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Thread: TeleVue 0.8X Reducer/Flattener on a 8SE/C8 Scope?

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    Default TeleVue 0.8X Reducer/Flattener on a 8SE/C8 Scope?



    I have seen some pretty terrible effects that come from the Celestron f/6.3 reducer and I saw in another forum a comparison of the different reducers on the C8 scope.

    The comparison can be found here Sorry if I am not supposed to post links of different places =/

    There are some pretty interesting results from this test and now I was thinking about getting a TV 0.8 reducer for my 8SE Scope =).

    Has anyone done this? Do I need a different T-Adapter? and where can I get those?

    Thanks!

    Mike
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    Default Re: TeleVue 0.8X Reducer/Flattener on a 8SE/C8 Scope?

    Hey Mike,

    I just stumbled upon your thread, and was disappointed to find out that you still didn't get any replies yet. I found the results in that reducer/corrector test interesting though. To bad they didn't test the FR I'm using.

    I'm presently using an old 1984 Meade 2080 8" SCT with an Antares f/6.3 focal reducer, and Meade standard T-Adapter...and getting HORRIBLE results in the corners of my images!

    My spacing is about 110mm with this setup. Which from my understanding is about where you want it for the Celestron FR (although with the results you're getting, as well as the results from the test, I'm not sure if any spacing will work perfectly with this FR?). There is not much information available on the Antares FR that I'm using. But from what I was able to gather the ideal spacing for this brand is 83mm. Unfortunately, I can't achieve this short of spacing with my Meade T-Adapter. So I haven't been able to test it out. I can add spacers to increase my spacing, but I can't reduce the length from it's stock size. I've been contemplating getting a Celestron FR to see if it would give me better results than the Antares FR. But after reading those test results I'm not sure if that would be a wise idea.

    Sure would be nice to go to a star party where every brand FR, and T-Adapter, was available for testing!

    Good luck finding the answer to your questions.
    Mark :0)

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    Default Re: TeleVue 0.8X Reducer/Flattener on a 8SE/C8 Scope?

    Interesting - I'd kind of given up any hope of DSO imaging with my C8 as I now think of them as great at planetary imaging and/or visual, but just a royal PITA for DSOs.

    Televue does a make a reducer for 800-1000mm focal length, and there's also the Astro Physics CCDT67 which was designed for Maks or long focal length refractors. People use the latter quite often with Ritchey-Chretiens.

    Another way to look at though is for you guys using DSLRs, that a huge amount of surface area to illuminate. What if you cropped your images down some - or used a smaller chip? Would you still be as dissatisfied with the results from the normal reducer/flatteners?

    For CCDs, the sensor sizes are often so much smaller that I wonder if a lot of the garbage around the edges would simply not matter?
    Dan

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    Default Re: TeleVue 0.8X Reducer/Flattener on a 8SE/C8 Scope?

    Quote Originally Posted by dkordella View Post
    Interesting - I'd kind of given up any hope of DSO imaging with my C8 as I now think of them as great at planetary imaging and/or visual, but just a royal PITA for DSOs.
    LOL...I'm starting to feel the same way!

    They aren't bad for small objects that you can keep in the center of the frame. But for larger objects like NGC-281 they're a nightmare...and you can forget about attempting any DSO mosaics (unless you want to do a LOT of cropping). I'd like to try out a decent CCD camera, but at $2000 I don't know if it's worth the risk?

    I still would like to try playing around with the spacing a bit more on mine to see if it helps any. Maybe reducing my spacing from 110mm to the recommended 83mm will be just the ticket for my Antares FR?
    Mark :0)

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    Default Re: TeleVue 0.8X Reducer/Flattener on a 8SE/C8 Scope?

    An 8in SCT is "Just what the Doctor Ordered" for most of the Open Clusters and Globulars and Planetary Nebulae which adorn Messier's and Caldwell's lists.

    It's rather Slow compared to most Imaging Scopes, but the Focal Length brings out much of the Structure visible in these DSOs.
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    Default Re: TeleVue 0.8X Reducer/Flattener on a 8SE/C8 Scope?

    I agree with seigell. Even though my workhorse scope is my TV85, with the .8x reducer/flattener, I get some awesome shots with my C8/EOS60Da. The details you can get with the longer fl are very well worth it for nebula's and galaxies. Heck, even shot the inner parts of M31, and couldn't believe the detail! Granted, you can't get the entire M42 in the FOV, but what you can get in there makes a nice image. I've never tried putting my .8x reducer/flattener on my C8, because I have the .7x for the EDGE, so I can't help you with that.
    Just my 2 cents worth!
    Tom

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