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  1. #1
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    Default Advice on fitting filters



    Hello. This is my first post to the forum. I'm relatively new to telescope astronomy so I may ask plenty of dumb questions so apologies in advance.
    To kick off, can anyone give me any info about how to fit filters into a SCT. I'm planning to buy a Badder Neodymium & IR Cut (Moon & Skyglow) Filter 31.7mm, due to light pollution in my area, and don't know where it goes on the scope or how to fit it. Do I need any adapters etc?
    Any advice will be much appreciated. Equally any pictures showing how to's would be really helpful.
    I have a Celestron Nexstar 6SE.

  2. #2
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    Default

    The way we usually use the filters is to screw them into the barrel of the eyepiece.

    So check your eyepieces. If their barrels are threaded for filters you should have no problem using the filters.

    If the eyepiece barrels are not threaded, your eyepieces are likely of such poor quality that you need to get new (and better) eyepieces.

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    XX12G and XT8; 10 inch LX200GPS; Celestron NexStar 8SE; Tele Vue NP-101is (Petzval apochromat); Meade LS-8; WO GT-71; AVX and Losmandy G-11 mounts.

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  4. #3
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    Default

    I have several filters I bought for that purpose when I was new. I haven't used any of them in 5 years.

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    Default

    I don't know if this is the norm with all Barlows, but I can unscrew mine in the middle and add the filter there. Don't know if that is good or bad for the image quality because I'm a noob. But it makes it easier to switch out EPs without having to transfer the filter from EP to EP.
    I'm always learning, so PLEASE correct me if I sound misinformed. I will not be offended if you tell me I'm wrong. Thanks for your patience!
    Celestron 15x70 Binos w/ tripod, Celestron 6SE + 9x50 finder, EP/Filter Kit, Solar filter, f/6.3 reducer, OIII, LP, and UHC filters, NexImage, 8-24mm Zoom EP, Canon T3i
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    Default Filter fitting frenzy!

    I have a 25mm Celestron E-Lux Plossl eyepiece and am unsure where and how the filter fits into the kit. i.e. in the eye piece itself, before the diagonal, after the diagonal? Is ther a prefered position for improved performance? I know this may sound dumb, but I just need to clarify before shelling out on my filter odyssey. Any diagrams, pictures would be much appreciated. R.

  9. #6
    jerryTheC's Avatar
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    Depends on how you're going to use the filter. You can screw it into the eyepiece barrel, which makes it a little easier to take off if you're only using it some of the time - but means that you have to swap it over if you change eyepieces.

    Or, if you're using a refractor style diagonal going into a visual back, you can screw it in the (telescope end) barrel of the diagonal. If you're using an Sct style diagonal that screws onto the scope instead of plugging in like an eyepiece, then you can get special Sct mounting filters that screw in between the Sct and the diagonal instead. This lets you swap eyepieces while keeping the filter, but makes it a bit harder to add/remove the filter.
    <i><span style="font-family: Times New Roman"><font size="2"><b>SCT:</b> N11GPS <b>Refractors:</b> FS-60C/CSV, ZD-66, A80SS, FSQ106ED <b>Binoculars:</b> 8x42, 15x70<br /><b>Eyepieces:</b> 40mm Meade SWA, 28mm UWAN, 17mmT4, 12mmT4, 2.5mmT6 Nagler, 17mm, 8mm, 5mm LVW, HI-LE2.8<br /> <a href="
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  10. #7
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    Many thanks for the reply Jerry. That kind of makes it all clearer. I think, as I'm in a suburban area I will probably be leaving it in situ. I may have to go hunting a Sct mounting filter from my local astronomy shop. Gives me a good excuse to travel over there and drool over all the cool stuff on my wish list. Rich.

  11. #8
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    Default

    The only drawback with the Sct mount filters is that they're more expensive - usually a bit more than a 2" eyepiece filter, since they're around that size - and not all filters are available in an Sct fitting.
    <i><span style="font-family: Times New Roman"><font size="2"><b>SCT:</b> N11GPS <b>Refractors:</b> FS-60C/CSV, ZD-66, A80SS, FSQ106ED <b>Binoculars:</b> 8x42, 15x70<br /><b>Eyepieces:</b> 40mm Meade SWA, 28mm UWAN, 17mmT4, 12mmT4, 2.5mmT6 Nagler, 17mm, 8mm, 5mm LVW, HI-LE2.8<br /> <a href="
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    Default

    I was thinking more about my earlier post about placing a filter in the Barlow. My barlow unscrews in the middle, so I've put my moon filter there before, so the length of the Barlow is extended. This way I can easily interchange my EPs during lunar viewing without having to fiddle with the filter. Will this increase/decrease the magnification, or have any other effects?
    I'm always learning, so PLEASE correct me if I sound misinformed. I will not be offended if you tell me I'm wrong. Thanks for your patience!
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    Received the filter in the post. Fitted it within minutes! Feel a bit of a fool now as it’s all so obvious when you’ve got the kit in front of you. Anyway thanks everyone for your help.
    By the way - Badder Neodymium & IR Cut (Moon & Skyglow) Filter – really noticed a difference in relation to darkening of the sky and enhancing views on its first try out. Rich.

 

 

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