Orion Stratus VS Baader Hyperion

JJLoke · Post by **JJLoke** » Mon Feb 11, 2008 12:27 pm

hi guys, im considering which to purchase over the 2 wide angle EP. i have read reviews and they said both are equally good and have it pros and cons.

does anyone here seen through the EP and like to share their comments ? thank you

tungkian · Post by **tungkian** » Mon Feb 11, 2008 1:51 pm

hyperions definitely.

i'm using a pair of hyperions 21 mm and 13 mm for binoviewing. fit and finish definitely better than stratus.

i've owned the stratus 21 mm before and there is a much more obvious yellow ring around the edge of the eyepiece.

Post by **weixing** » Mon Feb 11, 2008 2:13 pm

Hi,
I own the Orion Stratus 21mm eyepiece. It'll give a warmer view... a bit yellowish when viewing bright object... of course it won't change the colour of the object, but you'll notice the field is a bit yellowish and yellow object will be slightly more yellowish, such as the Moon. I think this warmer view is due to the glass they used. Also, the edge of the eyepiece will be yellowish if you look at bright object, such as the Moon, as mentioned by tungkian. Please note, you won't notice this yellowish view if looking at stars and deep sky object. Also, I think the Vixen LVW also got this yellowish view, but base on the review, Vixen LVW perform the best.

Orion Stratus and Hyperion are basically the same design (clone of Vixen LVW) ... just different coating and may be different glass. Base on review, Baader Hyperion had slightly better light transmission than Orion Stratus due to better coating and don't have the yellowish view.

Base on my experience on the Orion Stratus 21mm and other review, they don't work that well on fast scope. On my F5 scope, may be 60%-70% of the field is sharp and sharpness start to degrade gradually after that. If you play around with the focuser, I think you'll get... may be 85% usable field. Please note this is on a fast scope without coma corrector. I think this should also applied to Baader Hyperion as they are basically the same design.

Anyway, if you use on a slower scope, such as on SCT, I think it should be able to perform very well and will be a good, low cost wide field eyepiece. Also, I think Baader Hyperion will be a better choice than Orion Stratus.

Have a nice day.

MooEy · Post by **MooEy** » Mon Feb 11, 2008 8:30 pm

given the current offer on the hyperion, need to think meh? anyway, mine is on the way, when it arrive then i tell u how gd it is

~MooEy~

cataclysm · Post by **cataclysm** » Mon Feb 11, 2008 10:01 pm

I have a 21mm Hyperion too, and i must say that the edge peformance is poor.

JJLoke · Post by **JJLoke** » Tue Feb 12, 2008 12:50 am

woo mixed review ... >.<

im have the 3" WO F/6 scope, it is considered a slow scope right ?

i was hoping to get the Baader for DSO and wider FOV at higher zoom ~48x.

my 10mm plossl is hardly used as the field is really small and pretty uncomfortable

tungkian · Post by **tungkian** » Tue Feb 12, 2008 12:53 am

the hyperions will be good in a f6 scope. i've use it for binoviewing in a f5 refractor and it's pretty much sharp to the edge..very little distortion..

with the 13 mm and binoview, orion nebula looks 3D..and i get a bit "sucked" into the view after a while..

Post by **weixing** » Tue Feb 12, 2008 1:23 am

Hi,

woo mixed review ... >.<

That's always the case...

sharpness is some time quite personal... some may find it sharp while others with higher requirement may not find it sharp... you may think this is "sharp", but after you see something "sharper", you may not think so anymore... ha ha ha

im have the 3" WO F/6 scope, it is considered a slow scope right ?

I won't consider it as a slow scope, but at least refractor don't have coma. What focal length are you looking at?? The problem usually come with long focal length eyepiece, shorter focal length eyepiece are usually OK even in fast scope. May be you should try it on your scope to see and judge for yourself.

Have a nice day.

Post by **rcj** » Tue Feb 12, 2008 10:23 am

would like to give rise to the attention that a given unsatisfactory eyepiece performance on a specific scope does not necessary means eternal condemnation of the eyepiece being a poor performer. It also depends on the scope that you are using, the focal ratio of its operation, as well as the nature of the field curvature character of the scope in compliment to the field curvature design of the eyepiece. An eyepiece can function perfectly well in one scope, and perform badly in another, but this does not mean the eyepiece is a poor performer, perhaps it is more reasonable to say that it does not perform well under a given condition like under fast focal ratios for example. There is no single eyepiece out in the market that can perform superbly well under all focal ratios and through all telescope designs. You have to do your homework (read reviews, view physically, etc) before deciding if the eyepiece is right for your system or systems.

MooEy · Post by **MooEy** » Wed Feb 13, 2008 7:45 am

have to agree, eyepieces are very subjective to individual users. one may find a cheap wide angle acceptable while another may not like it.

anyway, my hyperion 21 just came yesterday. much much bigger than i had expected. eye relief is very gd, i can take in all 68 degrees fov with glasses on. no annoying blackouts. center of fov is sharp, but like cata has mention, edge performance isn't that great. beyond maybe 70% of the fov stars become slightly defocus due to field curvature. not much astig seen off axis. i guess the designers traded field curvature for astig. overall i'm quite happy, it's cheap and performs decent. i suspect the shorter focal lengths, esp the highly touted 17mm should be better.

~MooEy~