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Thread: Annoying reflection in my EP

  1. #1
    JerryPan's Avatar
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    Default Annoying reflection in my EP



    Hi guys,

    Could this be the cause of unwanted reflection in my EP (see the photo below).

    This is 32mm EP - no problem looking at stars but more bright objects as Moon or Jupiter creates this problem. I would say a few days ago I did not notice it - but yesterday it was little disappointment.

    There is missing black paint at the bottom of the EP - in the area where you thread in the moon or planetary filter.....

    https://gyazo.com/4b659c112bc98930cebc7b7d2693af62
    IMG_20160412_180824.jpg
    Looking up on low budget - but seeing a lot
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  2. #2
    bladekeeper's Avatar
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    Default Re: Annoying reflection in my EP

    Nah, those exposed threads should not cause any reflection trouble.

    Sometimes, when you are looking at bright stuff, the light reflects off your own eye and back off the EP glass.

    Try pulling a towel over your head next time, just to keep the stray light out. Doesn't help with stray eyeball reflections, but it does keep away other sources, and you are less aware of your eyeball.

    Heck, I'm like a Hitchhiker. I wouldn't be caught observing without my towel.
    Bryan

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  3. #3
    JerryPan's Avatar
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    Default Re: Annoying reflection in my EP

    Maybe I will fully - multi coat my eyeball ))). Good idea with a towel - thanks
    bladekeeper likes this.
    Looking up on low budget - but seeing a lot
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    Default Re: Annoying reflection in my EP

    Sometimes lights from nearby porches or streetlights gets into the eyepiece, causing you to think that maybe there is a galaxy in the edge of the field of view. The towel-over-the-head usually does the trick as Bryan pointed out.

    It may look a bit weird to family and neighbors, but it works pretty well!

    The added benefit is that it allows your eyes to become more fully dark-adapted, a big help when looking for galaxies and nebulae.
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  5. #5
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    Default Re: Annoying reflection in my EP

    There are various things that can cause reflections or apparent field brightening. One is having transient light entering the front of the OTA, so try to observe where this doesn't happen or use something to block such light intrusion. Another is as Bryan mentioned, transient light sneaking into the corner of your eye when looking through the eyepiece. You can use the dark towel/cloth trick to mitigate that. I will diverge with Bryan here and state that the area in the threads where the flat black paint has worn off can be a potential source, as could any brighter, unblackened surface within the eyepiece structure (that is why blackening the edges of lenses is important). With bright light from the Moon and Jupiter coming through the eyepiece, there most certainly could be some reflections off the exposed threading near the field lens. Using filters with an eyepiece can sometimes rub off the blackening and you may see some reflections as a result. Some eyepiece just seem a bit more prone to this than others. There is also the typical flaring one can see with many eyepieces when the Moon, bright planet or very bright star are just outside the field of view.

    Anyway, trying ruling out the obvious - namely stray light entering the front of the OTA, stray light entering the corner of your eye (use a towel to block it), or simple glaring due to the brightness of an object just out of the field. If you can rule those out, then I would say most likely it is a reflection caused by the threads that have the blackening rubbed off. Especially since you say this just became noticeable, have you been using filters lately with the eyepiece? You should be able to pin it down. To fix the blackening issue, of course flat black paint is the better solution, but one needs to be very careful working with paint near the field lens of the eyepiece. Some will use a sharpie, though its not as good of a solution. Good luck.
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    Default Re: Annoying reflection in my EP

    What brand/type EP is this?

 

 

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