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Thread: TeleVue EP's for f/4.9 DOB

  1. #1
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    Default TeleVue EP's for f/4.9 DOB



    I currently observe with the Orion Stratus line of EP's. These are similar to the Baader Hyperion EP's. I like the Stratus EP's and can deal with the little coma at the edge of the FOV. However, I'm was wondering the Televue EP's will give me more contrast on DSO's mostly galaxies and globular clusters. I observe mostly in my backyard which is in a white LP zone. I sometimes observe at my astronomy club's so called "dark site" in an orange LP zone. A hint of the Milky Way can be seen there. Because of observing globular clusters, galaxies and the smaller planetar nebulae, my 8mm Stratus is my most used EP. Therefore, if I upgrade, for starters I like to replace the 8mm Stratus with the Televue Ethos 10mm 100°, Delos 10mm 72°, or the Nagler 11mm Type 6 82°. Under my conditions are these worth upgrade to? These EP's aren't cheap.
    Scopes: Orion Astroview 6 EQ 6 inch (150mm) f/5 reflector w/Orion EQ-3M Single-Axis Drive and Orion SkyQuest XT12g GoTo f/4.9 Dobsonian
    Eyepieces: Orion Sirius Plossl 25mm, 10mm, 6.3mm, Orion Stratus 24mm, 17mm, 8mm & 5mm, & 2x Shorty Barlow
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    Default Re: TeleVue EP's for f/4.9 DOB

    I really like the 10mm Delos in my Z12 (f/4.9). It gives great contrast and sharp stars out to the edge. It was spendy but, I think it was worth it.

    Most of my observing is from my backyard (in a red zone).
    -Oliver

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    : Orion XT8i, Zhumell Z12
    EP's: Orion Expanse 9mm, Tele Vue 10mm Delos, ES 68° 16mm, ES 68° 24mm, 2" Q70 32mm, 2x Orion Shorty
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    (and various Plossls)
    Bino's: 12x42, 12x60

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    Default Re: TeleVue EP's for f/4.9 DOB

    In my Z12 at f5 I like Panoptics at longer focal lengths and Delos at shorter. I used to own the Hyperions but found the contrast to be not as good. I have no experience with TV Ethos, but the ES 100 degree AFOVs are very satisfying when I want those wide open spaces. I used to live in a red zone and now am in a dark green zone. With greater LP the TVs were already more satisfying.

    I also used to have the Naglers type 6 and all. When I settled on my preference for 70 or 100 degree format the 82 degree Naglers disappeared with the Hyperions. That's individual taste working. Try before buy if possible.
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    Default Re: TeleVue EP's for f/4.9 DOB

    Quote Originally Posted by not_Fritz_Argelander View Post
    In my Z12 at f5 I like Panoptics at longer focal lengths and Delos at shorter. I used to own the Hyperions but found the contrast to be not as good. I have no experience with TV Ethos, but the ES 100 degree AFOVs are very satisfying when I want those wide open spaces. I used to live in a red zone and now am in a dark green zone. With greater LP the TVs were already more satisfying.

    I also used to have the Naglers type 6 and all. When I settled on my preference for 70 or 100 degree format the 82 degree Naglers disappeared with the Hyperions. That's individual taste working. Try before buy if possible.
    When it is time to replace my 24mm Stratus, I was thinking about a similar focal length Panoptic.
    Scopes: Orion Astroview 6 EQ 6 inch (150mm) f/5 reflector w/Orion EQ-3M Single-Axis Drive and Orion SkyQuest XT12g GoTo f/4.9 Dobsonian
    Eyepieces: Orion Sirius Plossl 25mm, 10mm, 6.3mm, Orion Stratus 24mm, 17mm, 8mm & 5mm, & 2x Shorty Barlow
    Camera: Canon EOS T3i
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    Default Re: TeleVue EP's for f/4.9 DOB

    Quote Originally Posted by skfboiler View Post
    When it is time to replace my 24mm Stratus, I was thinking about a similar focal length Panoptic.
    I think you'll be pleased!

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    Default Re: TeleVue EP's for f/4.9 DOB

    Sounds to me that changing your conditions would help a lot more than an eyepiece TBH.
    Tank of gas = best accessory you can buy
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    Steve

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    Default Re: TeleVue EP's for f/4.9 DOB

    I think the bigger difference switching to something like a Delite or Delos will be off-axis correction rather than contrast.
    I am personally not a fan of 100° eyepieces, I find that the 70°-72° are the best. I have tried the LVWs, XWs, Nagler T6s, and now have the Delos 4.5mm - 14mm and the N22T4 as well as the N31 T5. I found the XWs to be about the best but in the end had to cut back on my inventory and kept the TV Delos and Naglers.

    Another couple of excellent eyepieces I have kept are the Tak LE18 and LE24.

    I think your best bet would be to get to a darker site as often as possible.
    Matt @ Canberra
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    Default Re: TeleVue EP's for f/4.9 DOB

    Delos does improve off axis correction, true. But it also improves on axis contrast. I use them in my Dob to get subtle details in planetary and nebula contrast and find that they are the equal of Baader Classic Orthos in rendering internal contrast details. The BCOs are the best apart from the KK Fujiyama Orthoscopics at that task but they both suffer from a narrow field of view which may be inconvenient with a manually guided Dob.

    Now if you want greater sensitivity of detection whether there is an object there or not and how big is it then the TV Plossls (new or recent make) seem to be the champ. But I do not see a wide field eyepiece that does the same thing..... Wide field means more glass and coatings so....

    Having observed from a LP red zone and a rural area with only a little LP I can appreciate that "tank of gas" argument. It has its points. But against the tank of gas argument there is the counterpoint that there are observing sessions I would have missed entirely had I needed a tank of gas to accomplish them. So having bought a Delos I saved myself way more observing sessions and many tanks of gas.

    I think that the OP lives in NW Indiana US which is near Chicago. He'd need a big tank of gas to get away from that LP.....
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    Default Re: TeleVue EP's for f/4.9 DOB

    Delos does improve off axis correction, true. But it also improves on axis contrast. I use them in my Dob to get subtle details in planetary and nebula contrast and find that they are the equal of Baader Classic Orthos in rendering internal contrast details.
    I should have said that Delos is the "near equal" of orthoscopics with regard to contrast. Sorry for the imprecision. I am impressed that Delos does contrast so well....
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