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Rchurt

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Posts posted by Rchurt

  1. Hello,

     

    I recently purchased my first telescope and camera, and now I want to make sure I have the correct Barlow or reducer to couple them together to achieve Nyquist sampling on the camera (or slight over-sampling). In case it’s important, I’m interested in planetary imaging—in theory that shouldn’t matter for this sampling question, but maybe there are other considerations to take into account.

     

    I used this calculator (https://astronomy.tools/calculators/ccd_suitability) and plugged in my info:

    Telescope: Celestron 8 SE

    Camera: ZWO ASI462MC

    Seeing: experimented with this one, but would like to get optics that allow for poor or very poor

    Binning: prefer 1x1 to preserve spatial resolution, but could consider higher if SNR is a problem

     

    I’ve seen on several forum posts that people often use a 2x Barlow to couple the two. However, according to this calculator, that will always lead to over-sampling. If anything, it says I should use no intermediate optics or even a reducer.

     

    So my questions are:

     

    Binning: Will I be able to see anything with 1x1 binning, or should I expect to need to bin to collect enough light?

     

    Is there some other consideration that’s more important here than achieving correct sampling? It seems like most others are over-sampling, and perhaps there’s a good reason for this. If so, is there another formula that would let me determine the appropriate optics to buy?

     

    Thanks in advance for any help!

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