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Thread: Filter size for use in wheel

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    Default Filter size for use in wheel



    I've been looking at monochrome cameras and filter wheel's. ZWO has kits for the ASI1600MM with filters in either 1.25", 31mm, and 36mm. The sensor is 22mm diagonal. Why would you need the larger (and more expensive) filters?
    Thanks

  2. #2
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    Default Re: Filter size for use in wheel

    The larger the filter, the less vignetting...
    I'm going to assume that they all fit in the same housing???
    (Not sure how that would work...)
    My sensor is almost a full 48mm Diag. I have to use 2" filters
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    Jim
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    Default Re: Filter size for use in wheel

    What telescope are you using with it?
    Stuart Forman

    Telescope Engineering Company 140mm f7 apochromat with TEC FF on Astro-Physics Mach 1 with RAPAS PEC trained to 0.87 arcsec. Also with A-P 27tvph focal reducer. Camera QSI 683ws-8 Astrodon Gen 2 LRGBHaO3S2 (5nm), Starlight Instruments Focus Boss focuser, Software: SGP, Pixinsight, Guiding with A-P Guiding bracket, 10X60 Vario scope, Lodestar, PHD. Rob Miller TRI36L tripod on JMI Wheely Bars. Twitter @s24man

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    Default Re: Filter size for use in wheel

    With an f/4 scope (wide light cone), I am using 36mm filters for my Atik 383. I am not getting too much vignetting.

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    DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier);
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    Default Re: Filter size for use in wheel

    Quote Originally Posted by jimminCT View Post
    I'm going to assume that they all fit in the same housing???
    (Not sure how that would work...)
    They have different 'wheels' some wheels, 2" for instance can only hold 5 filters, other smaller wheels can hold 6 or 7 or so.

    You can actually get additional wheels for different filter sets.
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    Scopes: Orion 130mm APO Triplet, Orion 8" f3.6 astrograph Mount: Celestron CGX-L Guiding: Orion 60mm f4 scope, Starlight Loadstar, PHD2 software - Cams: Planetary: ASI120mc, DSO:Atik 383L+, SGPsoftware Processing : Regisax, Deep Sky Stacker, Star Tools, Pixinsight Assistant: One very large cat
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    Default Re: Filter size for use in wheel

    The wheels are appropriate to the filter size.
    How do you determine what size you need to avoid vignetting? I would prefer to avoid trial and error considering the cost.
    Thanks

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    Default Re: Filter size for use in wheel

    Quote Originally Posted by JudeHey View Post
    How do you determine what size you need to avoid vignetting?
    I guesstimated. The light cone at f/4 is 14 degrees wide. My camera sensor has a 22mm diagonal. I guessed that a 36mm filter would be wide enough to allow that 14 degree cone into the corners of the image frame without too much being cut off.

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    DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier);
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  9. #8
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    Default Re: Filter size for use in wheel

    Just some back of the envelope math, with my f/3.9 and D5300, with the filter 1" from the sensor, that puts me at ~34mm already. Bigger than I thought I would need.
    Thanks!

 

 

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