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Thread: Digital eyepiece

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    Default Digital eyepiece



    I have a Celestron NexImage 5MP. I cannot for the life of me figure out how to use this thing. I can find the moon, and I can sometimes get lucky on finding a planet.

    If I stick my 9mm lens in, I can find things with no issues. No matter where I put them in my field of view, I absolutely cannot find them in the camera once I swap them out. When I put the 9mm back in after seeing nothing in the iCAP software, it is right there in my field of view. I've tried moving the focuser all the way in and out while the camera is in, but I cannot pickup anything. I've also adjusted the exposure from a second down to 1/60 of a second and it makes no difference. Also, the Gain, up and down.

    No stars, no planets! Why can't I even see stars as I traverse the cosmos with my telescope? Is 5MP not sharp enough? The bigger question here is why can I not see Jupiter in my camera when I can clearly see it in my 9mm eyepiece? I can sometimes move my scope around a bit and find it, but it is never where I left it in my eyepiece.

    I just feel like I'm doing something wrong, and would appreciate any help. I played with it for 2 hours the other night and I made 1 solid capture of Jupiter, but that was it in the entire 2 hours of playing.

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    Default Re: Digital eyepiece

    What kind of scope are you using?
    Mary


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    Default Re: Digital eyepiece

    Celestron 114LCM f/9 reflector.

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    Default Re: Digital eyepiece

    It would be helpful if you list your equipment in your signature.

    Get a cheap 25-32mm plossl EP and a parfocal ring. During the day focus the scope with camera on a distant object (top of radio tower/light pole) and do not move the scope or the focus, use the focus lock if you have one. Make sure the object is centered in the camera. Remove the camera and leave the set screw on the focuser loose. Put in the EP with the parfocal ring over the EP barrel. Without touching the focuser knobs, slightly lift the EP while looking through it until it comes into focus on the distant object and tighten the parfocal ring there so the EP sits in the focuser at it's focal point. Take note of where in the field of view the object is now at. Hopefully it is close to center. Now when you want to use your camera, you focus on your target with this EP and it's already very close to focus with your camera. Try to place your target in the same area of the field of view that the distant object was at so that it's on/near your target. The field of view with your camera will be much smaller than this EP.

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    Default Re: Digital eyepiece

    Quote Originally Posted by Ozman13 View Post
    Get a cheap 25-32mm plossl EP and a parfocal ring. During the day focus the scope with camera on a distant object (top of radio tower/light pole) and do not move the scope or the focus, use the focus lock if you have one. Make sure the object is centered in the camera. Remove the camera and leave the set screw on the focuser loose. Put in the EP with the parfocal ring over the EP barrel. Without touching the focuser knobs, slightly lift the EP while looking through it until it comes into focus on the distant object and tighten the parfocal ring there so the EP sits in the focuser at it's focal point. Take note of where in the field of view the object is now at. Hopefully it is close to center. Now when you want to use your camera, you focus on your target with this EP and it's already very close to focus with your camera. Try to place your target in the same area of the field of view that the distant object was at so that it's on/near your target. The field of view with your camera will be much smaller than this EP.
    Interesting. I understood most of that, and I looked up the rest. I understand the selling point of a parfocal ring, but I cannot seem to figure out what it does. Online, it says that it prevents you from having to adjust the focus when switching eye pieces, but how does it work? Do you attack it to the smaller focused EP and it prevents you from having to move the focus around, since the EP is sitting up higher on the focal barrel?

    Regardless, I have no issues at all finding things with my EPs. My issue is that I can swap out all of my EPs and the objects stay in the center of my field of view, for the most part. However, as soon as I switch to my camera, there is nothing at all in my screen. I can move it around and eventually find the object that I was looking for, but I am confused as to why my camera is so different than my regular EPs. I am concerned that the actual physical camera is miscalibrated somehow and pointing in a different direction than straight.

