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Thread: Can sun damage telescope?

  1. #1
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    Default Can sun damage telescope?



    I have a Tasco 60mm with those sun plates that attach (see pic).

    I only used it once to view the sun, or actually create an image on those plates. But I've been told that aiming a telescope at the sun can damage the eyepiece because of heat being magnified. Is this true?

    Also, I was told to cover the finder scope because the sun's rays will burn the crosshairs. Is this true?

    Can anyone provide any Do's & Dont's?

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    Default Re: Can sun damage telescope?

    Don't use an eyepiece filter, the heat build up will crack it. Using your scope to project an image of the sun will also damage it. You can get filters for it though. I've never heard of the sun burning the finder scopes crosshairs but I'm new to all this and just wouldn't know.

    All the best.
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    Default Re: Can sun damage telescope?

    I have the same projection plate for my Bushnell 60mm. I have used it. I have not used it for long periods of time. But I have had no problem doing it so far. The finderscope can pass the sunlight focused through it and hurt you or catch something on fire just like a magnifying glass can if you focus the sun on dry grass. Take the finder off or cover it if pointing scope at sun. Also you should be careful of the scopes with plastic tubes.
    My Bushnell is plastic so I do not project for extended periods of time.
    Generally any uncontrolled, unfiltered optical device should not be pointed at the sun in my opinion. The projection should not really be a problem...mind the plastic tube is all.
    And of course DO NOT use the finder to aim the scope at the sun...had to say that.

    There are some pretty cool, simple devices that sit on the top of you scope tube to help you aim at the sun. You do not look thru them. They simply aid in lining up the scope by passing sunlight from one small hole in front onto an aiming card behind on the device sitting on top of the tube. I hope that helps some.
    Take care, and clear skies.
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    Default Re: Can sun damage telescope?

    I have the same projection plate for my Bushnell 60mm. I have used it. I have not used it for long periods of time. But I have had no problem doing it so far. The finderscope can pass the sunlight focused through it and hurt you or catch something on fire just like a magnifying glass can if you focus the sun on dry grass. Take the finder off or cover it if pointing scope at sun. Also you should be careful of the scopes with plastic tubes.
    My Bushnell is plastic so I do not project for extended periods of time.
    Generally any uncontrolled, unfiltered optical device should not be pointed at the sun in my opinion. The projection should not really be a problem...mind the plastic tube is all.
    And of course DO NOT use the finder to aim the scope at the sun...had to say that.

    There are some pretty cool, simple devices that sit on the top of your scope tube to help you aim at the sun. You do not look thru them. They simply aid in lining up the scope by passing sunlight from one small hole in front onto an aiming card behind on the device sitting on top of the tube. I hope that helps some.
    Take care, and clear skies.
    Mark

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    Default Re: Can sun damage telescope?

    Always put any solar filter on the input side of anything. Don't let direct sunlight enter your devices. I just made filters for my spotting scope and my Meade 8inch SC. Both go on the input side and will prevent any damage to both any your eyes. BE VERY CAREFUL.

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    Default Re: Can sun damage telescope?

    I never ever let any unfiltered sunlight enter my scopes (finders included) PERIOD. Do be safe and don't take a risk. I just wouldn't risk using an unfiltered lens for image projection.

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    Default Re: Can sun damage telescope?

    As much as I hate to admit,, I once allowed my finder to sweep past the sun without a lens cap. It had fallen off, I was setting up for solar viewing and caught it a couple seconds ( If that) and covered the lens.. Too late.. the cross hairs were melted.

    I have a LX90 and also cover the base and arms w/white dish cloths to prevent the motors and electronics from getting to much heat

    djl

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    Default Re: Can sun damage telescope?

    Quote Originally Posted by Anne-Marie View Post
    Don't use an eyepiece filter, the heat build up will crack it.
    .
    ABSOLUTELY!!!!! As mentioned elsewhere, my first scope, a newton I no longer have, came with an eyepiece solar filter. I destroyed it because common sense even though I was a beginner at the time told me it was dangerous. However, I did try it once WITHOUT looking through the scope and it did indeed heat up pretty fast!!! I eventually ordered a proper filter for another scope and eventually got a PST solar scope as well

    Take Care
    Abb

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