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Orion Q-70 32mm 2" eyepiece: quick report
Friends,
This is not intended to be a really thorough review since I have nothing similar to compare the eyepiece to; rather it's just a brief description of the performance of the ocular in my first trial under the stars. With all due respects to Nagler products and enthusiasts, I have not the budget nor inclination to purchase one of their magnificent but costly products in a focal length near 32 mm. I very rarely use this focal length in either of my scopes -- a C-11 and an Orion SkyQuest 10" f/4.7 Dob -- since usually I am employing much higher magnification for the things that I prefer to see (small diameter galaxies and PN's.) But I was extremely disappointed with the performance of the Orion "Sirius" 32mm eyepiece with nebular filters: eye positioning is (for me) extraordinarily critical and fussy with this ocular, in either scope. And my 42mm 2" SuperWide (oriental import, obtained from StellarVue) produces an overly-large exit pupil in the Dob. So I have been thinking about getting a 32 mm 2" eyepiece for some time, and was considering the more expensive Orion "OptiLuxe" (costing $150, compared to $100 for the new Orion Q-70 in the same 32mm focal length.) I decided to try both of them in the Cupertino store, in the same model scope, and then unless there was something obviously wrong with the Q-70, to purchase it and try it out at night, trading up to the OptiLuxe only if necessary, in case I did not like it, before return privileges ran out. My tests of the Q-70 convince me I will keep it and not trade up to the OptiLuxe. In the store, I found that the OptiLuxe *seemed* to have a slightly brighter view of terrestrial sights (a large building a block or so north of the store, along Hiway 9, which is about the closest thing you can get in focus with most of the Newtonians) though it is hard to keep in memory the exact brightness and contrast of an image when you have to change oculars and re-focus. But, the eye relief of the OptiLuxe was much poorer than the Q-70; and it was noticeably narrower in field of view. I discovered in the store that the barrel of the OptiLuxe on display was very slightly larger in diameter than the one of the Q-70 taken out of stock. In fact, it was very difficult to get the OptiLuxe in and out of the new Orion Crayford focuser (same as on my 10" Dob): a further worry. Neither eyepiece would quite get in focus when pressed fully against the top of the focuser's eyepiece holder ring, focuser fully extended. But I was not certain if the building was actually far enough away to be considered at "infinity". Both the store manager, and I, found that it was necessary to pull the Q-70 out about 1/4 inch or slightly more, to get it in focus. Not a big problem, as there are two screws on the holding ring; and one can always make a small "parfocal" adaptor ring and place it over the barrel. I purchased the Q-70 and then, two days later when the weather cleared, tested it in the 10" Orion Dob at my site on private property at 3,400 feet elevation in the mountains south of San Jose. I was pleasantly surprised at the clarity, expecting a cheap eyepiece -- definitely not in the same league as a Nagler -- to have clean stars only a small inner diameter of the field. The star images were, however, fairly good to at least 75% of the full field diameter, better than several of my other moderate and lower power oculars (I do not presently own any Naglers or high end coma-correcting eyepieces, though I have in the past.) There was a slight difference in optimal focus position for stars right in the center of the field, and stars over to the edge, as I expected with an eyepiece of this relatively simple design and few elements, used in a fast Newtonian. I could find a reasonable compromise focus so that the whole field of stars looked acceptable, for viewing things like the Double Cluster. Unfortunately, at such low power (37.5x in that scope) my eyes tend to produce slightly astigmatic star images, evident when I use also my 42mm, my 40mm 1.25" Celestron E-Lux, or my Orion Sirius 32mm 1.25" Ploessl. So how much was caused by the eyepiece, and how much of the astigmatism is in my eye, I can't quantify. The only way I think I could do so would be a careful direct immediate comparison on stars with top quality Naglers or equivalents, which I haven't done (and am not likely to do, as I almost never attend star parties.) But I can say that my 42 mm 2" eyepiece, in the C-11, produces MUCH worse astigmatism than the 32 Q-70 does in my 10" Dob: so I suspect that the Q-70 would be no worse than the OptiLuxe in that respect. The star image quality in the Q-70 was actually quite a bit better than I had pessimistically expected. The eye relief and positioning are good although I found it necessary to put down the rubber eyeguard to comfortably see all of the very wide field. Only the stars at the very field edge were ugly, and then they weren't nearly as bad as in the 42mm ocular. It is hard to compare the Sirius 32 mm 1.25" against the 32mm Q-70, due to the