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  1. #1
    Join Date
    Apr 2008
    Location
    Central Virginia, USA
    Posts
    572

    Default To cap or not to cap?

    I'm looking for some experienced advice about capping the telescope between imaging sessions.

    I have a 5" f/7 APO in a roll-off roof observatory. At my former home, the observatory was 50 feet from the house, and did not have a motorized roof, so I walked out in the evening to uncap the OTA and roll the roof open. In the morning, I closed-up everything.

    The new observatory is 300 feet away, and I have a motorized roof opener, so I can do everything from inside the house -- except cap the telescope. I can think of three options:
    1. Build a motorized lens cap controlled by an Arduino single-board computer, and operated remotely via Ethernet. (Or perhaps I could control the lens cap with an auxiliary relay contact on my Foster ROR controller.)
    2. Walk to the observatory to uncap/cap the OTA before/after every session.
    3. Leave the OTA uncapped most of the time, capping it only when several nights of clouds are forecast.


    The observatory is not sealed, so dust can infiltrate around the roof and through the screened floor gap around the pier. I don't think there's a lot of dust in fall/winter, but pollen and dust are present in spring/summer. In those seasons, I think the OTA should be capped whenever it's not actually imaging.

    What is the common wisdom about capping or not capping the telescope in a remote observatory? Any recommendations on what I should do?

    Thanks.

    --- Mike
    http://astronomy.mdodd.com

  2. #2
    Join Date
    Apr 2013
    Location
    Milton, ON, Canada
    Posts
    893

    Default

    You might check out the Flip Flat.

    https://optecinc.com/astronomy/catal...k/flipflat.htm
    It's not exactly what you want, but may serve 2 purposes.
    (I don't have one, but know a couple folks do).

    My RASA gets manually capped the morning after a run if the WX looks like it will be bad for a few days. Yes, I have forgotten a couple times.

  3. #3
    Join Date
    Apr 2008
    Location
    Central Virginia, USA
    Posts
    572

    Default

    I considered Flip-Flat, but don't want to spend the big money. For flats, I'll use either sky flats or an LED light box that's fairly flat. I can make a motorized lens cap, but I was asking for common wisdom before I undertake that project.

    --- Mike

 

 

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