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Thread: So what else does the Celestron Edge "HD" give you?

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    Default So what else does the Celestron Edge "HD" give you?



    First off, anything with the term "HD" in it immediately sets my marketing-speak sensors off!

    What I know is, the Edge HD's focus plane is flatter, and you can purchase a focal reducer to widen the field and reduce the focal ratio therfore making it a better AP system. The standard C-series CSTs also have a combined flattener+reducer option which does essentially the same.

    So with both options, you get a F6.3 scope with a flat field. What else does the HD actually give you other than an emptier wallet? Is it all about superior optics in the HD?

    Cheers.

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    Default Re: So what else does the Celestron Edge "HD" give you?

    I believe the mechanicals of the EdgeHDs may be a little better - I've heard they are less prone to mirror flop. I don't know if that is really true.

    But I find it interesting that currently it is far cheaper to buy the focal reducer/flattener for the standard SCT than it is to buy what should be the optically simpler flattener for the EdgeHDs.

    Of course, for visual use the EdgeHDs should be a little better. Don't seem to be all that much better, however.

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    Default Re: So what else does the Celestron Edge "HD" give you?

    From what I have read and heard the main benefit is in its off axis performance. Additionally the Edge series come with vents for a quicker cooldown and they do have some sort of mirror support system to minimize mirror flop.
    We have one at my local club but we have not yet been able to put it through its paces.
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    Default Re: So what else does the Celestron Edge "HD" give you?

    The Edge HD series are optically superior to the standard SCT line in several ways.

    The biggest single benefit across the line is an unobstructed, optically flat field that will fully illuminate a full-frame 35mm sensor, without addition of a field-flattener.

    There are mechanical improvements, including improved focusing mechanism, and mirror locks, which prevent image shift and mirror 'flop' over the axis. The tube is ventilated behind the mirror cell for faster equilibration.

    The assemblies are FastStar compatible, and they are all hand-assembled and tuned, a feature the standard SCT line does not share. Most of the standard SCT's are FastStar compatible, but there is no guarantee that this will continue.

    The EdgeHD has engineered components specifically for use with a DSLR, which make Cassegrain focus with a consumer much more straight-forward - the T-ring/T-adapter line for the HD series works out of the box with Canon and Nikon cameras, without fiddling...
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    Default Re: So what else does the Celestron Edge "HD" give you?

    "The biggest single benefit across the line is an unobstructed..."

    Hi Austin but correct me if I'm wrong - since there is a secondary mirror on an SCT then it cannot be considered unobstructed. Unless you are meaning something else.
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    Default Re: So what else does the Celestron Edge "HD" give you?

    Thanks AustinPSD!

    Quote Originally Posted by AustinPSD View Post
    the T-ring/T-adapter line for the HD series works out of the box with Canon and Nikon cameras, without fiddling...
    Hmm... this sounds a little ominous do the Ts for non HDs not simply screw in?

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    Default Re: So what else does the Celestron Edge "HD" give you?

    Quote Originally Posted by MikeM51 View Post
    "The biggest single benefit across the line is an unobstructed..."

    Hi Austin but correct me if I'm wrong - since there is a secondary mirror on an SCT then it cannot be considered unobstructed. Unless you are meaning something else.
    I am referring to the image circle... unobstructed, as in with no mechanical vignetting of the sensor. All reflectors have a central obstruction...
    Last edited by AustinPSD; 02-27-2013 at 02:59 PM. Reason: network error
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    Default Re: So what else does the Celestron Edge "HD" give you?

    Quote Originally Posted by aysee View Post
    Thanks AustinPSD!



    Hmm... this sounds a little ominous do the Ts for non HDs not simply screw in?
    If you purchase the 93633-A and the appropriate Celestron T-ring, you will be OK - other variants have less precision in the rear-cell to camera focal plane distance.
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    Default Re: So what else does the Celestron Edge "HD" give you?

    9x50 finder scope
    9.25" or larger Edge scopes you will also get a Celestron Luminous 2" 23mm 82* ep
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