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Thread: Astrophotography on AVX mount with SCT or newt

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    Default Astrophotography on AVX mount with SCT or newt



    Hello I am considering to purchase my second telescope for my AVX mount.
    I have a orion xt8 skyquest so I have done plenty of visual but not much with photography(minimal with barlow).
    From reading the forums it seems like for the EQ mounts, 1/2 the payload weight is the way to go for astrophotography.
    I assume for visual, I can go closer to the max weight?
    Does this apply the same way for both SCT and newts?
    I was thinking the SCT can be more forgiving regarding the 1/2 weight limit for astrophotography since it is more shorter and compact? Correct me if I am wrong...
    Thank you!
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    Default Re: Astrophotography on AVX mount with SCT or newt

    The SCT is less forgiving due to it's longer focal length.
    The same amount of tracking error movement with both scopes, makes a larger error on the SCT image due to the longer focal length.

    The scope that is more forgiving of tracking and guiding errors is a small fast refractor.
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    Default Re: Astrophotography on AVX mount with SCT or newt

    Oh... thanks! I guess it wrong. lol...
    Considering SCT and newts with 1/2 weight of the payload, is one type easier to do photography than the other?

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    Default Re: Astrophotography on AVX mount with SCT or newt

    Quote Originally Posted by Reinverse View Post
    Oh... thanks! I guess it wrong. lol...
    Considering SCT and newts with 1/2 weight of the payload, is one type easier to do photography than the other?
    For DSO AP, the important factor is the focal ratio. An f/10 SCT will require four times the exposure time as an f/5 Newt for the same results. On the other hand, the SCT's long focal length makes it superior for planetary AP.
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    Default Re: Astrophotography on AVX mount with SCT or newt

    Always a confusing issue. I have always heard as a rule of thumb, max capacity for visual and half that for AP.
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    Default Re: Astrophotography on AVX mount with SCT or newt

    Quote Originally Posted by jeff581 View Post
    Always a confusing issue. I have always heard as a rule of thumb, max capacity for visual and half that for AP.
    I have found that it's closer to 80% for visual and 50% for AP.

    Stan
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    Default Re: Astrophotography on AVX mount with SCT or newt

    The capacities are really what are you comfortable with. I run about 30lbs on a 40lb-50lb (depending on who you ask) capacity CGEM and I don't have any issues with my AP. It's been my experience for AP about 75% capacity is the max that you want to load, less if you can swing it.
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    Default Re: Astrophotography on AVX mount with SCT or newt

    For someone starting out in long exposure DSO AP, it is always advisable to start with a short focal length (FL) refractor, an APO refractor if you can afford it.

    A nearly perfect combination for the beginning imager is the Celestron AVX mount with the Explore Scientific ES 80mm APO scope (not the only perfect combo). This scope plus all the extra gear you will need for imaging can easily be handled by the AVX mount.

    As you increase the weight or increase the FL of your OTA (optical tube assembly), you increase the chance that any number of errors will be introduced into your image (called a light sub), rendering it useless. Having to throw out light subs is a waste of valuable imaging time and will cause you frustration.

    So go small and easy to start.

    Cheers,
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    Default Re: Astrophotography on AVX mount with SCT or newt

    It will be funny if i tell you that i am looking for a heavy scope now, i have only ST80 and i have problem to balance it on my mount because the counterweight is more than that ST80, so sometimes i can't slew it roughly, so i try to put more accessories on/with ST80 so it can match the counterweight of the mount.
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    Default Re: Astrophotography on AVX mount with SCT or newt

    Some of my best images I have done with an ST80. Mine is used for wide field imaging and guiding and it gets used more that either one of my other OTAs. I recommend that every one should have one!
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