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  1. #1
    oddbrain's Avatar
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    Default Two year old baby astronomer looking for advice.



    I have Orion Sirius Plossl 25mm, 20mm, 12.5mm, 10mm, 7.5mm 1.25” eyepieces and a Orion Q70 32mm 2” eyepiece.

    I use these with an Orion Classic XT8, 1200mm, f5/9 Dob.

    These lenses are multicoated, and I am considering adding a fully multicoated lens to my set to see if the extra coating makes a real difference in my viewing.

    I am seriously considering a 1.25” 40mm or a 2” 50mm.

    Somewhere I got the notion of looking at 4mm and 17mm also.

    But, I think the 40mm and 50mm may be more to my needs/wants.

    Please give me your advice.

    Thanks.

    Albert

  2. #2
    OleCuss's Avatar
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    Default

    Your telescope has a "lowest useful magnification" of 29x. That means that the longest focal length eyepiece you should ever consider getting for it is 41mm - and 40mm is as close to that as you will ever get. Another way of saying it is - don't get the 50mm since you'll be wasting your money.

    I think that a nice, useable 4mm EP (decent eye relief) will likely set you back something like $200? I think you could get a Tele Vue Powermate for that price and rock your 7.5mm and 10mm eyepieces to do a decent job for you.

    Flip side is that (IMHO) the Plossls are sort of marginal in a telescope which is f/5.9. So if you choose to get a few more higher quality eyepieces you might thoroughly enjoy the extra price? Not trying to diss those eyepieces too much - I've got the same scope and don't mind the Plossls in it too much.

    I'd not worry about the difference between "multi-coated" and "fully multi-coated" - I'm not sure that the difference would be real, let alone noticeable.
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  4. #3
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    Thanks OleCuss...

    I appreciate your thoughtful answer...

    gives me a little more knowledge to research with...

    Albert

  5. #4
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    Default

    As usual I am in complete agreement with OLDCUSS...



    You are seriously lacking in low powered eyepieces ....I would be looking for at least a 32 or 35 along with a 40...... Coatings ??? to be blunt I've been in this hobby for over 50 years and while coatings may be better my eyes sure are not ..maybe a Camera could "see" a difference but I do not think the Human eye can. see any difference especially in a brand names eyepiece...

    I'd also be looking at wide angle (68-70 degree FOV eyepieces) for a low powered eyepiece ... I'm not a fan of ultra wide angle eyepieces (82 degrees) but I am in the minority on that score ...most people love them I just find them too wide for my viewing "comfort"

    BUT the bottom line is you do need a few Low powered eyepieces and in the 50 or so years I have been in this hobby have only used a 50 mm eyepiece one time at a star party...I'm sure there is a need for one in some scopes for some targets but I sure have not found one...

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  7. #5
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    Default

    Thanks Bob327.

    I do have an Orion Q70 32mm 2” eyepiece. and I gather from what you are saying that a 40mm would be a good addition.

    I appreciate the comments on coatings and the ability of the human eye to tell the difference.

    Any thoughts on Plossl Vs Other Designs?

    I have stayed with Plossl in my astronomy infancy more for the affordability, and my perception through my reading, that they are "a lesser of all evils" choice once price is eliminated.

    Thanks for your help.

    Albert

  8. #6
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    Default

    Quote Originally Posted by oddbrain View Post
    Any thoughts on Plossl Vs Other Designs?
    With an f/6 scope, you probably won't see much difference between eyepiece designs. On a fast scope, you'd have to be blind not to notice the difference, but f/6 isn't considered fast. There's no reason to blow money on fancy designs unless you enjoy blowing money.

    Before doing so, I would recommend going to star parties and trying out other people's fancy eyepieces. If you see the difference and have to have it, then consider buying one.

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  10. #7
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    Default

    If I were you I would not get a 40mm eyepiece to go with an 8 inch dob. You already have a 32mm eyepiece that gets you a nice wide field of view. The 40mm will give you a large exitpupil(about 7mm) and unless you have very dark skies, things will probably look washed out.
    If anything I would upgrade the 32mm to a higher quality, better corrected eyepiece, but that is only necessary if you don't like the views it gets you. You could also consider upgrading some of the plossls to eyepieces with a larger field of view, which is handy for a manual dob like yours.
    Like other people said: don't worry about the coating differences. I doubt you'll see the difference.
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  12. #8
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    Thanks KeithBC.

    Another piece of the jigsaw falls into place.

    By the way, I probably would enjoy blowing money....

    but, alas, one must have it to blow first...

    LOL

    Albert

  13. #9
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    Thanks wallcreeper,

    I do like the view I get in the Orion Q70 32mm 2” eyepiece, and you have a good point about the exit pupil. It is 5.4mm and I have 60 year old eyes that probably will not be able to fully appreciate the 6.8 mm that a 40mm will bring.

    It appears that my beginners bumbling may have fell on good luck and I have an adequate range of lenses to guide me through the process of learning how to see.

    Albert

  14. #10
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    Odd how things work out...

    After two days of reading, seeking advice, and listening I end up getting a new eyepiece for my set but not what I started out looking for or expected...

    Last night I ordered a Baader Hyperion 5mm eyepiece...

    This gives me 37.5X to 240X magnification range, which is very close to the useful range on my telescope...

    Now I must learn how to see...

    Thanks for all your help...

 

 

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