Lens and setup advice

This topic contains 2 replies, has 2 voices, and was last updated by  eric 5 years, 5 months ago.

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  • #2805

    eric
    Registered user
    0p

    Hi Guys and girls

    I have a seben 700mm reflector telescope
    and have used it a couple of times now.
    its for my 10 year old son really so we are happy enough with the images we can see at the moment.
    advice Im after is the uses for the differing lens’s we have..
    we got a great view of the moon tonight in and out of the clouds
    using a 20mm..
    what I want to know is, with the other lens that came with the scope
    can someone please explain what the are used for.
    I will list them here…
    20mm as mentioned
    12.5mm
    6mm
    4mm
    barlow lens
    1.5 erecting eyepiece
    with hope
    cheers guys

    #3407

    Brendan Martin
    Administrator
    1p

    Hi Eric, the other eypeices are to increase magnification but to be honest other than the 12.5mm they will be unusable unless the scope is motorised, the erecting lens is for daytime use it will put the image the right way up (not required for astronomy) the barlow increases the magnification of your other eyepieces (eg: 20mm becomes 10mm if 2x barlow) again unusable unless motorised. we tend to use the lower power (20mm) to help spot objects and then up the power for closer views.
    Hope this helps
    Brendan

    #3408

    eric
    Registered user
    0p

    Yes it does Brian thanks…
    so basiclly its not worth using anything other than the 20mm
    with the seben….

    thanks for the reply

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