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Thread: bloated stars with full spectrum mod

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    Default bloated stars with full spectrum mod



    If I use a full spectrum modded camera with my refractor I know that it will produce bloated stars because the lenses in the refractor are not designed to bring infrared to focus. My question is, Do I need to drop another $150 on an astronomik Ir/uv clip filter or could I use a cheap 48mm filter on my hotech field flattener which is threaded for 48mm filters and get astrophotography grade results? 48mm Optical UV IR Cut Filter for Camera Lens US | eBay I was looking at this filter for reference. Honestly as long as the stars are not bloated I will be happy.
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    Default Re: bloated stars with full spectrum mod

    Interesting question. I've not worked with a modded camera but my guess would be that filter placement in the imaging train isn't critical and that you could use the 48mm filter, but you might wind up losing some of the Ha signal depending on the response of the IR portion of the filter.
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    Default Re: bloated stars with full spectrum mod

    Any filter that includes some UV/IR blocking will work. The Astronomik clip-ins are great - I use one and highly recommend it - and they sell for about $110 (seem to have gone up a bit recently), not $150.

    See here at Optcorp...

    Alternatively you could use a screw-in type, like this one from Baader.

    Finally, light-pollution filters such as the Moon and Skyglow from Baader also block UV and IR.

    All are about the same price, but for ease of use the Astronomik is perhaps the best. Put it in and forget about it
    Dan

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    Default Re: bloated stars with full spectrum mod

    The Astronomik will outperform the other filters mentioned.

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    Default Re: bloated stars with full spectrum mod

    I got the clip in for my modified camera and I have a Baader Moon and Sky glow as well as other filters. I would say anything you can using to help cut out the unwanted light the better but don't compromise quality.

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    Default Re: bloated stars with full spectrum mod

    ok cool. Coming from a photography background I have a really hard time spending over $40 for a uv/ir filter because it is just a coated piece of glass and it kills me but if you think it will noticeably outperform a cheap 48mm uv ir camera filter then I will roll with the astronomik. This may be a good time for me to make a comparison.
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    Default Re: bloated stars with full spectrum mod

    Even in Daytime Photography, most enthusiasts (let alone any professionals) spend more than $40 for most every Filter - even those Color Enhancing ones that are truly "just a coating".
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    Default Re: bloated stars with full spectrum mod

    Quote Originally Posted by seigell View Post
    Even in Daytime Photography, most enthusiasts (let alone any professionals) spend more than $40 for most every Filter - even those Color Enhancing ones that are truly "just a coating".
    Well to a degree, stuff like polarizers can't be cheaped out on, I like B+W. Regardless I decided to get the astronomik cl CCD and I got it on astromart for an awesome deal.
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    Default Re: bloated stars with full spectrum mod

    The Astronomik is not just a coating.... It is a precision engineered hot mirror. Just one look at it will convince you - you won't see a normal photo filter that has a similar "coating".

    I only use B+W pro MRC (or Lee grads) filters for terrestrial photography - they are worth every penny IME.
    I'm sure you will be happy with the CLS-CCD. Ignore people who complain about the blue cast... It is trivially removed during colour calibration in post production.
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    Default Re: bloated stars with full spectrum mod

    Phil - you say "trivially removed" in post, but I honestly never got the hang of it. I think for some objects, color correction is easy perhaps because they only emit along the emission lines that the CLS CCD passes (such as emission nebulae). I shot the ring nebula with a moon and skyglow and its colors looked "correct" while the stars around all had a reddish cast.

    Galaxies and globular clusters that emit along a continuous spectrum I think is another story - I don't see how you can render a "correct" color image when a good portion of the color information was clipped by the filter?

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