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  1. #21
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    Default Re: strange stars



    No! I have already experienced what the frost looks like It's something other. Opinions closimg to, that optics pinched.

  2. #22
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    Default Re: strange stars

    In this case the heater was on, may be not full throttle, but there is not too much room to force it.

  3. #23
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    Default Re: strange stars

    I do not know how much heat actually gets on the ota? I can barely feel anything from the heater strap at full output.
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  4. #24
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    Default Re: strange stars

    Hi Wboeck,

    "I made the mistake of placing the heater strap on the shield directly above lens retainer--" how to understand it? You mean the heater should not be placed on right in the plane of lenses? What was your winning solution? I put here a picture on my scope. The tube shield is in full extended position, and the arrow shows the place of plane of lenses (as I estimated) and the heater strap.strap nagy.jpg
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  5. #25
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    Default Re: strange stars

    I designed my straps myself, according what Power in [w] astronomy shops on their sites give to certain tube diameters for their straps, and from power came the needed current. I use a led dimmer to adjust the heating current. When it is on max, in coold weather I feel on my palm just warm, not hot. But I think if it is continous, (and it is), it can keep the tube warmer then outside.

  6. #26
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    Default Re: strange stars

    It did not help enough. ...

  7. #27
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    Default Re: strange stars

    Was worth a shot I guess. The location of the strap looks about right.

    I guess the only other alternative is to physically somehow loosen the mirror cell but I am not sure you want to go there.

    I get these patterns a little when cold but frankly some of it is from scratches and other crud on my filters as this picture of M45 will attest.

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    Default Re: strange stars

    Do you get the diffraction spikes with the scope without anything mounted on it? (Camera/ heaters)
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    Default Re: strange stars

    I meant the heater should not be placed on the dew shield. This is because the dew shield is insulated from the ota. I think it would be better to place it off of the dew shield and on the ota. It will be further from the lens but heat should still get to the glass and may work better.
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    Default Re: strange stars

    You do not necessarily want to heat the glass as much as keep the air in front of the lens a degree or so warmer than ambient so dew does not form.
    Refractors: Antares 105 f/15, Bresser 102 f/13.2, Celestron 102 f/6.5, 150 f/8, Stellarvue 80 f/6.9, TS 102 f/11, Vixen 115 f/7.7
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