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Thread: Best High Power EP for 10" Dob

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    Default Best High Power EP for 10" Dob



    Hi Everyone!

    Ive got a 10" Dob, just wondering what the bess high power EP would be. I have a 10mm Orion Plossl, with a barlow, but would a 4mm EP work then barlow to give 2mm.

    I saw Jupiter the other night through the 10mm Plossl, and the detail on the planet wasnt great so I am wondering what is the best magnification that I could get.

    Thanks,
    StarBiker
    Matt
    Orion XT10 Intellescope, 25 and 10mm Orion Plossl, Skywatcher 2x Barlow. New to this thing!

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    Default Re: Best High Power EP for 10" Dob

    The best magnification will depend very much on the seeing conditions, especially for planets. You need a steady atmosphere for high magnification viewing of planets. Very often, the best views will be obtained when it is slightly misty.

    I have a 4.7mm Explore Scientific 82 degree, and it works fine on those fairly rare nights when conditions allow its use. I had the loan of a 3-6mm Televue zoom a while ago, but only got a chance to use it once. The image was blurred at 3mm and not great at 4mm, and also, the planet flew through the field of view very quickly. But the views with 5 and 6mm were quite good.
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    Thumbs up Re: Best High Power EP for 10" Dob

    televue or what i got explore scientific,here's a link.TeleVue Ethos Eyepieces
    you can get or see the ES /EP'S & others in the link.:

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    Default Re: Best High Power EP for 10" Dob

    Well I'm more then willing to bet that you will sooner or later discover that you will end up spending most of your money on medium to low powered eyepieces rather then high (and especially very high magnification eyepieces) ...Main reason is the atmosphere surrounding Earth is just not going to allow you to push any scope up to much over 300 - 400x even on the best of nights (like one night every year or 2) ..

    a 4 mm eyepiece will give you 400x...barlow that eyepiece will give you 800x... BOTH figures are just unrealistic ... I view planets anywhere between 120x and and 200x for the most part...no matter what scope I happen to be using on any particular night... With your scope I would use a 6 mm at most to view planets... and to be frank since I am much more into DSO's I'd most likely buy a 12 mm to be able to barlow it on the nights the sky will allow me to .. I dont think you could barlow your 10 mm to effectively achieve 240x all that often many nights either...

    Bob G.
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    Default Re: Best High Power EP for 10" Dob

    I've always heard that a good rule of thumb for magnification is to not go any higher than the focal ratio of your scope. I have a 10" dob also and i won't go any higher than 4.5mm. The focal ratio on my scope is f/4.7 and I have a 9mm EP which i barlow to 4.5mm. I can't use it all the time cause sometimes you just can't do it, the atmosphere just won't let you do it. Its hard to get good magnification with a standard plossl in a f/4.7 scope like mine. Getting a better quality EP would do a whole lot better. I bought an Orion plossl kit with 5 EP's in it with a 6.3mm as my highest mag EP. I rarely ever used it cause it just doesn't work well in my fast scope. I got the ES 100 degree 9mm EP and at 133x I could see great detail when observing Jupiter. The color bands were clearly visible along with 4 of the moons. When I barlow the 9mm to a 4.5mm, I can see the big red spot if it is visible but it has to be a very clear night to go up to 266x. Hope this helps.
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    Default Re: Best High Power EP for 10" Dob

    StarBiker, I've got a Z10 and for the answer to your ? SADA said it , I've got a Nagler 3-6mm zoom and it's amazing but, there's always a but when talking about magnification.I don't just use it for planetary viewing I also use it on DSO's looking at cores and such.I don't need to barlow any object unless I just want to see what it will do and I only did that once but,the GODS were with me and I logged it and you can check my posts in the groups I'm in.Tele Vue 3-6mm Nagler and TV Paracorr.Keep your eye to the sky
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    Default Re: Best High Power EP for 10" Dob

    Hi Starbiker,

    It's not really feasible to give you a good answer without knowing the focal ratio of your scope. Aim for an exit pupil of around 1 mm for planetary views on a reasonably good night. The eyepiece to choose for any desired exit pupil can be found by the equation FE = EP * F, where FE is the focal length of the eyepiece, EP is the desired exit pupil, and F is the focal ratio of your scope. On really great nights with perfect seeing you might aim for an exit pupil of around 0.5 or so, but 1 mm is more often feasible, hence rcagle44's advice to not go smaller than the F ratio of your scope, which equates to a 1 mm exit pupil. Have a look at the wiki on eyepiece selection.

    Kind regards,
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    Default Re: Best High Power EP for 10" Dob

    In my 10XTi, f4.7, I rarely use the 6.7mm and below due to weather. The 6.7mm when the weather is good, is a fantastic eyepiece, and I recommend having it; the 4.7 though, you will only very rarely use it; if funds are limited, I'd get the ES 82* 8.8 or 11mm. Both will barlow fine (the 8.8 obviously very, very rarely barlows due to weather), and the 11mm is a fine eyepiece.
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    Default Re: Best High Power EP for 10" Dob

    Yea on my 10" dob I have on occasion barlowed my 9mm for a 4.5, and I have used a 5mm on it. But most nights I barlow my ES 14mm to get the best seeing on planetary. So I would say if your going to buy a dedicated EP for high mag planetary that will actually get used, I would go around a 6-7mm. Or since you only own a 10 and 25mm you need a EP or two that is between those, you can do what I did..buy a 14mm and barlow it. The 14mm gives great views of most DSO and then you will be able to have a good planetary EP also.
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    Default Re: Best High Power EP for 10" Dob

    Quote Originally Posted by StarBiker View Post
    Hi Everyone!

    Ive got a 10" Dob, just wondering what the bess high power EP would be. I have a 10mm Orion Plossl, with a barlow, but would a 4mm EP work then barlow to give 2mm.

    I saw Jupiter the other night through the 10mm Plossl, and the detail on the planet wasnt great so I am wondering what is the best magnification that I could get.

    Thanks,
    StarBiker
    Like was said, in most cases of viewing except that 1 night per year, the higher magnification will give you a bigger object, but without better resolution. It's usually bigger but dimmer and blurrier.

    When I started I only wanted bigger, but like Bob said, I moved to lower power eyepieces.
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