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Thread: To wait or not to wait....for a used ASI120mm

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    Default To wait or not to wait....for a used ASI120mm



    I recently sold a vinyl cutter and some supplies and have $400 burning a hole in my pocket. I NEED an autoguider! I am pretty much sold on the ASI120 either the mm or mc. I think I would like to mono better for planetary in addition with autoguiding, but once again, I am at paralysis by analysis. So what does everyone think?

    I know if I go with the mono, I will eventually need the color wheel to process planets, but it seems like in the long run you get much much better quality photos with mono cameras. I guess that is still down the road, but it seems like the mono is better for an autoguider anyways.

    I don't think I can use the word "autoguider" any more in this post.
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    Default Re: To wait or not to wait....for a used ASI120mm

    Also, what about using the Orion StarShoot G3 as a guide?
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    Default Re: To wait or not to wait....for a used ASI120mm

    Unless you already have a used one in your target sights, you may have difficulty finding a used one. Heck, it's hard to even find a used NI5. If you are able to find one snap it up fast.
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    Default Re: To wait or not to wait....for a used ASI120mm

    I agree. Finding a used one will probably be quite difficult.

    When (if?) one does show up, you would have have to be quick to get it.

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    Default Re: To wait or not to wait....for a used ASI120mm

    I use the ASI120MC for autoguiding and its great. Plus I don't think the MM has much of an advantage over the MC in IQ, and then adding color filters and wheel for the MM makes it $200 more than a brand new MC.
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    Default Re: To wait or not to wait....for a used ASI120mm

    Both MC and MM work very nicely for guiding - in the vast majority of situations there is nothing critical to choose between them (I have both). For planetary the MM has a small sensitivity advantage but that has to be weighed against the hassle of shooting RGB. I would say that the MC would make 98% of people very happy in either use-case.

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    Default Re: To wait or not to wait....for a used ASI120mm

    Quote Originally Posted by Jameedon View Post
    I use the ASI120MC for autoguiding and its great. Plus I don't think the MM has much of an advantage over the MC in IQ, and then adding color filters and wheel for the MM makes it $200 more than a brand new MC.
    I use the QHY color version of this camera and I guide with it also. That said, the mono version has a higher QE than the color version which can be a huge benefit. Like when trying to guide, but you only have dim stars to use. It is especially helpful if you are using an off-axis guider though a scope with a long focal length as guide stars can be very hard to come by. The ones you do find, could be too dim for the color camera. That is were the mono camera far exceeds the color camera.

    Also, when planetary imaging. The mono version will detect more detail because all of the camera's pixels are recording for each color and luminence. In a color camera, your pixels are split up recordering different colors which makes the color camera a lot less sensitive to the planets details overall.

    The benefit of the color camera over the mono camera is *only* that it records in one shot color making is simple to use. Outside of that benefit, the mono is superior though it is more work when doing planetary imaging.

    I own a color camera, but will be purchasing a mono version. That said, I won't be giving up my color one once I have my new mono camera.

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    Default Re: To wait or not to wait....for a used ASI120mm

    The QE of the MM peaks at 75% at 550nm. The MC peaks at 68%. 10% difference. The net effect for guiding is minimal with short FL guide scopes. I've tried them both. YMMV with longer focal length scopes (like say 500mm+).

    The QHY5L-ii mono uses the same sensor as the MM(Aptina MT9M034 mono) but the MC uses Aptina AR0130CS sensor whereas the QHY5L-ii OSC uses the RGB version of the MT9M034.

    To see a significant difference in planetary imaging quality MM vs MC requires a high resolution scope - C9.25 upwards. If you have that sort of setup then the MM+wheel will be better (but of course more complex to operate and process).

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    Default Re: To wait or not to wait....for a used ASI120mm

    Quote Originally Posted by Phil Leigh View Post
    To see a significant difference in planetary imaging quality MM vs MC requires a high resolution scope - C9.25 upwards. If you have that sort of setup then the MM+wheel will be better (but of course more complex to operate and process).
    That is good to know. Currently, I will be auto-guiding for wide-field astrophotography with ed80tcf and planetary with my C-8. Sounds like the asi120mc would be a good choice. That will save me a few $$ to put towards a 50mm guidescope.
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    Default Re: To wait or not to wait....for a used ASI120mm

    Well, after a long day of reading reviews, studying photos on astrobin, scouring the net for the best deal, 3 Coors and a shot of Fireball, I pulled the trigger and ordered the ASI120mc and the orion 50mm guidescope. I think I make my best decisions after a few cocktails. Hey, it is how I met my wife 10 years ago! More to come.
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