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Thread: 80mm APO versus 120mm Achro

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    Default 80mm APO versus 120mm Achro



    Hello everybody,
    I've been asking a lot of questions and gotten many answers about choosing what I need to take the next step in AP. Everybody suggested an 80mm APO on a good goto EQ mount and I'm thinking about Orion's 80mm f/ 7.5 600 mm on their Sirius mount but then the Meade LX85 120mm f/5.8 700 mm on their goto EQ mount is starting to show up online for sale. Is the aperture difference worth the image quality? Filters that can help out with any CA? Then there's the difference in price, payload and one dealer is even giving a free polar scope. Meade states in the info that "it's suitable for lunar, planetary and deep sky observing", does that mean visual or AP?

    Which would you choose and why?
    Thank you,
    Dano

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    Default Re: 80mm APO versus 120mm Achro

    If you're thinking AP then you should be thinking APO, and yes it is worth it over an Achromatic. But Orion's scope is NOT an APO, they call it an APO because they use an element of ED glass. It is an ED doublet that controls SOME (not all) of the CA and is better than an Achro for imaging, but is not up to the standard of a true APO triplet. There are some ED doublets that outperform some APO triplets, but the Orion scope is NOT one of them.

    But do not let me dissuade from the Orion scope (it will deliver some good images), skip the Achro, aperture makes little difference in imaging (visual is a different story).
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    Default Re: 80mm APO versus 120mm Achro

    Your best bet is APO triplet for the reasons explained by Oz. Check out ES triplets. They typically go on sale twice a year (I think you may just missed spring sale) and often show up on used equipment market

    https://explorescientificusa.com/col...plet-refractor

    https://www.cloudynights.com/classif...s-apo-triplet/
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    Default Re: 80mm APO versus 120mm Achro

    Thank you so much for the quick replies!

    I'll keep this in mind as I try to figure out what EQ mount to go with the Explore Scientific OTA.
    Dano

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    Default Re: 80mm APO versus 120mm Achro

    Quote Originally Posted by Astroglide2015 View Post
    Thank you so much for the quick replies!

    I'll keep this in mind as I try to figure out what EQ mount to go with the Explore Scientific OTA.
    Dano
    ES 80mm APO and a Celestron AVX makes for a nice imaging rig.

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    Default Re: 80mm APO versus 120mm Achro

    I've been really going over the ES80mm APO but there just much info about mounting a finder scope and a guide scope. Is there more mounting screws not shown in the one picture at their website?

    Thanks,
    Dano
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    Default Re: 80mm APO versus 120mm Achro

    No, those are the only existing holes. You mount your finder or guide scope in the existing shoe or you can add mounting rings to the scope.

    The Sirius is a better mount for AP than the LX85 or AVX.
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    Default Re: 80mm APO versus 120mm Achro

    For what it is worth, my rig is an ES80CF on a Celestron AVX. I replaced the stock focuser with a Moonlite, which has two Synta mounts on it already. I use a QHY mini-guidescope (30mm f/4 = 120mm) and QHY5 II camera. This rig is just fantastic in my opinion. The operator is the weak link, here.



    You could replace the stock finder scope mount with a Synta mount, but -- I chose to replace my stock focuser with a Moonlite focuser. If you are wanting to pursue AP, you might want to consider a Moonlite. I have a spare Moonlite for 80mm refractors, if you find your self wanting to go that route. It has a flange for ES ED80CF and the drawtube is the short one, which you won't want, but -- I will give you the focuser and you can have it rebuilt to your spec very inexpensively. (It is a $275 focuser.)
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    Default Re: 80mm APO versus 120mm Achro

    I have an ES 80 triplet with an Orion Sirius mount. I can not praise it highly enough. It is light, rugged, dependable. I can take it camping or set it up in my yard. It is easy to use.

    BUT if I had it to do over I would buy something different.

    I would still get the ES 80 triplet, but as much as I like it, I would not get the Sirius mount. I eventually started to want a little more from my equipment. I added an 8" SCT for planets. Then I got the bug for something larger and the mount couldn't take it. I had enough invested in it that I didn't want to toss it in the garage, but purchasing a larger mount was expensive.

    If I had it to do over I would still purchase the ES 80 triplet, but I would take a leap and get a mount, not for the triplet, but for the heaviest scope I could see myself go for someday.
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    Rob
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    Current Projects: nothing organized, just preparing for retirement in a few years
    Main Scopes: Orion XT10, Dob / ES ED80T / Orion 90mm Mak-Cass / 50 mm Galileoscope refractor / Celestron 8" SCT / Orion Sirius Mount / Various cameras and lenses

 

 

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