unpleasant characteristics and touchy eye positioning of the 32 Sirius in a short focus scope. However, I did find that, as I had hoped, using a nebular filter with the 32 mm Q-70 was *distinctly* more pleasing and comfortable than with the 32 mm Sirius Ploessl. The filter threads on the Q-70 were very well cut and perfectly fit my Orion 2" UltraBlock. I was able to get some good views of nebular objects of large diameter that are a veritable *pain* in the 32mm Sirius 1.25". M-42 was quite a spectacle. In particular, I confirmed my earlier viewing several weeks ago of Abell 7 in Lepus. It was far too late in the evening for best conditions but I was dodging clouds and had to wait until the region was perfectly clear. Finally, about 2-1/2 hrs after Abell 7 had transited, I saw it with the Q-70 and the UltraBlock filter, with much more ease than I'd seen it earlier with the 32 mm Sirius and OIII or UltraBlock. This is considered a difficult observation for a 10" scope, to say the least. So I don't have any reason to suspect that the eyepiece will fail to give me good performance on faint objects. Now, I shall have to get a 2" OIII filter too! So, I'm keeping the Q-70. I'd also love, some day, to replace the focuser on my Orion 120mm f/8 refractor with a 2" barrel model, to take advantage of it with that scope. AstroApp |
#2
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Orion Q-70 32mm 2" eyepiece: quick report
My tests of the Q-70 convince me I will keep it and not trade up to the OptiLuxe. AstroApp I read a few favorable reviews on Cloudy Nights forum last night, after which, I came real close to pulling out the credit card. Probably buy it tonight. I need a few wide field ep's, and like you stated, it's pretty affordable. My longest ep fl is 26mm; my Orion HighLite Plossl. I cannot get the full double cluster in the view. That aggravates the heck out of me. Errol pasnola.org |
#3
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Orion Q-70 32mm 2" eyepiece: quick report
As I said earlier, the 32mm Q-70 does seem to show stars (at very low
power in my 10" f/4.7 Dob) with some astigmatism. I did a further test of this the next clear night, and was surprised that the Q-70's star images were actually quite a bit "tighter" and cleaner than those yielded by my Orion Stratus 21mm eyepiece -- which I'd considered acceptable in the Dob, though it looks nicer in the C-11. What would be useful to be able to judge the absolute quality of the Q-70 is of course a run-off against a really high end ocular. I used to own a 32mm Televue 2" eyepiece, made probably about 15-18 years ago. I seldom used it in my 8 and 10 inch scopes because I did not like the fussy eye positioning and the star aberrations -- in fact, I bought it used from a very discriminating observer who got rid of it in order to trade up to the later improved TV eyepiece in a similar focal length, but with wider field and better correction. I too decided, after a while, that this old 32 was slightly unsatisfactory (though it was far better than a cheap bottom-barrel Ploessl I'd earlier purchased for about $50!) Memory can be faulty, of course, but my impression of the Q-70's performance in my current scope is that it is considerably more satisfactory than that old TV model had been in the instruments I used to own (that ocular is not made any more, but was probably a modification of the Ploessl design.) Once again, the oriental knock-offs are producing good value for the money, for those of us who have a more utilitarian approach to eyepiece collection, rather than a connoisseur's appreciation. AstroApp |
#4
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Orion Q-70 32mm 2" eyepiece: quick report
I did a further test of this the next clear night, and was surprised that the Q-70's star images were actually quite a bit "tighter" and cleaner than those yielded by my Orion Stratus 21mm eyepiece -- which I'd considered... Thanks for the addendum. Errol |
#5
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Orion Q-70 32mm 2" eyepiece: quick report
In my initial comment about the Q-70 I mentioned that in the Orion 10"
Dobs, it is necessary to pull it out of the focuser for a certain distance, even with the focuser tube fully extended. Under the stars at night, this distance -- for my eyes -- was about 3/8ths of an inch. To increase the convenience I found that I could wrap two nylon cable ties around the barrel and tighten them so that their holding clips were opposite each other. Then, the eyepiece fit nicely into the barrel and could be held without tilting by the two screws for 2" eyepieces. The width of the cable ties may be altered as needed in this simple form of a quick 'parfocal ring' workaround. I don't consider this a defect of the eyepiece since it is hard to make a Newtonian with a focuser that reaches correct position with every single eyepiece on the market. To avoid vignetting, modern focusers don't have the long barrels of the older models that were once sold. With my C-11 there is sufficient focus travel, needless to say. AstroApp |
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