10" Sumerian, Webster D18, solar scope, small 'frac, Vixen Foresta 8x42 Take action against Light Pollution. Together we can make a difference.
Stellarvue SV70ED, UA DwarfStar, Oberwerk / AstroTech AT80EDT, AT Voyager / Celestron C6XLT, AT Voyager / Meade 8" LightBridge / Vixen VMC 110L (Baader Solar Film), Porta II / Celestron Nexstar 102GT, ES Twilight I / Oberwerk 20x80 DIII, Orion 10x50 Resolux
Quote:Having read many of your previous posts on how much you like the Radians I'm pleased to hear how much you like the Delos. Must be good if you're going to sell your Radians. I'm a little surprised that the 12mm Nagler/Powermate combination came in second. If I needed the eye relief I would definitely be looking at the Delos.
NP-101 on a DM-6
Teeter 11" STS/Waite Mirror
Zeiss, Fujinon, Nikon, Vixen binoculars
Quote:Gene, did you swap back and forth several times when comparing each eyepiece as Jupiter was getting higher in the sky? I certainly can't say I am blessed with good seeing conditions very often, but of the times I have compared my 8mm Radian to my 8mm Ethos, or my 6mm Radian vs my 6mm Ethos, or my 5mm Radian to 5mm Nagler T6, the Radians hold their ground quite well. I mean I have went back and forth between the 8mm Radian and 8mm Ethos over and over, just trying to find the slightest difference. The best I can come up with is a slight color tone difference. Obviously the Delos is a different animal than the Ethos, but I don't expect the difference is much between the two considering the similar design. I am glad you like your new eyepiece, but I would give it another go over several sessions before I condemned the Radians..Ken
Astronomer for the People. "Taking Chaos out of the Cosmos" "There's an amazing universe all around us...EXPLORE IT!!!" So many galaxies, so little time!
Quote:The king is dead long live the new king! But why is the extra 10 degrees of AFOV a pre?...when you observing the planets? I never think my radian AFOV is too narrow when observing the planets.It's interesting to see how the Delos perform against the Pentax XW's.
Quote: I rotated the eyepieces in sequence. As I noted, the views slipped in and out of fuzziness, with times in each eyepiece when the image cleared up.
Quote: I would give it another go over several sessions before I condemned the Radians..
Live Life Right. Aim High, Think High
Zhumell Z8. C6-SGT / ZEQ25GT. AR102 / WO Z71.Celestron 15 x 70 / Nikon 10 x 50 action series. Modest range of eyepieces, TV Barlow. Diagonals, FR's. Skytracker / Astronomik CLS II.Canon 70D / 550D.
I don't get no respect, but my scopes do! ---------------------------------------------- 1961 Swift 60mm model 839 (2); TV-102/GM-8; 1959 8" f/6 Treckerscope; 1959 8" f/7.4 Murray Scope; 1978 4" Edmund Astroscan; c. 1992 4-inch Celestron-Vixen SP-C102; c. 1950 20X60 Saturn spotting scope; 1963 7X50 Nippon Kogaku binoculars; Unitron #114 alt-az mount (Swifty-tron); Takahashi TOA-130S/EM-200USD3. Sold: my Fecker Celestar-4 after 40 yrs. of ownership (1970-2010).
Sergio - El Cubano Loco!!! 16" F4 Starstructure with Zambuto primary Takahashi FS-128 on a DiscMounts DM-6 A bunch of Ethos, a few Nags and a pair of Pans.
Quote:...It was done on an F/5, 12.5 inch Portaball. Jupiter was not well placed since it had just risen for about an hour before I did the test...
400mm f/4.46 self made Dobsonian on Tom Osypowski equatorial platform Skywatcher 130mm f/5 BlackLine (finder, widefield scope and solar continuum scope) Sumerian 250mm f/4.8 Alkaid (as travelscope without platform and on Tom O. platform above).
Quote:There's more to an eyepiece than the design's aberrations...
Quote:Quote:...It was done on an F/5, 12.5 inch Portaball. Jupiter was not well placed since it had just risen for about an hour before I did the test...What was an altitude of the Jupiter? 15-20 degrees over Horizon? Was not 250x too much in the conditions? Let's suppose that seeing (taking into account atmosphere dispersion) was close to 2". After magnification 250x it shall be 530" for eye. Or 9 angular minutes - atmospheric spot for observer.
It is interesting is it ever possible to distinguish fine difference in aberration balance of Radian and Delos on so bad background? That means that aberration spot of Radian shall be much more (or at least compatible) to that 9 angular minutes, including central part of field. Unbelievable!
