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Thread: Explore Scientific 127 APO vs Explore Scientific 127 Achro

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    Default Explore Scientific 127 APO vs Explore Scientific 127 Achro



    All things being equal, will the visual observation in the ES127APO be so much improved that it is worth it to spend twice the price of the ESAchro127? Also, will the improvement in AP also be worth getting the ESAPO127 instead of the ESArcho127? Any insight will be appreciated.
    Thanks,
    Rich

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    Hi Rich,
    If you are seriously considering AP, get an APO, and you could also consider the ES102 APO. It has very nice views and will work for AP and is a bit less spendy. For AP you want an APO otherwise the purple fringe will invade your bright stars in photos. People do use filters to kill the fringe a bit on the Acros, but if you are serious about AP, the APO is going to be the way to go. If you are just going visual, I think the ES 127 Acro would be a great telescope.

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    Default Re: Explore Scientific 127 APO vs Explore Scientific 127 Achro

    Having never looked through an APO, I asked a similar question some time ago. The answer I got from those that have both achros and APOs is that there is a noticeable visual difference between them even at the same aperture. Obviously if you wish to get into AP, then the APO version would serve you better. But if you are like me, purely a visual person, only you can answer the question as to whether the price difference would be worth it to you. Since my AR127 is my tertiary scope, then for me, the answer is a resounding no. However, if it were my primary visual scope, then I might seriously consider it to get the best contrast, color rendering, clarity, and eke out as much detail from the scope as I could. Obviously the best thing would be to have the opportunity to look through them side-by-side with the same EPs to form a true opinion for your own eyes. But most of us don't get that chance. All that said, I can state that I am not disappointed in the AR127 at all. I think it is a very capable scope for the price, just as the AR152 is as well.
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    Having used both Achromats, ED, and APO refractors - for AP you really want at least an ED, and preferably an APO. The CA in an achromat will give you annoying haloes around stars, and rob you of sharpness. While you can take photos with an achromat, they're not going to be as good as with a better scope - so for one shot colour AP it's usually a no brainer - it's definitely worth spending more to get something better than an achromat.

    For visual use, though, it's a lot less clear cut, and more of a personal decision. Many of us can live with a bit of CA and find the view through a decent achromat quite usable. Going to an ED scope removes most of the CA, and a good APO is even nicer. The most obvious change visually - apart from the CA haloes going away - is that star colours become more vibrant, and since the different colours are focusing in the same place, you also get a bit more sharpness and contrast.

    So for AP, it's definitely worth going with the APO. For visual use, the views through the APO will be nicer - but deciding whether they're enough nicer to justify the extra cost is going to be a personal decision - especially if you could get a larger achromat at the same price.

    I suspect that a lot of folk with APOs bought them with AP in mind - and that the visual improvement is a nice bonus .
    Vondragonnoggin likes this.

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    Default Re: Explore Scientific 127 APO vs Explore Scientific 127 Achro



    I maybe able to help out and ad to this discussion in a couple of months. I recently picked up an AR-127 and have decided to go ahead and get the ED-127 after seeing the build quality of the AR-127 very nice. I've always wanted a triplet but was hesitant to spend the money and realized I'm not getting any younger and decided to go ahead and pulled the trigger. The weather hasn't allowed any use of the AR-127 as of yet it may take some time to get the side by side comparison that we are all interested in. I only plan on having one scope and that is also why I decided to pick up the ED version. I would suspect I'll have a like new AR-127 up for grabs before to long. It would be nice to keep it for the little bit of extra field being a F/ 6.5 though but could use the funds to get some decent eyepieces instead. I will more than likely keep the finder and 2" diagonal and have a tube assembly only available.

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    Default Re: Explore Scientific 127 APO vs Explore Scientific 127 Achro

    Thanks for all the thoughtful and experienced replies. They will greatly aid in my choice for a refractor telescope.

 

 

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