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Thread: Best eye piece for my Celestron CPC 800 gps xlt

  1. #11
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    Default Re: Best eye piece for my Celestron CPC 800 gps xlt



    That should be a great eyepiece for your scope. The only problem is that, like all zooms, it has a narrower field at the 24mm end (48°), so you will have a maximum true field of just over 1/2 a degree with your 2000mm fl scope. That will give you the full face of the moon, but not much wider at 83x. (The advertised "68° field" is only at the 8mm, high-power end: a bit of deliberate misleading by the manufacturer I think.)

    If you want a look at as much of (say) M31 as possible with your scope you could try the GSO 42mm superview; which is very good value for the price, and will give you a 1.4° true field. You will need a 2" diagonal for this though. Your 1 1/4 to 2" expansion adapter is not suitable for getting the best out of wide-field 2" eyepieces as you will experience considerable vignetting. Your other option is to get a focal reducer, to drop from f10 to f6.3.

    BTW, if you haven't already, I found the best upgrade I ever did for my CPC800 was to get the GSO 2" quartz diagonal instead of the stock 1 1/4" prism. All of a sudden I was seeing text-book stars instead of fuzzy blobs, and now I can make the most of my 2" eyepieces.

    All the best,

    Dean

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  2. #12
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    Default Re: Best eye piece for my Celestron CPC 800 gps xlt

    Quote Originally Posted by DeanD View Post
    That should be a great eyepiece for your scope. The only problem is that, like all zooms, it has a narrower field at the 24mm end (48°), so you will have a maximum true field of just over 1/2 a degree with your 2000mm fl scope. That will give you the full face of the moon, but not much wider at 83x. (The advertised "68° field" is only at the 8mm, high-power end: a bit of deliberate misleading by the manufacturer I think.)

    If you want a look at as much of (say) M31 as possible with your scope you could try the GSO 42mm superview; which is very good value for the price, and will give you a 1.4° true field. You will need a 2" diagonal for this though. Your 1 1/4 to 2" expansion adapter is not suitable for getting the best out of wide-field 2" eyepieces as you will experience considerable vignetting. Your other option is to get a focal reducer, to drop from f10 to f6.3.

    BTW, if you haven't already, I found the best upgrade I ever did for my CPC800 was to get the GSO 2" quartz diagonal instead of the stock 1 1/4" prism. All of a sudden I was seeing text-book stars instead of fuzzy blobs, and now I can make the most of my 2" eyepieces.

    All the best,

    Dean
    Even the 50mm GSO SV wouldn't be too much.
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    Default Re: Best eye piece for my Celestron CPC 800 gps xlt

    Quote Originally Posted by not_Fritz_Argelander View Post
    Even the 50mm GSO SV wouldn't be too much.
    I haven't tried the 50mm so I can't comment on it, but I own the 42mm. I find conflicting claims as to the AFOV of these. I believe the 42mm has a 65° AFOV, giving a TFOV of 1.37° in the CPC800, while the 50mm has either 60° AFOV (TFOV 1.5°) or more likely 54° (TFOV 1.35°), depending whom you believe. In any case, they give way more FOV than the Baader...

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  4. #14
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    Default Re: Best eye piece for my Celestron CPC 800 gps xlt

    Quote Originally Posted by DeanD View Post
    I haven't tried the 50mm so I can't comment on it, but I own the 42mm. I find conflicting claims as to the AFOV of these. I believe the 42mm has a 65° AFOV, giving a TFOV of 1.37° in the CPC800, while the 50mm has either 60° AFOV (TFOV 1.5°) or more likely 54° (TFOV 1.35°), depending whom you believe. In any case, they give way more FOV than the Baader...
    I believe the 50mm is closer to AFOV = 60 degrees, very similar to the 42. i have both.
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    Default Re: Best eye piece for my Celestron CPC 800 gps xlt

    Finally, clear skies after 4 weeks of clouds! Every time I get a clear sky, theres the moon bright and clear, not my first option. As I didn't have much time, i only tested my eyepieces on the moon. I must say i was impressed by the views from my Baader Hyperion zoom iv 8-24mm, also my new Explore Scientific 82º, 14mmEyepiece.
    Money well spent, both were well worth their money. As time was a factor, I didn't have time to test them on anything else.

    I did see something unusual 19 degrees north over Lincolnshire. I noticed what i thought was a very bright star, as I was looking at it thinking I didn't recognise it, or it's position it shot off to a very faint point then disappeared. I always know there's an explanation, but could't work it out. Did anyone else see? I'm just 10 miles out of Lincoln.
    Celestron CPC 800 XLT GPS. Baader 2.25x
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    Baader Hyperion Zoom
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    Celestron Eyepiece & Filter Kit 1.25 Inch
    Celestron 8-Inch SCT Eclipsmart Solar Filter - Black/Silver

 

 
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