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  1. #21
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    exactly, the focal ratio can be summed up as "amount of light per second".
    A f/2 has more light per second than an f/6. This means that your eyes will gather more light for observing and your camera will get more light per second so you will need less time for your exposure to be on. Less exposure time = more pictures/less time taking pictures

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  3. #22
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    But all of celestron's SCTs have only a focal ratio of f/10 which makes them low scopes. are they still good for planetary viewing?

  4. #23
    jginglis423's Avatar
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    They are excellent for planetary viewing, but not for faint objects such as nebula, galaxys, and some star clusters..... and most of the interesting objects in the sky, in my opinion, are the nebulas and galaxys

  5. #24
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    You're kidding jginglis - f/10 is great for nebula and star clusters are amazing and really resolvable - mine is anyway.
    Galaxies are a bit faint, but they do get to be seen on a good dark sky.
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  6. #25
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    Hi, and welcome to the forums! Take it from me, I've found a plethora of information on this site!

    Given your budget, you can get the "Holy Grail" recommendation of beginning telescopes with the goto computer you're looking for: the Orion XT8g is available for $850. For $100 past your budget you can get the XT10g.

    You will have absolutely no complaints with either of these scopes when it comes to aperture size (at least not for awhile). Being a Dobsonian, you won't be doing much with it in the way of astrophotography, but visually it cannot be beaten for the price. Your other concern will be portability, with the XT8g coming in at 53 lbs. and the XT10 at 68 lbs.

    No matter which scope you get, the oft-quoted phrase always applies: "the best scope to buy is the one you will use."

    Orion SkyQuest XT8g GoTo Dobsonian Telescope

    Good luck with your future purchase(s)!

    Allen

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  8. #26
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    So is an SCT good for planetary [I]and[I] nebulae/galaxies/star clusters? thanks for the suggestion porkchopsisgood, I'll look into those two. But im still not sure whether to get a Dob or a SCT. I'm compiled a list of things that i would need for a celestron C6 SGT so im kinda leaning towards that. But i still have some more research to do so that's not final.

  9. #27
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    Oh and i was wondering if a canon 40d can be used for astrophotography and whether it'll fit on Celestron's T-ring and T-adapter.

  10. #28
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    Quote Originally Posted by Ychen View Post
    So is an SCT good for planetary [I]and[I] nebulae/galaxies/star clusters? thanks for the suggestion porkchopsisgood, I'll look into those two. But I'm still not sure whether to get a DOB or a SCT. I'm compiled a list of things that i would need for a celestron C6 SGT so I'm kinda leaning toward that. But i still have some more research to do so that's not final.
    I have a 8in SCT ..Great for planets ...Mine has 2000mm focal length so i can get close to the planets ..And i can use a focal reducer to get a shorter focal length which is a wider field of view ..Like nebula's and DSO's ...But if it were between a 8in. DOB and a 6in SCT i would get the DOB Aperture rules when it comes to scopes ...Espically when you want to look at DSO's or nebula's ...
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  11. #29
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    Quote Originally Posted by Ychen View Post
    Oh and i was wondering if a canon 40d can be used for astrophotography and whether it'll fit on Celestron's T-ring and T-adapter.
    You have to use a celestron adapter with a canon T-ring ..They will thread toghether ...And mate the camera to the scope ..
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  12. #30
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    See that's what's frustrating to me, Celestron has the Nexstar 8SE with an altazimuth single fork mount but the C6 SGT has a german equatorial mount. I want to be able to do some astrophotography but I've heard that the altazimuth mount isn't very suitable for it.

 

 
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