compatible filters, guider and spectroscope

Discussion in 'General' started by Elham Ziaali, Aug 11, 2019.

  1. Elham Ziaali

    Elham Ziaali Standard User

    Aug 10, 2019
    Dear Sir/Madam,

    This is Elham Ziaali, a PhD candidate in astrophysics in Research Institute for Astronomy and Astrophysics of Maragha (RIAAM) in Iran. I plan to equip an observatory to start photometry and spectroscopy of variable stars specially pulsating stars and Delta Scuti stars there. We have a 11 inches Schmidt-Cassegrain Telescope (from Celestron company) and we need a new CCD camera, proper filters, a focal reducer and a guider which will be another CCD camera with smaller pixel size which locate at the finder-scope. I visited your website and I selected STX-16803 CCD with FW7-STX filter wheel to do photometry. Since I am not very experienced, please let me know is it a suitable model for our goal with this kind of telescope? and what kind of filters will match with this CCD model and this filter wheel?

    I would appreciate that if I could ask you about the model of guider you suggest me?
    In case of spectroscopy, could you please suggest me the spectroscope models I can use with this telescope and STX-16803STX-16803 CCD?
    Yours Sincerely,
    Elham Ziaali
  2. Colin Haig

    Colin Haig Staff Member

    Oct 27, 2014
    The STX-16803 has a very large image sensor, compared to the what is available in an 11-inch SCT. It is likely too large for that telescope. Only the centre of the field would be properly illuminated.
    Is this a C-11 or a C-11 EDGE HD ?
    I would recommend the Aluma-U3200. It has 6.8um pixels, which are an ideal match for that telescope if you have excellent seeing conditions (0.5 arcsecond), and it supports a Remote Guide Head or a Self-Guiding Filter Wheel.

    There is also an STF-3200 which is less expensive, but it does not cool as well and does not have self-guiding capabilities or a remote guide head option. You could get a small CCD camera for that.

    Another option would be the STF-1603, with 9um pixels. If your seeing is 1 arcsecond, it is also an excellent camera, smaller, less expensive. This is the modern version of the famous ST-8, but does not have self-guiding capabiliites.

    We have 1.25 to 36mm filter inserts, and Custom Scientific makes photometric filters in 1.25" threaded cells that can be used with these inserts for photometry.
    Many people buy our 3 Narrowband filters, and a set of photometric filters, so they can do imaging and photometry.

    We no longer make or sell spectrographs.
    I can put you in touch with Shelyak Instruments if you need a referral.
    Best wishes,

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