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  1. #1
    michael_wazowski's Avatar
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    Question Newtonian Reflector Questions



    Long story short: i bought a 114mm telescope. I will be assembling it tommorow after it arrives. I have, in the past few weeks, performed quite a lot of research into fact/fiction and caveats concerning telescope types, optics, collimation, and a myriad of other things.

    There are, however, a few (maybe newbie?) questions i have left. For note, the scope i have is a Celestron AstroMaster 114 EQ (equitorial mount) Reflector.

    1) I know that (typically) Reflectors do not have much extended play with the focuser, so parts like polarized filters have a tendency to not operate properly. This leads me to question the ability to stack filters on the eyepiece, like Baader's Fringe Killer coupled with the Moon and Skyglow Filter. It's okay if i can't, but it would be a serious boon if i could. Does anyone know if it is simply a lost cause on my type of scope, or is there a workaround for it, like using a diagonal?

    2) I want to have a couple of good ND filters, but i am wondering if, with a 114mm scope, if i even need more than one. At that, i wonder which ND filter would be the best in regards to Moon viewing. Polarized on a standard eyepiece is out of the question, but i have seen people mention splitting them with a diagonal. Any suggestions?

    3) The scope comes with two eyepieces. One 20mm and one 10mm. Other than a Barlow, are there any other eyepieces or associated accessories that i should feel are near-mandatory?

  2. #2
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    I am not sure what your issues are ith the filters. I have not heard of filters being an issue with Newtonians. Are you concerned about it being a Bird-Jones design? I suppose that too many filters stacked could interfere with the corrector lens.

    Before buying eyepieces of other accessories, use the scope for a while. If you need something, the need will become obvious, and then you will know what to get.

    If you have money burning a hole in your pocket, an observing chair is an often overlooked necessity.

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  3. #3
    michael_wazowski's Avatar
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    That's about what i figured with the filter selection. I guess i just wanted to have some before-hand knowledge.

    As for stacking the filters, i may have been confusing the Meade Variable Polarizing Filter with the screw-on types. (i had to take the url links out due to the "five post rule") If anyone can clear this up, that would be a great help. I am still curious about the ability to stack filters, though.

    And you know what? An observation chair has been a little thing in the back of my head. I am glad you brought that up! Would a padded stool work for the time being, you think?

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    Default

    A padded stool should be fine to start with. The main thing is that you are comfortable sitting at the eypiece. It is amazing how bad you feel and how irritable you can be when you bend over for a long period of time (ask my wife, heh).

    Allan

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  6. #5
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    Yes you can stack the Baader filters. I don't understand your question regarding the Polarising filters and focussing - the filter shouldn't affect that.

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    I would get a chair (small stepladder) and an eyepatch before I sunk any more money into filters or eyepieces.
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    I used a small kitchen stepladder (available at Target, Bed Bath & Beyond, et cetera) without a handle/grab bar. With the legs in the tripod kept to the minimum height (unextended), it was just right!
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  12. #8
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    Excellent!

    > I have a stepladder (two in fact - different heights), and a couple short barstools. Experimentation shall commence this evening, with any luck.

    > I didn't think about an eyepatch beforehand. neal_mlc, thank you for that tip! It's odd i didn't think of that -- i use that trick all the time when i have to light a room at night, then go back to bed.

    > Yeah, i think i was just being slightly paranoid about the scope not being able to accomidate multiple filters. Someitmes the internet can be full of all the information you need, then ONE caveat pops up and says 'GOTCHA'! Mind you, i am not trying to go nuts about filters, it's more just a wish to be knowledgable beforehand. I do know i will be performing solar viewings (with the correct filter(s)).

    To clarify, though, the issue with the polarizing filter is more of a general question about filters and the ability to stack them. My query stems from a warning about a certain variable polarizer made by Meade that evidently will not work with Newtonians because of the inherently short travel in the eyepiece tube (i may be off on my terminology here). Searching revealed a lot of not-much, and i have seen precious little information other than hints on the subject of filter stacking and that it can be done with some filters, but not all, especially if there is a lack of anti-glare coating as it will reduce the effectiveness of the filters.

    I will without doubt follow the advice of 'try it vanilla first, then determine if you need more stuff', as my instinct was to do that to begin with. I can wholey garauntee that this is a hobby i will love.

    Thank you all for your replies! It is well recieved!

    Mike.

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  13. #9
    KathyNS's Avatar
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    Quote Originally Posted by michael_wazowski View Post
    My query stems from a warning about a certain variable polarizer made by Meade that evidently will not work with Newtonians because of the inherently short travel in the eyepiece tube.
    That just sounds plain weird. If you have a link to the source where you found that, we can take a look and see if there is some truth to it, if there is a miscommunication, or if the author is full of it.

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  14. #10
    michael_wazowski's Avatar
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    Quote Originally Posted by KeithBC View Post
    That just sounds plain weird. If you have a link to the source where you found that, we can take a look and see if there is some truth to it, if there is a miscommunication, or if the author is full of it.
    A general internet search for this product will show the same thing no matter what site you go to. Here is a link to a page with the item in question: Meade - #905 Variable Polarizer - 07286 - OPT Telescopes This page does, however, give a me more information that previous ones: "Cons: cannot focus when using filter with a refractor telescope without using a Barlow lens."

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