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Thread: Highest useful magnification

  1. #21
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    Default Re: Highest useful magnification



    Thanks, maybe I'll purchase that ten inch dob at the pawnshop after all. The price was right anyways, I got them down to $ 225.00 because, its missing the eyepieces , collumation and finderscope. The pawn shop said they were possibly going to post it on EBAY , It's from Rapid City South Dakota so maybe you could place a bid if your interested. Thanks again James

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    Default Re: Highest useful magnification

    Where I am, the Farmer's Almanac says Jupiter rises at 3:45 a.m. and the Sun rises at 5:59a.m. But it starts getting fairly light by a little after 5:00 a.m. I don't do a lot(really any) morning observing, so my advice on this might not be the best. I'd say you could catch Jupiter an hour before sunrise, but it would be low in the sky and the seeing might not be so good. Meaning, you probably won't get the clearest and best views.
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  3. #23
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    Default Re: Highest useful magnification

    Hello Nick, I just found out your name by joining the Celstron se group. I'm having a problem posting on that group. The post keep going to the astronomy forum. I was wondering if you are experienced in this group ? Only the introduction posted and is there a reply to check there? I posted a question and I don't know how to check the replies. Thanks Nick James.

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    Default Re: Highest useful magnification

    I would NOT buy that scope at the pawn shop. By the time you buy all the stuff that the scope is missing you may as well have bought a new scope with a warranty.

    I don't know what's up with the group link. If it keeps giving you problems I'd contact a mod.
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  5. #25
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    Default Re: Highest useful magnification

    The rule of thumb I have heard is that the best size eyepiece to use for galaxy viewing is 2x your scopes f ratio in mm which results in a 2mm exit pupil for viewing. So since your scopes f ratio is 10, that would mean around a 20mm eyepiece. Using eyepieces that minimize internal reflections and use extra low dispersion glass may help brighten the image.
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  6. The Following 2 Users Say Thank You to star2root For This Useful Post:

    Galileo3269 (07-01-2012),Jaminrc (07-01-2012)

  7. #26
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    This is a fun topic. I have been trying to get the most magnified image possible while keeping a descent quality image. What i have discovered so far is that the "Explorer 2,s" that came with my 5in. reflector are good ep,s but certainly not the best. Looking at Saturn, the 25mm ("Explorer 2") has the best quality but it,s the size of a pen head. Lol with the 10mm ("Explorer 2") it,s a little bigger and can see the ring separated from the planet and still good image but a little dimmer. I bought 2 barlows to get a bigger image right, i spend about 2 hours playing with them seeing which one works better with which ep. I even stacked them to get a huge image(Low quality). End the end the best image was with the 25mm ("Explorer2") barlowed with the "Tri-mag". I could almost catch a hint of the ring divisions, (but not quite). The problem is the "Explorer2,s" that came with my scope while good quality, are not good enough to pull out the detail i,m looking for. So, i think some "High magnification" super high quality ep,s s should give me the images i,m looking for. If not, then i,ll use a sledge hammer to fine tune it. I,m eventualy gonna get a bigger more expensive scope so i,ll probably get some Teleview "Radiums" or "Ethos". I,ve heard that these are the very best!!!

    Steve
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  9. #27
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    Default Re: Highest useful magnification

    Thanks, thats what I was thinking too so I bought the Celestron instead.

  10. #28
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    Default Re: Highest useful magnification

    I don't have a d 2 inch focuser I would have to buy a adaptor. Do you know if adaptors are a good add on , and do they work well?

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    If u dont have a 2 in focuser then i dont think u can use 2 in eps.

    Steve

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    Default Re: Highest useful magnification

    Unless your focuser tube is at least 2 inches in diameter, there is no point in using a 2 inch eyepiece, the light path would be constricted by the focuser tube. If your focuser tube is 2inches or more, but your eyepiece visual back (that is the part the eyepiece goes in) is only 1.25 inches, you may be able to get a 2 inch visual back to allow the use of 2 inch eyepieces.

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    mount. Takes 0.965,1.25,2 inch eyepieces./Celestron C-60 60mm refractor on manual ALT/AZ mount. Takes 0.965 inch eyepieces./Meade 152mm newtonian reflector on Meade LXD75 GEM goto mount. Takes 1.25,2 inch eyepieces.
    Eyepieces:0.965 inches: 25mm Kelner, 12.5mm, 8mm, 4mm, 25mm Meade MA/1.25 inches: 25mm Plossl, 10mm Plossl, 5.1 mm Epic ED-2, Owl 24-8mm zoom
    Barlows:0.965 inches: 2x and 3x barlows/1.25 inches: 2x achromatic shorty
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