British Astronomical Association

Supporting amateur astronomers since 1890

John Coffin

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  • 7 February 2018 at 8:27 pm in reply to: DSLR spectra Processing in ISIS #579082
    John Coffin
    Participant

    Thanks everyone for all your help. Here is the final calibrated spectrum of Merak captured with a full spectrum modified Canon 450D and an Alpy. I was using a 500 mm focal length refractor and used a QHYCCD Polemaster as an electronic finder. It has a huge field of view (11 x 8 deg) but showed stars down to magnitude 8 surprisingly. 

    6 February 2018 at 4:48 pm in reply to: DSLR spectra Processing in ISIS #579074
    John Coffin
    Participant

    Thanks Robin, that’s really useful advice. I do have the Alpy barlow. I changed the pixel size as you suggested and it worked. RMS now 0.12. John

    31 January 2018 at 6:21 pm in reply to: Finding/Guiding with a Lodestar #579031
    John Coffin
    Participant

    Thanks for the above advice. I’ve also installed Starlight Live to use with a Lodestar to make a sensitive electronic finder. 

    13 January 2018 at 4:30 pm in reply to: How do you find your target? #578961
    John Coffin
    Participant

    i took Alun’s advice and bought the secondhand Lodestar. The QHY5 is now attached to the finder and the Lodestar to the guide module on the Alpy.

    I lined them up on a radio mast a mile away.

    Here’s a write up. All I need is a clear night!

    John

    26 December 2017 at 9:48 pm in reply to: How do you find your target? #578893
    John Coffin
    Participant

    Thanks for all your advice. A  merry Christmas and a Happy New Year to you all. John

    23 December 2017 at 3:58 am in reply to: How do you find your target? #578888
    John Coffin
    Participant

    Would a QHY5 with a finder scope scope be good enough for an electronic finder scope or would I need a wider field of view? Mine is an Altair Astro 60mm with FL about 225 mm.  I see some people attach a camera lens to a webcam. Can someone give me more information about this set up and the software used? Thanks, John

    1 November 2017 at 9:56 pm in reply to: Best camera for Alpy 600? #578710
    John Coffin
    Participant

    Thanks, that’s helpful. John.

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