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Thread: LPR & OIII filter advice

  1. #1
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    Default LPR & OIII filter advice



    Hi, this is my first post.

    I'm three weeks into my first telescope, an Orion 127mm Mak-Cass, and I'm really enjoying it! Jupiter and Saturn look pretty good and I've enjoyed a number of the the brighter open clusters; like the beehive.

    Globular clusters, Nebulas and galaxies are so for very elusive. I *think* i actually managed to see a couple of galaxies; M65 & M66 in Leo. Very faint & fuzzy though. I finally got a clear night without the moon, but before I couldn't find any galaxy or nebulae.

    My problem, I live in a suburb right on the edge of a red zone. I also have to contend with a couple of street lights and some bright porch lights; I think i can talk the neighbors into turning those off from time to time.

    I hadn't even realized that I couldn't see the milky way anymore until recently!

    Since the handful of faint fuzzies I've managed to see we're really faint already, would using a LPR, UHC and/or OIII filter help or just choke out what light there is in my 5in Mak-Cass?

    The closest dark site i've found is about 40 min away, which is rated at about Mag 6 unaided. Darker sites are at least an hour away. So, i'm hoping filters will be useful.

    A secondary question, the long focal length is nice for solar system objects, but cuts down on the FOV. I've seen some focal length reducers online but don't feel i have enough understanding to know if they'd work in my scope. Do these help widen the FOV and do they dim the image like a Barlow?

    Thanks for any advice you may have!

  2. #2
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    Default Re: LPR & OIII filter advice

    One of the first things you need to consider is one, or more, light shields between your scope and the street/neighbor's lights. You can easily construct a frame from PVC pipe and fittings that will hold a cheap, blue tarp from Harbor Freight. I use four of them, each 8' wide.


    Next is to conserve the "dark adaption" of your viewing eye. Wearing an eyepiece on the viewing eye and only moving it to the other eye under the cover of a dark towel covering your head and the eyepiece when you're ready to actually view really helps. You'll look like a pirate, but all I can say is, Arrrrgh.

    I suggest a copy of Rod Mollise's book entitled, "The Urban Astronmer's Guide" (Amazon ~$24). In it he goes into great detail (including filters) to describe many techniques, tips, and equipment to deal with light pollution.

    Clear, Dark Skies
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    Default Re: LPR & OIII filter advice

    I think John meant wearing an eyepatch, not eyepiece....


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    Default Re: LPR & OIII filter advice

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    Default Re: LPR & OIII filter advice

    Actually, there's an updated version of David Knisely's paper at:
    Useful Filters For Viewing Deep-Sky Objects | The Prairie Astronomy Club

    As for Scott's comment, "I think John meant wearing an eyepatch, not eyepiece....", knowing how focused John is on "political correctness", no doubt he did not want to offend any pirates...

    Clear skies!

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    Default Re: LPR & OIII filter advice

    Thanks, Lowjiber, for the info. My son will really like the eye patch idea!
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    Default Re: LPR & OIII filter advice

    I will second the recommendation of Rod Mollise's book "The Urban astronomer's Guide"

    Definitely a must-read for your case.

    I know that there have been some recent threads here on filters too. I know Bryan (Bladekeeper) has recently used a Zhumell OIII and an LPR. Those can be gotten as a set very reasonably, as can the Celestrons.

    I think John meant wearing an eye patch, not eyepiece....
    I think John might actually wear the eyepiece, but leaves the covers on!
    Seriously though, buy a nice eye patch ... it helps immensely. They can be gotten through Amazon (or a drug store) cheap.
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    Default Re: LPR & OIII filter advice

    Thank you Dragonsfire, I'll have some reading to do tonight!

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    Default Re: LPR & OIII filter advice

    Ha, I caught that too. And, yes I wouldn't want to offend any pirates either.
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