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Thread: Is the 30mm es82 eyepiece a good choice for my scope?

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    Default Is the 30mm es82 eyepiece a good choice for my scope?



    I have an 8 inch Orion dob. It has an f/5 ration and 1200mm focal length. I own the 24mm es68 and the 14mm es82, but I wanted something lower power with a wider fov. This will be my dso finder eyepiece as well as one to view the large dso's. I currently have the orion deepview 28mm and absolutely hate it!

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    Default Re: Is the 30mm es82 eyepiece a good choice for my scope?

    Well, it's a great eyepiece. In your scope it should yield an exit pupil of around 7.5mm. Being a younger fellow, your pupil will likely dilate pretty close to that, but you may see a bit of a soft dark splotch in the center of the FOV on brighter objects like the Moon (shadow of the secondary mirror).

    This helps explain some of these concepts: A Pupil Primer - Sky & Telescope

    It's a big eyepiece and will require a counter weight on the other end of your scope...

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    Default Re: Is the 30mm es82 eyepiece a good choice for my scope?

    I knew it was big, but not that big! I am still interested in it, how bad is the dark spot? It wouldn't effect the brightness of things like m42 or m31 would it?
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    Default Re: Is the 30mm es82 eyepiece a good choice for my scope?

    Quote Originally Posted by cjjacobs97 View Post
    I knew it was big, but not that big! I am still interested in it, how bad is the dark spot? It wouldn't effect the brightness of things like m42 or m31 would it?
    The dark splotch (shadow of the secondary mirror) is not bad. This really depends on how widely your dark adapted pupil can open. Being young, yours may well exceed the exit pupil of this eyepiece in your scope and you may never see it. But if you do, again, it will likely only show up on the very bright stuff. With M42 or M31, you'll never see it at all.

    If you don't see it with your 28mm, probably won't see it with the 30mm either.
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    Default Re: Is the 30mm es82 eyepiece a good choice for my scope?

    I have not seen it with my 28mm, but I will look for it next time I view the moon. That is good to know about m31 and m32, I will just have to figure out how to counter weight it!
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    Default Re: Is the 30mm es82 eyepiece a good choice for my scope?

    Quote Originally Posted by cjjacobs97 View Post
    I have not seen it with my 28mm, but I will look for it next time I view the moon. That is good to know about m31 and m32, I will just have to figure out how to counter weight it!
    There are varying methods for counter-weighting. I use welding magnets:





    And these work well unless I get below about 30° in altitude with either the 24mm or 30mm. I have a 1.5 lb. ankle weight I can place on top of the magnets for a little extra.

    Lot's of counterweight options out there.
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    Default Re: Is the 30mm es82 eyepiece a good choice for my scope?

    My scope has tension adjustment nobs so maybe that will help and keep it a little more stable if I tighten them all the way too.

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    Default Re: Is the 30mm es82 eyepiece a good choice for my scope?

    All the top quality wide FOV eyepieces are enormous. On a dobsonian scope, I find them to be the most valuable and useful eyepieces, too. Of course they are great for looking at big objects like the veil nebula and Andromeda. More importantly, they make target finding SO much easier. I've heard the ES 82 is excellent and I wouldn't hesitate to get one.
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    Default Re: Is the 30mm es82 eyepiece a good choice for my scope?

    Quote Originally Posted by cjjacobs97 View Post
    I have an 8 inch Orion dob. It has an f/5 ration and 1200mm focal length.
    That's impossible. A 8" f/5 Dob should have focal length of 1000mm. I don't see 8" Dob like this at Orion. My guess is that, most probably, you have a 8" f/6 (listed as f/5.9) Orion Dob.
    Zhumell Z8 8" f/6 Dob; Meade 2090 90mm Achromat.
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    Default Re: Is the 30mm es82 eyepiece a good choice for my scope?

    Quote Originally Posted by bladekeeper View Post
    Well, it's a great eyepiece. In your scope it should yield an exit pupil of around 7.5mm.
    Did I miss something? It looks like in f/5 scope it should give 30/5=6mm exit pupil. But if he actually has a f/6 scope than it'll be just 30/6=5mm exit pupil. To get secondary mirror shadow in this scope you'll need FL like 40mm+. IMO, it's the best budget observing eyepiece for f/6 Dob maxing out the TFOV. Although, if light pollution is significant it'll show washed out background, but under a dark sky should be excellent. I'm planning to get this EP myself for my f/6 Z8.
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