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  1. #1
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    Default DSO ep for 8" Dob???



    I have read MANY mixed things, (high mag, low mag) so i will post my desire. I have a 8" f/6 dobsonian and would like to get a ep that is "better quality" than the orion plössls included with the scope. I like when M81 and M82 are in the same FOV but wouldn't sacrifice a crisper, more detailed view just for FOV Unless it was still noticeably better than the 25mm plössl. Nebula and GLOBULAR CLUSTERS also catch my attention. But mostly Galaxies! Which ep would you suggest for this scope. $150-$200? Also, does a barlow take away visual characteristics when used for DSO's? I was considering a 21mm Orion Stratus.
    Orion Skyquest XT8i Dobsonion
    Orion Plössl: 10mm, 25mm
    Orion Stratus: 21mm
    Orion Edge-On Planetary: 6mm
    "Shorter of breath and one day closer to death" (Roger Waters)
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  2. #2
    astrobl's Avatar
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    Default

    Sounds like you allready picked a good ep!

  3. #3
    carnevali's Avatar
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    Default

    I have the 21-mm Stratus and I think it's an excellent choice. It's heavy though, about a pound or more. Will it throw off the balance of your Dob? By the way, I also have the 13-mm Stratus, which is great for higher magnifications of globular clusters (M3 was gorgeous in it), nebulas, and galaxies, as well as moon and planets, such as Saturn's moons (FOV approximately 0.6 degrees). I don't have a lot of experience, since I started really only recently to observe routinely, but I think those are both good choices. Of the two, I'd buy the 21-mm first. I use them on a 10", f=1250 mm Dob, and the 21-mm EP fits both M81 and 82 in the FOV, and I think they would also fit in an 8" with same focal length, but I wouldn't know for sure (I don't remember exactly how much space there is around them, but it's got to be enough, or I wouldn't have writtten down a note that says "nice view"!).

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    Antonino Carnevali

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    Human's Avatar
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    Thank you for the replies! So would the 13mm be better for galaxies? I have heard some say high power is better and some say low is better...
    Orion Skyquest XT8i Dobsonion
    Orion Plössl: 10mm, 25mm
    Orion Stratus: 21mm
    Orion Edge-On Planetary: 6mm
    "Shorter of breath and one day closer to death" (Roger Waters)
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  5. #5
    carnevali's Avatar
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    mhm, I don't know for sure, but have been experimenting lately with higher magnification and indeed it seems to help in detecting at least a hint of structure. Of course you have to restrict yourself to the brightest galaxies, or the higher magnification will wash out the view. I' suggest to try higher power on M81 and M82, and then M31 (Andromeda) when it comes out. By the way, I found an additional note in my log: "M37: simply gorgeous in 21 mm ..... and 13 mm: looks like a highly resolved globular cluster!" M37 is a tight open cluster still visible early in the night, in Auriga.

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    Antonino Carnevali

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    Default

    Thank you very much. I can't seem to get my mind off the stratus 21mm. Just 1 more thing. Does this perform better than say a typical plossl? like the orion sirius plössls?
    Orion Skyquest XT8i Dobsonion
    Orion Plössl: 10mm, 25mm
    Orion Stratus: 21mm
    Orion Edge-On Planetary: 6mm
    "Shorter of breath and one day closer to death" (Roger Waters)
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  7. #7
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    Yes, the apparent field of view is much larger, which in practice translates into getting the same image closer to your eyes. I tried it again last night. M81 and 82 fit nicely into the field of view of the 21-mm EP. I think the FOV is a function of magnification, so I think the 8" aperture vs. 10" should not make a difference (can someone confirm or correct this?). To be sure, I also tried the 13-mm EP and the two galaxies still fit inside the FOV, but JUST BARELY, one is at one edge and the other is at the opposite side, on the perimeter of the FOV. But then there should be no problem at all with the 21-mm. I also tried high magnification on galaxies. I chose M51, and looked at it at 96x, 139x, 178x, and 250x (Stratus 13-mm, Expanse 9-mm, and Nagler 7-mm and 5-mm). Indeed the spiral structure was coming out more and more distinct with increasing magnification, but it started looking somewhat washed out at 250x. Averted vision helped seeing better, and the structure still looked evanescent, no more than detectable, but that was the best view of M51 I have ever got, and I was quite pleased! I also looked at the Sombrero galaxy in the 7-mm (178x) and I had the impression that I could see the dark dust band in it. The globular cluster M3 was gorgeous again in the 13-mm, 9-mm, and 7-mm, and started losing too much contrast in the 5-mm.

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  9. #8
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    GREAT REPORT!!! Made me feel like I was reading from "THE BACKYARD ASTRONOMERS GUIDE" by Terence Dickinson and Alan Dyer - Great reference guide to learn EVERYTHING from btw. So I will go with the 21mm for this purchase 57x and 114x with barlow. Then the 13mm or maybe 17mm next time. THANK YOU VERY MUCH!!!
    Orion Skyquest XT8i Dobsonion
    Orion Plössl: 10mm, 25mm
    Orion Stratus: 21mm
    Orion Edge-On Planetary: 6mm
    "Shorter of breath and one day closer to death" (Roger Waters)
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    For some reason, when using my Celestron Zoom and just dialing in the "best view", the reading on the dial is almost always around 13mm. This is true with the 8" F/5, the 5" F/5 and the 5" F/12.
    Meade 16" LightBridge; Celestron G-8N Bird-Jones/motorized EQ5;
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  11. #10
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    HMMMMM....... Well I was torn between the 13mm, 17mm, and 21mm, I Just signed in to post that I just ordered (30 sec ago) the 21mm. MAN! I WILL HAVE TO GRAB THE 13. Both of you say it's great. Hope the 21mm isn't a huge let down. I should've waited till morning. Thank you though!
    Orion Skyquest XT8i Dobsonion
    Orion Plössl: 10mm, 25mm
    Orion Stratus: 21mm
    Orion Edge-On Planetary: 6mm
    "Shorter of breath and one day closer to death" (Roger Waters)
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