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jerry32
member


Reged: 10/30/10

Waht scope is better?
      #5556029 - 12/05/12 05:16 PM

So i have a co-worker who is debating between these 2 scopes.
http://www.celestron.com/astronomy/celestron-c8-sgt-xlt.html
http://www.celestron.com/astronomy/celestron-c10-ngt.html

The use would be AP and General observing in mildly Light polluted area.


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drewp
professor emeritus
*****

Reged: 05/19/07

Loc: 41.5 deg north moline ill
Re: Waht scope is better? new [Re: jerry32]
      #5556044 - 12/05/12 05:26 PM

for ap the c8 would be better on the cg5 mount than the giant wind sock called the c10n. the c10 on a cg5 is imo too much weight on that mount. the c10 would be better for visual.

Edited by drewp (12/05/12 05:28 PM)


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Bob Griffiths
Getting Grouchy
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Reged: 10/10/05

Loc: Frederick Maryland
Re: Waht scope is better? new [Re: drewp]
      #5556086 - 12/05/12 05:59 PM

I agree with drewp... the C10 newt is one BIG scope and a Cg% mount just is not up to teh task even in a very slight breaze..

The difference visually is honestly not a heck of a lot..mostly the Newt would give you a brighter view and a wider FOV..both noticeable enough difference to come close to being a WOW what a difference BUT not

I admit that I am a Sct and Refractor guy and have now owned a Newt of any kind in over a decade..

Bob G


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Ed Whitney
sage


Reged: 07/08/10

Loc: Palm Coast, Florida
Re: Waht scope is better? new [Re: drewp]
      #5556099 - 12/05/12 06:06 PM

The C8 is better, but you will need a F/6.3 FR-FF for AP to correct for the serious field-curvature SCT's have.

But, this could be a tough choice for you because the 10in scope "can" reveal delicate pastel colors in Jupiter and details in Mars that the C-8 can't for visual. The 10in newt is perhaps the max weight the CG-5 can carry, but it will shake some. The other poster is right about the wind causing you some real aggrivation when taking pix.

The C-8 is better suited for AP with a CCD or DLSR camera, while the newt may be better with a web cam where you can stack pix and remove the unwanted frames.

Essentially, in MHO, a 10in dob is better suited for reflectors. The Alt-Az mount is rock solid holding the tube and it's more easily transported and set up than the C8 on a CG5.

Clear Skies!


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panhard
It's All Good
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Reged: 01/20/08

Loc: Markham Ontario Canada
Re: Waht scope is better? new [Re: Bob Griffiths]
      #5556167 - 12/05/12 06:40 PM

The 8" is the way to go.

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jerry32
member


Reged: 10/30/10

Re: Waht scope is better? new [Re: panhard]
      #5556228 - 12/05/12 07:12 PM

ok so hes leaning towards the 8 inch but hes wondering if his camera
http://www.dpreview.com/products/sony/compacts/sony_dschx200v

can be used to do some AP? If it is what adapter will he need..

thanks all


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lamplight
Carpal Tunnel
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Reged: 09/18/12

Loc: western MA, U.S.
Re: Waht scope is better? new [Re: panhard]
      #5556240 - 12/05/12 07:18 PM

I have that 10",Reflector. First thing I had to do was spend a lot more$ on asturdier mount. Even for visual Weare talking 15+ seconds for it to stop shaking after a focus adjustment. WITHOUT any wind.

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panhard
It's All Good
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Reged: 01/20/08

Loc: Markham Ontario Canada
Re: Waht scope is better? new [Re: jerry32]
      #5556253 - 12/05/12 07:26 PM

If you don't get a reply to the question about the camera and adapter soon ask that in one of the imaging forums. ok

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jerry32
member


Reged: 10/30/10

Re: Waht scope is better? new [Re: panhard]
      #5556279 - 12/05/12 07:37 PM

Quote:

If you don't get a reply to the question about the camera and adapter soon ask that in one of the imaging forums. ok




thanks will do


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rdandrea
Carpal Tunnel
*****

Reged: 06/13/10

Loc: Colorado, USA DM59ra
Re: Waht scope is better? new [Re: jerry32]
      #5556386 - 12/05/12 08:37 PM

"Better" is subjective. However, I think that a 10" steel-tube Newt might be pushing the CG-5. It will handle the weight (barely) but the moment arm of the big scope will make the mount a little fidgety. I have the C8-NGT and I would not want to go longer and/or heavier.

Also, even my 8" requires three trips out of the house to set up (four if you count a trip for my eyepiece case, flashlight, etc.) One for the mount, one for the counterweights, and one for the OTA. I think it might be easier to haul out the SGT, and the best scope is the one you use most often.


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S.Boerner
sage


Reged: 04/29/10

Loc: Eastern Missouri
Re: Waht scope is better? new [Re: rdandrea]
      #5556416 - 12/05/12 09:02 PM

I did a quick scan for the Sony camera manual and don't think it has a lens that can be removed. If he can't get the lens off the camera he's going to be stuck doing afocal if he wants to use his scope. Google afocal to get an idea of what that means.

IF he can get the lens off the camera he'll need a t-mount adapter for the camera and then either a 2" or 1.25" nose piece that will allow the camera to mount to the scope's focuser. Go to agenaastro.com and search for "nose piece" and you'll see what I mean.


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Erik30
member


Reged: 10/16/12

Loc: Cottage Grove, MN
Re: Waht scope is better? new [Re: S.Boerner]
      #5556425 - 12/05/12 09:07 PM

I have that Sony camera, the lens is not removable.

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Pharquart
sage
*****

Reged: 11/11/09

Loc: Southwest Minneapolis Metro
Re: Waht scope is better? new [Re: jerry32]
      #5556430 - 12/05/12 09:09 PM

Quote:

ok so hes leaning towards the 8 inch but hes wondering if his camera
http://www.dpreview.com/products/sony/compacts/sony_dschx200v

can be used to do some AP? If it is what adapter will he need..

thanks all




I wouldn't recommend that camera for AP. From what I can see, the lens on that camera is fixed. That is, you can't take it off and replace it with a different lens.

There are 2 types of astrophotography: prime focus and afocal. With prime focus, the camera itself doesn't have a lens, but rather uses the telescope as its lens. Instead of a lens, the camera gets an adapter that fits into the focuser of the telescope (the camera becomes an eyepiece). Most "good" astrophotographs are done this way.

Afocal photography can be done by anyone with any camera. In afocal mode, you simply hold the camera up to a regular eyepiece and take a picture. The camera replaces your eye at the eyepiece. It's very hard to hold the camera exactly in the right spot to get a good view with no vignetting (getting a smaller than normal view). There are adapaters like this one to help. These clamp onto the eyepiece and provide a mount for the camera. These work pretty well with basic point-and-shoot cameras. The particular camera you list looks fairly large. The weight might be a problem. Also, the lens on that camera sticks out a long ways, which might be out of the adjustment range of the mount.

For photography of planets, basic imagers use a webcam adapted to mount in the focuser. They then take videos (lots of pictures), select the ones that are sharp in focus (which varies from frame to frame due to atmospheric turbulence) and stack the frames to get a composite shot.

Brian


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