10" F/4.7 Modified Skywatcher Reflector, 38mm Orion Q70, 17mm Modified Ultima LX, 10mm TeleVue Delos, 7mm Pentax XL.
Quote: I too have heard good things about the 17mm in fast Newts., though the 32mm does seem to fall short.
"I have been paddling in the shallows of a great ocean of knowledge." - Sir Isaac Newton * * 15" F4.55 Starsplitter Dob & a Denk II binoviewer * * http://peaceofsky.wordpress.com/ Pacheco State Park Fremont Peak
Quote:32mm ultima is not the same type of design as the shorter focal length "hybrid" 2/1.25" like the 17 and under. I do not think there is a smyth/barlow group in the 32mm, so it does not handle fast scopes as well as the hybrids do. Much like the 24mm hyperion vs the 21mm, different beast with same name.This is why so many inexpensive EPs can work well in fast scopes, coma aside (which is far less intrusive than astigmatism, which will happen in fast well corrected scopes with cheap widefield eps). The 17 will probably perform similarly to a 17mm hyperion, but will not likely have the "pop" of a higher end premium, I would not be surprised if OP finds the edge performance acceptable at least, but a lower power version of a 10XW it will not likely be... However JOC has been known to have a surprise here and there, so who knows.
------------------------------------------------ Meade LightBridge 12" F/5. Oculars: Celestron Ultima LX in 32,17,13,and 8 mm. Baader Planetarium Hyperion 5 mm, and Meade 26 mm QX widefield. Baader Planetarium MPCC with visual ring set. JMI Train-N-Track. Celestron SkyMaster 15 X 70.
"Great men are forged in fire. It is the privilege of lesser men to light the flame." --John Hurt, as The War Doctor12" f/4.9 Skywatcher Collapsible Dobsonian8" f/4.9 Orion Newtonian on alt-az mountOberwerk 15x70 BinocularsMinimalist Eyepiece Collection: 30mm ES-82, 22mm Vixen LVW, 14mm Delos, 10mm Delos, 7mm Pentax XW, 2X GSO 2" ED Barlow, 3X Explore Scientific Focal Extender, 4X Powermate
Quote:Quote:Just curious, what do you mean by "OP"? Forgive my ignorance, but I'm not familiar with all the abbreviations. "OP" = original post or original poster
Quote:Just curious, what do you mean by "OP"? Forgive my ignorance, but I'm not familiar with all the abbreviations.
Homemade 16"F6.5 dob(Stellafane optical winner 1996) and 22.6" F4.9 homemade mirrors, 10"F7 dob (Stellafane 2nd opt 2009)Celestron Ultima 9.25 dynascope RV6 1973, Orange C14 1975,orangeSupC8,c11/C5orangetube CGEM, CGE, Meade 30 UWA5K,34&28mmSWA 5k,14mmUWA4K 4K/ES9mm&14mm100degree/panoptic 22mm/nagler11mmT6/7mmT1/3.5mmT6/T.V.WF 19mm and 15mm, Cel AXIOM LX 23mm/15mm Sears 80F15 3#4454/sears4-6344 76mmf16
Quote:I borrowed a 17mm Ultima LX once for use in my 8" f/4.9, and I have to say, I was impressed with its performance and comfortable eye relief given its reasonable price. I noticed some field curvature and astigmatism along the very outer edges, but nothing that really detracted that much from the view. This was used without a coma corrector, so that was a pretty unforgiving test chamber. Not perfect, but a solid, well-corrected wide-field eyepiece that's easy on eyeglass wearers.Clear Skies,Phil
Quote:I borrowed a 17mm Ultima LX once for use in my 8" f/4.9, and I have to say, I was impressed with its performance and comfortable eye relief given its reasonable price. I noticed some field curvature and astigmatism along the very outer edges, but nothing that really detracted that much from the view. This was used without a coma corrector, so that was a pretty unforgiving test chamber. Not perfect, but a solid, well-corrected wide-field eyepiece that's easy on eyeglass wearers.
1961 8" F8 Criterion Dynascope Deluxe (dob mount) C6, Celestron GT102 ,PST Vixen Ascot 10x50,12x50 Pentax PCF WP II Denk big easy pairs of TV 32mm,11mm plossls, celestron 25mm plossl, 17mm sterling, 9mm X-cel LX, 20mm superviews AT 17mm 70 AF, 8mm AT Paradigm, AT 12mm plossl ES 82* 6.7mm,11mm,14mm,ES 68* 24mm 2.25x Ultima Barlow VT 25mm Ortho, BCO 10mm,18mm, TV Plossl 15mm,26mm, GSO 40mm plossl, 20mm sterling 1 dog, 3 cats, 2 sons and a beautiful wife
Quote:If I'm not mistaken - the Astro Tech AF70 is the same eyepiece. I have had the 17mm for about 2 years now. I must admit it's me favorite eyepiece. It is perfect to the edge in an 8" F8 newt. The 17mm gives me 94x @ 0.72* TFOV. The Astro Tech version is extremely well built and IMO much better ergonomically and aesthetically. The coatings are a deep green and the eye relief is very comfortable. There's just something special about the image it produces. I suspect it has something to do with the huge eye lens. Using a DGM NPB filter on M42 produces an incredible image, bested only (in my set-up) by a Denk standard with 32 TV plossls.
Quote:make up your mind on that 5.2 already, HAHAHAH (clash's "should I stay or should I go" comes to mind)
Quote:I used both my 17 and 8mm Celestron Ultima LX last night. The views of the Orion nebula were excellent in the 17. I noticed a dark ring of space around the stars of the stellar nursery and the ghostly green hue with traces of blue,white and red. It was a dreamy sight. The stars themselves were perfect airy disks near the center of the field of view. This extended out to about three quarters to the edge of the field before astigmatism and coma first became noticable. Appearance of the Orion Nebula reminded me of a view I got with a 27 Televue Panoptic last month, except it was a lower magnification and the edge of field view in the Panoptic was far, far better.
The 8mm Celestron Ultima LX produced an excellent view of the planet Jupiter at 190X magnification. The details were sharp partly because the planet was nearly overhead. Subtle details within the belts could be easily seen.
Clear Skies, Stephen