    I have a 25mm EP with a relatively small viewing angle, and a 15mm EP with a 66 degree viewing angle. I typically use the 25 to locate distant things, and the 15 to really center something. If I am going to be using the camera, I then switch out to the 9mm and center it and focus it there, as NexImage states that this camera is approximately the same FOV as a 9mm EP. However, it becomes a bit of an issue with the camera seemingly pointing in a different angle, because the orientation of the camera matters, wheras the orientation of the regular EPs does not. Therefore, I never know which direction my objects will be hiding off camera. I'm actually working to sort this out by marking myself an arbitrary "up" position for my camera so it is always pointing the same direction.

    I don't like to make assumptions, so my first instinct is that I was doing something wrong with the camera and wanted to come here and talk to those who have much more experience than I do. If I were to assume anything, it would be that the camera should point perfectly straight just like the 5 EPs that I have, is that correct?
    Scope: Celestron 114LCM f/9 Reflector Eyepieces: Stock 25mm & 9mm; Astromania 15mm 66-degree Ultra Wide Angle
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    Default Re: Digital eyepiece

    The function of the parfocal ring is to have two EPs or an EP and camera that come to focus at different points in your focus travel come to focus at the same point so that when you switch from one to the other, you do not have to refocus.

    Some of these small chip cameras have the center of their field of view different from the center of field of view of an EP, especially a high power EP, so the target can be lost. It doesn't have an adverse affect on the performance of the camera, it's just inconvenient. It may be easier to use the low power EP. With a parfocal ring attached, you can be sure to place the EP in the focuser oriented the same way every time. Take notice of where the target is in the low power EP compared to when it is centered in the camera. Always use the same orientation when using the camera to keep things consistent.

    Make sure the gain is turned up on the camera, once your target is found, you can turn the gain down.

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    Default Re: Digital eyepiece

    Quote Originally Posted by Ozman13 View Post
    The function of the parfocal ring is to have two EPs or an EP and camera that come to focus at different points in your focus travel come to focus at the same point so that when you switch from one to the other, you do not have to refocus.

    Some of these small chip cameras have the center of their field of view different from the center of field of view of an EP, especially a high power EP, so the target can be lost. It doesn't have an adverse affect on the performance of the camera, it's just inconvenient. It may be easier to use the low power EP. With a parfocal ring attached, you can be sure to place the EP in the focuser oriented the same way every time. Take notice of where the target is in the low power EP compared to when it is centered in the camera. Always use the same orientation when using the camera to keep things consistent.

    Make sure the gain is turned up on the camera, once your target is found, you can turn the gain down.
    High gain may be the tip I was looking for. I've been playing with Gain and Exposure when using the camera. I got some cool shots of Jupiters 4 biggest moons the other day by messing with them, and I was beyond excited. The next time I get out to look at the stars, I will mark my camera in some way so that way I can orientate it properly everytime. I have some ideas, but wanted to come to the community first. Once I mark it, I can figure out exactly where the objects are in reference to how my camera is facing. If I know that they are always just out of view in the bottom right corner, then they will be much easier to find.

    I was reading online that anything higher than a 5MP camera was mostly a marketing thing and that they didn't really help when looking through a telescope. Is this true? I couldn't find many people who used 8MP+ cameras that were claiming that they were better than the 5MP. All I could find were the people saying that 5MP was the best and everything else sucked.
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    Default Re: Digital eyepiece

    Quote Originally Posted by slwtx1983 View Post

    I was reading online that anything higher than a 5MP camera was mostly a marketing thing and that they didn't really help when looking through a telescope. Is this true? I couldn't find many people who used 8MP+ cameras that were claiming that they were better than the 5MP. All I could find were the people saying that 5MP was the best and everything else sucked.
    If these were customer reviews you are speaking of, you can throw that out the window. The number of pixels is not so important as the size of the pixels and the size of the imaging chip. If you are considering a new imager, ask the members here about a specific camera they would recommend and you will do a lot better than speaking with any vendor or reading any customer reviews.

    For imaging the planets, I use a simple webcam that may be as high as 1MP and I've done some pretty impressive stuff with it.
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    Default Re: Digital eyepiece

    Quote Originally Posted by slwtx1983 View Post
    celestron 114lcm f/9 reflector.
    ottimo

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    Default Re: Digital eyepiece

    Quote Originally Posted by armando View Post
    ottimo
    What does ottimo mean?
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