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Thread: Barlows … Cameras … and Scopes

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    Angry Barlows … Cameras … and Scopes



    On a whim I bought a very small 80mm GoTo Orion scope, used, but never used if you know what I mean. Actually I was just thinking it might make a fun little spotting scope. It's simple, with three eyepieces, a moon filter, and a tripod. The view is clear but there are no bells and whistles. I like bells and whistles, but truthfully, this little scope feels like a toy. I'm a semi professional photographer with my latest camera being a Canon 5D3. I always buy expensive glass when I purchase lenses for my camera. So I have a keen eye for quality. Not to mention I'm a stickler for tack sharpness. I prefaced this for a reason…. so now on to the point.

    I regularly photograph the moon for television stations and for print with my Canon camera equipment. My preferred camera and lens when shooting the moon is a Canon 7D with 300 mm lens on a heavy duty 3258 Manfrotto tripod. I find this combination does an excellent job. A couple of days ago I started thinking... why not use the the little scope to try and fetch a moon image. It sounded good so I bought the EOS kit from telescopeadapters.com and the kit was in my mailbox in 2 days. And yes, the whole time I'm thinking this little scope will never support the weight with all that gizmo attached. And it doesn't! So I engaged a Manfrotto 681B monopod to support the camera. The scope eyepiece port angles beautifully to the left and there is no stress on the scope from the camera's weight. I'M READY NOW! At least I thought I was ready. NO FOCUS AT ALL! Not even with the extra T-adapter the company said I would need. NOTHING but a blur of light that would not focus no matter how much I tweaked the tubes.

    The next day I ordered a TeleVue 2X Barlow and it was delivered as expected in 3 days! I couldn't wait to insert the special tube and place the 6.3mm eyepiece in for some real close up stuff. NOTHING BUT A BLUR! I contacted Orion and they said the other two eyepieces, a 10mm and 20mm, were better suited for this scope. WHAT? Nowhere did I read anything but salvation about a 2X Barlow. I found a few negative articles about 3's and 4's, but NOTHING negative about a 2X Barlow. I did my homework and opted to purchase the TeleVue and not the Orion shorty because I thought the glass might be better. To check better you actually have to pull something into focus, however, when coupled with the 10mm and the 20mm the TeleVue 2X Barlow gives me NOTHING BUT A BLUR!

    Now I know astrophotography is complex. A lot of the photography I do is complex. I am used to complex, but jeez, nothing is working here.
    What am I doing wrong? Is the little scope just not worthy? What in the world, I mean what in the universe, is happening here?

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    Default Re: Barlows … Cameras … and Scopes

    Welcome to the forum. Photography is not my strong point, so I'll leave it for someone who knows what's what.
    In the meantime it wouldn't hurt to browse the Astrophotography section.
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    Default Re: Barlows … Cameras … and Scopes

    Thank you for the welcome. Simply and sincerely, I appreciate it!

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    Default Re: Barlows … Cameras … and Scopes

    Welcome!

    The basic problem is that the scope was not designed with a camera in mind. An eyepiece looks at a focal point in front of it. A camera needs to have the focal point insiide it, so the camera needs to sit a lot farther forward. Unless the focuser is specifically designed with this range of movement in mind, it will not be able to accommodate the camera.

    To move the camera forward enough to get the focal point inside it, you might want to remove the diagonal. That will mess up your delicate two-tripod balancing arrangement, but a counterweight on the front of the scope might solve that.

    Often a barlow will solve the back-focus problem, but there are no guarantees. In your case, obviously it doesn't.
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    Default Re: Barlows … Cameras … and Scopes

    KeithBC. Hello my new friend!

    Even with the camera out of the picture (pun intended) this scope will not focus
    with the Barlow. Take the Barlow out and place the eyepiece in the original port
    and the scope works. Why is that?

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    Default Re: Barlows … Cameras … and Scopes

    I don't know why you are having trouble this was done with a 60mm cheap celestron refractor. the items I used was a nikon L18 coolpix , Parks Silver Series 1.25" 20mm,
    Celestron Digital Camera Adapter Universal. No barlow or special adaptive lens I got a more detailed pic somewere but I need to find it.


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    Default Re: Barlows … Cameras … and Scopes

    Welcome to the forums.
    Is this the 80mm GoTo you purchased?
    Which of the Canon kits did you get from telescopeadapters.com? I use 2 inch UtraWide Prime Focus with my 5DMkII to reduce vignetting.
    If you picked up the kit with a long tube and are using it, you may be too far out to get focus. Try using fewer parts so it's shorter.
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    Default Re: Barlows … Cameras … and Scopes

    It sounds as if your focuser doesn't have enough inward travel. Use the Barlow with the 20mm and try to focus on (ever more) nearby objects. If you eventually achieve focus then your focuser can't move inwards enough. This happens for instance if the barlow can't sink deep enough in the drawtube/diagonal. My guess is that without the diagonal the problem will disappear.

    Can you post a pic of the scope with the barlow and an eyepiece inserted?
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    Default Re: Barlows … Cameras … and Scopes

    Hello Dormammu, pederv and Ruud!
    Thanks for the welcomes!

    The scope is not the one you highlight. It's more of a pre-beginners model if you know what I mean. As soon as I learn the fancy way you
    guys highlight I'll reach a more specific level of communication.

    Nice pic Dormammu. I had a 32%'er on the air a couple nights ago.

    Ruud. Can't right now but will ASAP!

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    Default Re: Barlows … Cameras … and Scopes

    If this is the scope then I can see why Keith said it may not work with your camera.
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