Quote:Posted on another thread...forgot which one. To elaborate...Those who know me, I'm a Zeiss and Baader ortho fanatic when observing dim extended objects...and in the process of acquiring the 8mm AP SPL to fill in between the 10 and 6mm ZAO-II. I was told (but already knew) that the Delos is basically a narrow field Ethos with slightly longer eye relief (which I don't care about)...with nice very high transmission glass and glass matched coatings, etc...which give high glass count Ethos phenomenal transmission, contrast and other attributes which makes DSOs pop. BTW, those who don't know, the Ethos has 9 elements in 6 (I think) groups as Mr Bill took one apart and told us about it. Back to the Delos...it's got to have less glass and someone told me that it does have less glass than the Ethos...so I figured that it should outperform the Ethos, which is my current standard for wide field eyepieces.So...I had to see for myself....I borrowed a 6mm Delos from John Rhodes from TV at OSP...and used it for an hour or so under NELM 7.5 skies. I did not borrow the 10mm Delos as I know that the higher the magnification the wider the difference is...as some of you may have seen my comparison between the Ethos and ZAO-II on my <a href="www.faintfuzzies.com/ObservingAids.html" target="_blank">website</a>. (Scroll to the bottom)I compared the 6mm Delos with my 6mm Ethos and 6mm ZAO-II.I observed Hickson 99 and IC1296 with my driven 22" f/4 reflector. No Paracorr.Component E of Hickson 99 (listed mag 17.7) was held about 100% of the time with averted vision with the 6mm ZAO-II, and about 50% with the Ethos. Dropped in the Delos, it was in between the ZAO-II and Ethos. I was able to hold it about 75% of the time. At least two others confirmed my observation. I also switched back and forth at least three times, the last time after I went to look at IC 1296.IC 1296 - the low surface brightness galaxy next to M-57. The view in the Delos again was in between the Ethos and ZAO-II. Went back to Hickson 99 and did the 3rd swap.I like this eyepiece.Now, I've made the decision to unload some of my Ethos as I never use it knowing that I'll lose something. Now I found something that will do a bit better, so I'm acquiring the Delos to be my widefield eyepiece...which is very useful while observing Abell Galaxy Clusters without getting lost with the orthos...which I admit that I did on occasion...especially star poor regions.I think the Delos might be used from time to time...even though the ZAO-II and AP SPL still outperforms the Delos. I'm also looking forward to other Delos, which I hope will be 5 and 8mm focal lengths. Anything longer, I'll stick to my 13mm Ethos, the only one I'm keeping. Best part is I will be to get the "four" Delos for less than my 3 Ethos sold used...and still have some left...which I may spend on a Sloan G filter.If I need anything shorter than 5mm, I can stick any of the Delos in my outstanding TMB 1.8x ED Barlow.
Quote:Back to the Delos...it's got to have less glass and someone told me that it does have less glass than the Ethos...so I figured that it should outperform the Ethos, which is my current standard for wide field eyepieces.
Quote:Quote:Back to the Delos...it's got to have less glass and someone told me that it does have less glass than the Ethos...so I figured that it should outperform the Ethos, which is my current standard for wide field eyepieces.When the 13mm Ethos came out, rumors abounded about how it having few elements. The rumors were, I remind you, completely wrong. It might have less glass, and the price is lower, but it doesn't weigh much less, so I'm going to need some evidence before I will give any credence to the idea. A thorough reflection survey would be a good start (or a good finish if too many reflections are found). Perhaps, rather, it just has less expensive glass.Not that I care very much, mind you. My eyes, habits, and skies do not often benefit from the superior performance of my frequently-used 6mm ZAO-II and 5.1mm Pentax XO, so it has more than once crossed my mind to sell them. What has stopped me so far is that they have pretty much held their resale value this year, which is more than I can say for my financial investments.
Quote:But it does weigh less...glass doesn't weigh much...take a couple elements out and the difference would probably by 0.1 pounds at the most.
Quote:Not that I care very much, mind you. My eyes, habits, and skies do not often benefit from the superior performance of my frequently-used 6mm ZAO-II and 5.1mm Pentax XO, so it has more than once crossed my mind to sell them. What has stopped me so far is that they have pretty much held their resale value this year, which is more than I can say for my financial investments.
10" F/4.7 Modified Skywatcher Reflector, 38mm Orion Q70, 17mm Modified Ultima LX, 10mm TeleVue Delos, 7mm Pentax XL.