ORION NEBULA

This topic contains 3 replies, has 3 voices, and was last updated by  David Galvin 3 years, 5 months ago.

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  • #5700

    jhadley2k
    Registered user
    0p

    Hi all

    I have a Skywatcher 250 using a x-cel-lx 9mm lens, while I can see the nebula it just appears as a grey cloud what filter would I need to show it in colour

    Regards

    John

    #5701

    jhadley2k
    Registered user
    0p

    Hi all

    After some digging I have found out that the only way you will get colours in a nebulae is with astrophotography

    not to worry,, maybe my next scope will be a ‘goto’

    Regards

    John

    #5724

    Mark Galvin
    Administrator
    0p

    Hi John,
    Yes unfortunately all the vibrant colours you see in astrophotography are very much enhanced, either by the use of long exposure, or often using a colour such as red to represent non-visible light like infra-red, or purple for x-ray light.

    That said, it is possible to see colour with the eye, but just not a lot of it. Some nebulae have a blueish tint to them, others green, others a slight pink, but certainly they don’t jump out like they do in the images.

    One of the reasons they seem so grey is because they’re so diffuse. The colours are there, but there’s so little light hitting your eye that it isn’t enough to trigger the cone receptors (which deal with colour) in your retina, so you see the image with your rod receptors instead.

    That’s also why with a large telescope it can be easier to pick out colour – since more light is collected and focussed, it has more chance of triggering the cones and so enabling you to see the hues a bit better.

    • This reply was modified 3 years, 5 months ago by  Mark Galvin.

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    #5727

    David Galvin
    Administrator
    2p

    As Mark says John, when we observe through the 30″ you can see colour in the Ring Nebula!

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