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  1. #1
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    Default Baader Hyperion 3.5mm or 5mm



    Hello to all! I'm new here, I really could use some advice from somebody.. I have a Celestron c8-n reflector, (Aperture-203.2 mm, Focal Length -1000 mm,Focal Ratio-4.92 ,Highest Useful Magnification -480 x ) The thing is, I want to buy a decent eyepiece and that is the Hyperion WA 68 degrees, I-m just not sure wich one... The 3.5mm focal lenght will be too much for my telescope? Any help Would be appreciated.. Thanks!

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    Hi, welcome to the forum!
    Yeah, the 3.5mm might yield too much power for useful magnification which is dictated by the seeing conditions (atmospheric stability) in your location. Theoretically, the maximum magnification is around 50x per inch of aperture of your scope, or 50 x 8= 400 but very rarely will you have a clear view at that power (blurry is more like it). More realistic is around 30x per inch or around 240x, and that is on a good night. If I were you, I'd get an eyepiece (EP) that will yield an exit pupil of 2mm (the tube of light exiting from your eyepiece), because it is at or around this point that the scope is able to give the sharpest and clearest view, or the best visual acuity. Just multiply the speed of your scope by 2mm, or 4.92 x 2 = 9.84 or roughly a 10mm EP. There is a newly released Hyperion, the 10mm one, you can get that and also a 2x barlow to use with it so that you can have a 5mm (200x) equivalent to use for those nights when the atmosphere will allow it. But if you already have a stock 10mm EP that went with your scope, then the Hyperion 13mm would also be a good choice. Check out also the option of getting fine tuning rings (14 & 28mm's) for the Hyperion EP, that will allow you to have more lower focal lengths while using only one EP. Just my 2 cents.

    Best,

    Hernando
    Last edited by ibase; 12-31-2010 at 09:52 AM.

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  4. #3
    karolbm's Avatar
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    Thanks a lot for the reply! My scope came with a 20mm plossl, then I bought another one, a super plossl of 7.5mm...of course I have not seen a lot of the sky with this one...I read great reviews about the hyperion EP's though. I think I'll pick the hyperion 10mm. thank you, again for your answer.
    Regards, Karol
    Last edited by karolbm; 12-31-2010 at 12:03 PM.

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    You're most welcome Karol, glad to be of help!

    Best,

    Hernando

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    Default

    Your scope is right on the edge as far as how well it can handle less expensive eyepieces at f 4.92 I know that Hyperions/Oriion Stratus preform very well in my f/10 SCTS but they are marginal in my f/6 refractor ...seaguls near the edge of the FOV...

    So I'd really say you better only consider replies from those users with faster telescopes ...

    That said.... I personally would be looking for low powered eyepieces and a 2x barlow ... a 10 mm and a 2x barlow would give you 200x and I seriously doubt that you can view above 200x on a normal night ...

    Bob G.
    CPC1100 housed in a slotted domed observatory (Exploradome) 4 and 5 inch refractors for use from the lawn, a 8" Sct (NS 8i) for star parties...
    I Hate the winter so I use heated Motorcycle clothing to stay warm while observing in winter
    Retired, also have 2 other hobbies
    1. tinker with older Corvettes (6 in garage)
    2. make a heck of a lot of sawdust in my wood shop.

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    @Bob G - I read that too about faster scopes..so I'm pretty confused I really want to make some nice shots of Jupiter , or Saturn with my Sony HD camcorder... and I was gonna try to focuse in the future on deepsky objects...I guess I'll give it a try with a hyperion EP, must be somewhat better than the plossls I've got...am I right?

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    P.S . In my country there is nowhere to find in a shop the 10mm hyperion, the only ones are the 8mm or 13mm, is it wise to buy the 8mm?

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    Quote Originally Posted by karolbm View Post
    P.S . In my country there is nowhere to find in a shop the 10mm hyperion, the only ones are the 8mm or 13mm, is it wise to buy the 8mm?
    Have you tried your 7.5mm plossl with your scope? Is it sharp and not blurry? That should give you a pretty good idea on how the Hyperion 8mm should peerform; there are many owners of mirror scopes like yours (F/5 speed like Dobs) who are very happy using Hyperions with their scope, it's not perfect at the edge but a good compromise with respect to price/performance/field of view. Also, one other EP you might consider is the Hyperion 8-24mm zoom - very convenient to use, no need to swap EP's of various focal lengths in and out of the diagonal, and it will allow you to easily dial the exact maximum magnification that your scope/atmosphere will allow for and within a given night. I should know, it's my favorite to use among my 60+ eyepieces. Just another option to consider, it will cost you the price of 2 Hyperion though, but money well spent IMHO.

    Best,

    Hernando
    Last edited by ibase; 01-01-2011 at 12:16 AM.

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  13. #9
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    Default

    Happy New Year everyone!
    The 7.5 mm plossl gives me pretty good detail on the moon, but planets like Jupiter or saturn looks blurry and the eye relief is awful. That's why I thought the hyperion with its 68 degrees of field and the 20mm eye relief would be much better to see, photograph and record stars .Too bad I can-t try one before I buy, so I could see the difference from the plossl. by the way, with the 20mm plossl everything is crisp and sharp, but Jupiter is sooooo little

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    You're right, the eye relief (ER) on plossls particularly when going towards the shorter focal lengths can be quite uncomfortable to use and using a Hyperion with its 20mm ER will really be a world of difference by comparison. But blurry image on Jupiter and Saturn with the 7.5mm (133x)? Have you tried collimating your scope? And was it properly cooled down when you used the 7.5mm EP? The difference between a scope that's properly collimated and one that's not is like day and night so it might be something that you'd want to check into if you've not done so already. If collimation and acclimation of your scope's mirror are in order and you still get blurry images at 7.5mm, then I wouldn't recommend getting the Hyperion 8mm, because most likely, you'd still get a blurry image with it as well, just like your 7.5mm plossl. Look for a longer focal length EP, possibly the Hyperion 13mm.

    Best,

    Hernando

 

 
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