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Thread: Would like someone to look over my eyepiece choices

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    Default Would like someone to look over my eyepiece choices



    Hello all, my name is Tristan and I'm new here. I recently purchased a Orion SkyView 6 Deluxe EQ from a second hand shop, it came with a 5mm Orion Ultrascopic Ep, and a Orion AstroTrack Drive. The 5mm EP is a bit tricky to use but I did get to see Jupiter and its 4 moons the other night! I could see very faint color it was amazing. Back on track now, I have had some help from /r/telescopes and they all have been a great help in my choices. Here is a google doc containing all the ep's and accessories I plan on purchasing. Any suggestions before I purchase?

    Thanks!!

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    Default Re: Would like someone to look over my eyepiece choices

    Hello and welcome Tristan
    I looked at your chart and here are my thoughts.

    The eyepiece focal lengths are a good choice but they make a barlow redundant as it will be doubling up on the magnifications you will have.
    The 26mm will become a 13mm (you will have a 15mm), 15mm becomes a 7.5mm (you will have a 6mm),etc
    The colour filter kit are very poor quality, a UHC or OIII filter would be handier if you are wanting to look at nebula.

    The collimating cap or Cheshire eyepiece should be one of the first purchases to help keep the telescope mirrors aligned.

    Enjoy the reflector, it will show you a lot
    Here is something to read on picking different eyepiece focal lengths: Article: What Astronomy Eyepieces should I get for my Telescope?
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    Default Re: Would like someone to look over my eyepiece choices

    Welcome to the forum, Tristan.

    Suggestions?

    That's what we call a "fast scope" with a focal ratio of f/5. Remember that number as it will be your guide with many, many purchases.

    Fast scopes are very twitchy to a good collimation. I advise your first purchase from the list be the collimation eyepiece.

    Now, back to that magic number. There is a tried-and-true rule of thumb in astronomy that goes something like this: As magnification increases (spell that eyepiece focal lengths get shorter), surface brightness decreases. The "optimum" blend of magnification and brightness is achieved with an eyepiece with a focal length approximately equal to two times the scope's focal ratio (there's that 5 again).

    With that in mind, the 4mm eyepiece on your list is a waste of money on just about everything except very bright planets and the moon.

    The 9mm eyepiece on your list "fits" the rule of thumb quite well, and will be fine.

    Sooner or later, you're going to tire of looking at the moon and planets and be ready for some deep space stuff. That's when the 26mm and 15mm eyepieces on your list are going to come in very handy.

    Remember this too... Seeing & Transparency have a great deal to do with success. When you're using an eyepiece that is anywhere near the focal ratio of your scope, the conditions will have to be very good to experience success. Even a 9mm will fall short of expectations on a "bad" night, at which point you'll want to either quit and go inside or put the 15mm eyepiece in the holder.

    That's all I have.

    Just have fun. The hardest thing for new folks to grasp is that this game is not about magnification. It's about gathering photons, especially with deep space objects.

    Clear, Dark Skies
    John (Urban Astronomer)
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    Default Re: Would like someone to look over my eyepiece choices

    Hello Tristan.
    Welcome to the forum.
    Enjoy your scope.
    Clear skies.
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    Peter.

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    Default Re: Would like someone to look over my eyepiece choices

    Yep! What they said. BTW the Orion Ultrascopic that came with the scope is quite a nice eyepiece. I don't think you need to worry about getting a 6mm now or a 4mm later. The 5mm should do for a while.

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    Default Re: Would like someone to look over my eyepiece choices

    Welcome to the forum Tristan. As others indicated you scope is fast (F5) and because of that is sensitive to the EP quality. Some of EPs you selected will be a poor match.

    Instead of getting a few budget EPs of eBay I would suggest to get one better quality EP and better quality barlow from a known source.

    If you buy Meade 26mm Plossl

    https://agenaastro.com/meade-series-...-eyepiece.html

    and GSO 2x/1.5x barlow

    https://agenaastro.com/gso-1-25-2x-a...rlow-lens.html

    Including 5mm EP you already have it will give you:

    5mm, 13mm, 17mm and 26mm options

    Enough to cover variety of targets from planets and Moon to DSOs.

    Don't worry about filters for now. Cheap color filters are not good, and good filters are expensive.

    Maybe just polarizing filter for Moon.

    https://agenaastro.com/bst-1-25-vari...ng-filter.html

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    Default Re: Would like someone to look over my eyepiece choices

    Welcome to the forum Tristan! Enjoy your new scope.
    Ted LeRoy
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    Default Re: Would like someone to look over my eyepiece choices

    All the advice above sounds good to me, but following from John's comments about a 10mm eyepiece, I wonder if instead of Bigzmey's suggestion of the polarising filter you get the 9.7mm Meade plossl (https://agenaastro.com/meade-series-...-eyepiece.html) to go with the 26mm and the barlow he suggested... A possible problem with the 9.7mm though is a fairly small eye-relief, so if you wear glasses you might be better off looking for something like the Long Perng 9mm LER (see: E9L-A Long Eyerelief Eyepiece(celestial) / Products / Long Perng Co., Ltd. - sold also under Orion name , and Skywatcher I think (eg: https://www.teleskop-express.de/shop...ye-Relief.html )

    Personally I have never bothered with a polarising filter on the moon, even with my 12" scope. But I do have to put up for a while with being night-blind in the eye I was using though!

    All the best, and good luck as you get into the hobby. Wellcome to the dark side...

    - Dean
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    Default Re: Would like someone to look over my eyepiece choices

    Quote Originally Posted by DeanD View Post
    Personally I have never bothered with a polarising filter on the moon, even with my 12" scope. But I do have to put up for a while with being night-blind in the eye I was using though!
    Ugh I tried that once, never again. Not only did I have to put up with being night blind, I saw the moon laughing, even in my sleep. Polarizing filter from then on, not just for the moon, but it helps bring out Venus' crescent shape also.
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    Default Re: Would like someone to look over my eyepiece choices

    Hello Tristan and Welcome to the Forums!
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