would go for something of this nature first of all.

    How about either the Explore Scientific 82 degree 11mm or the 8.8mm? Both superb eyepieces, and each less than $100 in the USA.

    You can replace the size's you already have later.

    I too think this is the better way to go since you already have a 15mm and 25mm eyepiece. For the time being, rather than sorta duplicating what you already have, why not add to what you have......

    Good luck

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    Default Re: ES 68 degree 25mm or 82 degree 14mm?

    ES did make a 70* series awhile back; unfortunately, it was not just up to par with their other offerings and faded away...Wasn't a particularly bad eyepiece, just wasn't sharp to the edge.
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