Click here if you are having trouble logging into the forums Cloudy Nights - Official Forums of the 2009 International Year of Astronomy Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User   You are not logged in. [Login] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Equipment Discussions >> Eyepieces Previous   Index   Next   Threaded   Pages: 1 redsquash super member Reged: 08/05/08 Posts: 105 Loc: JAPAN Is this 8mm Ethos redundant?       #2690886 - 10/10/08 11:23 AM Edit   Reply   Quote Quick Reply   Is an 8mm Ethos redundant , or almost redundant if A 13mm Ethos is used with a 2.5x powermate in my set up. I have an order on hold for the 8mm and will proceed with the 13mm ethos I guess I will also be selling some lenses -------------------- Vixen R130 f/5 powermate 2.5 vixen LVW 5mm ,13mm Vixen LV 8-24mm zoom Whats the next lens to complete this set up.please send me a PM if you like Post Extras:       jimmoscheck Pooh-Bah Reged: 01/08/07 Posts: 1048 Loc: Under the SE Michigan lightdom... Re: Is this 8mm Ethos redundant? [Re: redsquash]       #2691036 - 10/10/08 12:37 PM Edit   Reply   Quote Quick Reply   With a 2.5X Powermate and 13mm Ethos = 5.2mm " " 2X barlow or Powermate = 6.5mm A 1.6X barlow will yield close to the magnification of the 8mm Ethos. -------------------- Jim Moscheck 14.5" f4.3 home built Kriege stlye truss Stevens primary "A mind is like a parachute. It doesnt work if it's not open." - Frank Zappa Post Extras:       redsquash super member Reged: 08/05/08 Posts: 105 Loc: JAPAN Re: Is this 8mm Ethos redundant? [Re: jimmoscheck]       #2691052 - 10/10/08 12:43 PM Edit   Reply   Quote Quick Reply   Just wanted confirmation it was redundant which you indicate it is thanks -------------------- Vixen R130 f/5 powermate 2.5 vixen LVW 5mm ,13mm Vixen LV 8-24mm zoom Whats the next lens to complete this set up.please send me a PM if you like Post Extras:       keef95 member Reged: 04/16/08 Posts: 18 Loc: My Own Private Idaho Re: Is this 8mm Ethos redundant? [Re: redsquash]       #2691401 - 10/10/08 04:00 PM Edit   Reply   Quote Quick Reply   The 8mm Ethos would only be redundent if you don't need more than 125X. With the short focal lenght of the R130 f/5, even the 8mm Ethos w/2.5 Powermate will give you only a tick over 200X. -------------------- Obsession 18"/OMI primary CPC1100 w/Moonlight Focuser Zhumell 8" Dob Baader 5,8,13,17,24 & 36mm Ethos 8mm & 13mm UHC-S,O-III,M&SG,Vari Polarizer Post Extras:       ovgjr journeyman Reged: 09/14/08 Posts: 7 Re: Is this 8mm Ethos redundant? [Re: keef95]       #2691417 - 10/10/08 04:09 PM Edit   Reply   Quote Quick Reply   Are my 8 Plossl and 8 Ethos redundant? -------------------- Tele-Vue 60is Tele-Vue 102 Losmandy G11 Ethos 8mm Ethos 13mm Ethos 6mm pre-ordered Ethos 17mm pre-ordered Nagler 31mm T5 Nagler 26mm T5 Nagler 20mm T5 Nagler 16mm T5 Nagler 13mm T6 Nagler 11mm T6 Nagler 9mm T6 Nagler 7mm T6 Nagler 5mm T6 Nagler 3.5mm T6 Nagler 2.5mm T6 Nagler 2-4 zoom Panoptic 41mm All the TV Plossls Post Extras:       Terrance sage Reged: 08/11/04 Posts: 269 Re: Is this 8mm Ethos redundant? [Re: ovgjr]       #2691524 - 10/10/08 04:59 PM Edit   Reply   Quote Quick Reply   Ovgir: Yes, IMHO, for any viewing session where you would take your ethos. However I simply would not risk an Ethos at a public star party, do to concern about damage or theft. However, the 8mm ep probably fills a needed nitch in your magnifications, and you do not get much money by selling a used plossl anyway, so I would retain the plossl as a spare, and use it for situations where you do not want the Ethos at risk. -------------------- Terrance Celestron 9.25 SCT 10" f/5 X-Class Dob SV 102ED Post Extras:       ChrisBrowning newbie Reged: 04/23/08 Posts: 75 Loc: Jackosnville,FL Re: Is this 8mm Ethos redundant? [Re: Terrance]       #2691621 - 10/10/08 06:02 PM Edit   Reply   Quote Quick Reply   ovgjr, I've definitely got to go with Terrance on that, anytime your doing any public observing and need the 8mm, you don't have to get fingers and eye makeup on your ethos. So definitely not redundant. -------------------- In order to make an apple pie from scratch, you must first create the universe - Carl Sagan Member of North East Florida Astronomical Society (NEFAS) -Jacksonville,FL Zhumell 10" Dob-10:1 Dual Speed Crayford Focuser Meade ETX-60 'Backpack Observatory' Televue Plossls 8 & 15 mm Old 2.3x40 Constellation Binos 7x50 Alpen Binos Post Extras:       ovgjr journeyman Reged: 09/14/08 Posts: 7 Re: Is this 8mm Ethos redundant? [Re: ChrisBrowning]       #2692034 - 10/10/08 10:50 PM Edit   Reply   Quote Quick Reply   Point well taken. I would never take my Ethos to a star party, but let me state that there is something unique about the views of Jupiter and Saturn through the 8 Plossl. Maybe it's the simplicity of the design (less glass?). My friend at the club actually convinced me to get the 8 Plossl specifically for planetary observing. I also have all the T6s but still use the Plossl. By the way, the zooms are quite useful also. -------------------- Tele-Vue 60is Tele-Vue 102 Losmandy G11 Ethos 8mm Ethos 13mm Ethos 6mm pre-ordered Ethos 17mm pre-ordered Nagler 31mm T5 Nagler 26mm T5 Nagler 20mm T5 Nagler 16mm T5 Nagler 13mm T6 Nagler 11mm T6 Nagler 9mm T6 Nagler 7mm T6 Nagler 5mm T6 Nagler 3.5mm T6 Nagler 2.5mm T6 Nagler 2-4 zoom Panoptic 41mm All the TV Plossls Post Extras:       ChrisBrowning newbie Reged: 04/23/08 Posts: 75 Loc: Jackosnville,FL Re: Is this 8mm Ethos redundant? [Re: ovgjr]       #2692827 - 10/11/08 12:15 PM Edit   Reply   Quote Quick Reply   I have two Televue Plossls 8 & 15 and I love them for Planetary Observing. They Barlow very well and you don't really need a huge FOV for Planetary Observing. The only positive I have found for wide field planetary viewing is that obviously it wont leave the FOV as quickly. -------------------- In order to make an apple pie from scratch, you must first create the universe - Carl Sagan Member of North East Florida Astronomical Society (NEFAS) -Jacksonville,FL Zhumell 10" Dob-10:1 Dual Speed Crayford Focuser Meade ETX-60 'Backpack Observatory' Televue Plossls 8 & 15 mm Old 2.3x40 Constellation Binos 7x50 Alpen Binos Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 19 registered and 8 anonymous users are browsing this forum. 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