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Thread: Opinions on 38mm Q70 for older eyes

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    Default Opinions on 38mm Q70 for older eyes



    Living with my 8x40 binos and enjoying the wide views while anticipating a new XT8i f/5.9

    I'm 61 and I don't know my pupil size but it's probably smaller than the 6.5mm exit of the Orion Q70 38mm EP. The 32mm has a smaller exit pupil. I want the widest view and good contrast and won't be getting any younger so is the 38mm a bad choice? I don't want to make an expensive mistake and also want to stay in the $100-$150 range for sure.

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    Default Re: Opinions on 38mm Q70 for older eyes

    No, I love mine (Agena) its crisp and nice detail. Its very popular.
    Some of the reviews;
    Agena Super Wide Angle Eyepiece - 38mm
    Neil
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    Orion XT8i, AR102
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    Default Re: Opinions on 38mm Q70 for older eyes

    So that's the same manufacturer, just different brand?
    Good price and free shipping.

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    Default Re: Opinions on 38mm Q70 for older eyes

    Either of these EPs should give you a nice wide view. Obviously the 38mm will give you a slightly larger tfov than the 32, but the 32 would work just fine also. I was actually looking at a couple of these 2" EPs for my 11" scope, but then I acquired an 82* fov EP and those wonderful wide views ruined me! Now planning out how to acquire an entire lineup of 82* EPs over the coming year...
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    Default Re: Opinions on 38mm Q70 for older eyes

    They are exactly the same eyepiece, from the same OEM. They are also the same as several other labels being sold through various vendors. Just that Orion overcharges for their name. I have not tried the 38mm, but I had a 32mm a few years ago. I have to say, I was not happy with it personally. In my f/5 12 inch that I had at the time, it was a bit messy in the outer portion of the field. A lot of elongated stars because of astigmatism inherent in a wide field Erfle design. When I sold the scope I gladly let the new owner have the 32mm as well. They should perform quite well in slower scopes such as an SCT however.

    As you mentioned, I would also be concerned about the exit pupil, as that effectively reduces your aperture because your eye cannot make use of the entire light cone coming from the eyepiece. Also, since you may be illuminating your iris, this increases the background noise level in the eye reducing contrast. However, I could see it having utility as a "finder eyepiece" in the scope due to its wider field of view. I am also 61 and try to keep my exit pupils around 5mm, as my eyes are happier that way. That is why I don't use 7x50 binoculars any longer, but 10x50s - because of the smaller exit pupil!
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    Default Re: Opinions on 38mm Q70 for older eyes

    I would recommend a 30mm or 32mm over the 38mm. The smaller exit pupil results in a darker sky background and better contrast. I use a 27mm Panoptic myself, but that is beyond your stated budget. Congrats on the new scope.
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    Regards,
    Clay

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    Default Re: Opinions on 38mm Q70 for older eyes

    I enjoyed mine the one night I've been able to view under clear skies since getting them. Best visual of Andromeda galaxy, Pleiades and Orion Nebula I've ever seen. I'm 52 and have astigmatism so have to use glasses. These are so much easier to get clear visuals than the Plossls.
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    Default Re: Opinions on 38mm Q70 for older eyes

    For just slightly over your stated budget this EP may work better in your 8" dob. They are on sale for $169 until the end of January when they go back up to the regular price of $209.
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    Default Re: Opinions on 38mm Q70 for older eyes

    Hello Swandog and all. I have the full set of Orion Q70 eyepieces. I got not only the "set discount" but I bought them on sale with free shipping several years ago. As to the quality, they do give a very good account of themselves when observing, for the money spent. However, I don't think that they come quite up to the expectations of the 2" Explore Scientific 82 degree eyepieces, although these cost a good bit more.

    Eyepieces2.jpg

    However, like KT4HX (Alan), I too noticed some coma at the edge of the field of view, especially in the 38mm eyepiece. I conclude that these must be a modified Erfle design. Also, Dragonsfire (Neil) has pointed out the cheaper clones from Agena AstroProducts. After all is said and done, and the money spent, these Q70s do have a nice eye relief, are reasonably sharp, and can get someone into the realm of wider field 2" eyepieces on a budget. I hope this helps Swandog, and the best of wishes on your future eyepiece purchase(s).
    - Marshall

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    Default Re: Opinions on 38mm Q70 for older eyes

    Quote Originally Posted by KT4HX View Post
    Also, since you may be illuminating your iris, this increases the background noise level in the eye reducing contrast.
    This is what I had in the back of my mind but couldn't get into the question. I didn't know where the extra light went. I do want good contrast. I wonder if at my next eye exam I could have my eyes dilated for a measurement or if that method would even tell much about my dark adapted pupil size.

 

 
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