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Thread: Explore Scientific 127mm f/7.5 ED APO Refractor - vs - Explore Scientific 152mm f/6.5

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    Default Explore Scientific 127mm f/7.5 ED APO Refractor - vs - Explore Scientific 152mm f/6.5



    Okay,
    This is sure to draw some fire, but here it goes anyway. I am considering either of these 2 scopes. The 127APO is about $1700 bucks and the 152ACHRO is about $700 bucks. I am concerened about C/A and dont want to deal with it if it is excessive. So I guess the question is this, is the 127 APO worth the extra $1000 or would the 152 ACHRO be a better value with a Baader "fringe killer" or some other "M-V filter" to control the ACHRO Blues? The 152 also provides 44% more light gathering and a $1000 bucks to spend on accessories. I have a Celestron C-800 on a CGEM now and would use the mount with the new scope. My primary interest is deep space observing, the moon and the planets when they are around ( I look at everything). As my budget and time allows I will start into A/P as well, so keep that in mind when commenting about the scopes. I live in a very light polluted area of San Diego and do make it out to the desert quite often. I also have a line on a used Meade AR-6, but the Explore Scientific scopes seem to be much superior in quality and I have heard some stories about "bad" C/A in the Meades. Thanks in advance for the input...

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    This is a tough question, because you are asking us "how much" CA is acceptable????

    It's really a personal choice-- some people are not bothered at all while others complain about a tiny amount of color fringing.

    The doublet lower cost refractor is of good quality and should satisfy most people.
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    The ES 152mm is a very good scope, and the Baader "fringe killer" helps it. I have a Celestron 150mm f/8 and before I changed out the optics to ones made by RR Archromat from Holland, (no longer in business) the fringe killer worked very good. Even though the RR optics did a good job at controling the CA, I now use the Badder Semi-APO Filter with it, and it works great.
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    Default Thanks for the tip on the Baader semi-APO

    I've been considering that filter for the ES152 I've Picked up and repaired. There are some definate signs of CA on Far off objects. I guess they could be "Deep Space Objects", but I don't know - yet . Thanks Again.
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    Quote Originally Posted by Joe Lalumia View Post
    This is a tough question, because you are asking us "how much" CA is acceptable????

    It's really a personal choice-- some people are not bothered at all while others complain about a tiny amount of color fringing.

    The doublet lower cost refractor is of good quality and should satisfy most people.
    Thanks Joe,
    Your response begs another question...is there C/A in the APO? I'm sure it would be less, but is it still there? From what I've read, it (C/A) is not a "problem" with DSO's due to their lower magnitude. I'm kind of leaning towards the 152 ACHRO due to the bottom line cost and apature, then maybe next year sometime up-grade to an APO.

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    Most all APO scopes have NO false color and are widely used by astrophotographers.
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    Default Re: Explore Scientific 127mm f/7.5 ED APO Refractor - vs - Explore Scientific 152mm f

    ALPO, ACHRO, APO?

    Hello Fellow Members
    It is more than two years since the last post to your thread...While I was twinkle in the Forum-ent...the question still exists...eternal as the Universe!
    And the best answer for me...might not be the best answer...just one answer.

    This isn't Rocket Science...it's Astrophysics
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    Default Re: Explore Scientific 127mm f/7.5 ED APO Refractor - vs - Explore Scientific 152mm f

    Well as a follow up, I bought the E/S 127 APO and I'm very happy with it. I have used it for A/P on my CGEM and it has proven to be an excellent choice at the price they are selling it for. I have no C/A to deal with and don't need any filters. Is it as good as a TAK or a Televue or any other scope at three times the price, maybe not. Do I like the extra 5-6 thousand bucks still in my checking account...yes! Would I see any difference, probably. Am I very happy with my scope, absolutely! Would I like to have a TAK? Sure. Can I justify a TAK or other $7,000 scope? Not right now...but some day, maybe. But I'm very happy now.

    Clear skies,
    Bob
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    Default Re: Explore Scientific 127mm f/7.5 ED APO Refractor - vs - Explore Scientific 152mm f

    congratulations Bob - sounds like you made the right choice and having the bucks in your account is major plus - the best with your new set up

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    Default Re: Explore Scientific 127mm f/7.5 ED APO Refractor - vs - Explore Scientific 152mm f

    Re: Explore Scientific follow up

    Hello Bob
    After my post was entered, I looked for a recent entry of yours and saw your decision was made. Thank you so much for your / the additional input.
    I believe the E/S 127 APO, by virtue of the triplet, is inherently a finer instrument and would be easier to move and store than the E/S 152 ACHRO,
    and I also feel partial to that specific brand. Have no burning desire for a 152 APO and need no TAK as a statement.
    As far as seeing a difference - the physical parameters of the glass and lens design can be quantified, but I'm not sure your ''seeing a difference'' can,
    except to you. Psyco-Astronomy. Think canals. How can I distinguish between fine instruments without an A-B test? And will I see canals in both?

    I looked at Istar, an ACHRO. I decided refractor. I've decided on type, approximate size, and price range.
    I want greater than four inches and less than eight inches aperture...
    They (Canada/US Astronomical Seeing Observation Program) request a six inch or larger scope for ''seeing'' reports...(ClearDarkSky)...
    I'm looking at focal lengths...(There was a fantastic thread on focal length)...Saw a lovey Levy Cometchaser, but it's a different animal...
    IStar has Cometchaser designs also. There are telescope brands I haven't looked at yet...I need to investigate filter prices....
    I'm wondering about a bino-viewer add on and its weight...I have no mount, only tripods...etc.

    I know from your reply you made the best choice for you, and the choice of many others. A darn good one.
    Thanks Again.

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