Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Is 8" to 10" a big jump in aperture?

  • Please log in to reply
36 replies to this topic

#1 nickcodybarrett

nickcodybarrett

    Vanguard

  • *****
  • topic starter
  • Posts: 2011
  • Joined: 17 Apr 2016
  • Loc: Jackson, MS

Posted 21 January 2017 - 02:49 PM

Im very close to purchasing a 10" imaging reflector for visual, and want to know how big of a jump it is in detail, and limiting magnitude. Right know I have a 8" dob.

 

Thanks,

Nick



#2 Augustus

Augustus

    Fly Me To The Moon

  • *****
  • Posts: 8036
  • Joined: 26 Dec 2015
  • Loc: Connecticut

Posted 21 January 2017 - 02:51 PM

No. It's only a 1.5x or so increase.

 

You'd be much better off getting a 12" Dob for that price.


Edited by Augustus, 21 January 2017 - 02:52 PM.

  • Tarzanrock likes this

#3 Tarzanrock

Tarzanrock

    Aurora

  • *****
  • Posts: 4737
  • Joined: 07 Dec 2008
  • Loc: Los Angeles

Posted 21 January 2017 - 03:08 PM

Sound advice well given.  Get the 12 or go even larger to a 14 or more.



#4 nickcodybarrett

nickcodybarrett

    Vanguard

  • *****
  • topic starter
  • Posts: 2011
  • Joined: 17 Apr 2016
  • Loc: Jackson, MS

Posted 21 January 2017 - 03:12 PM

Well all I have is $1500 and go-to is my priority. I would get a 12 if I could but closest I can get is 10.



#5 csrlice12

csrlice12

    ISS

  • *****
  • Posts: 24771
  • Joined: 22 May 2012
  • Loc: Denver, CO

Posted 21 January 2017 - 03:13 PM

Why do you want to spend the bucks on a newt designed for AP to use it for visual?  You might find it can't come to focus with a lot of eyepieces without focal extenders.  As a norm, an AP scope is NOT an ideal visual scope....kinda like driving a Ferrari to the 7/11 at rush hour when all you need is the Toyota.


  • Jon Isaacs and Redbetter like this

#6 nickcodybarrett

nickcodybarrett

    Vanguard

  • *****
  • topic starter
  • Posts: 2011
  • Joined: 17 Apr 2016
  • Loc: Jackson, MS

Posted 21 January 2017 - 03:21 PM

Well it's the cheapest 10" ota I could find. Find me something cheaper than $600, and I'll take it no doubt.


  • clusterbuster likes this

#7 kfiscus

kfiscus

    Baltic Birch Dob Bases

  • *****
  • Vendors
  • Posts: 6614
  • Joined: 09 Jul 2012
  • Loc: Albert Lea, MN, USA

Posted 21 January 2017 - 04:05 PM

We can get you a Z12 for under $600 IF you lurk long enough and are willing to drive far enough...

 

Was a great deal for $475 but it was in Florida.


  • Jon Isaacs likes this

#8 havasman

havasman

    Cosmos

  • ****-
  • Posts: 9851
  • Joined: 04 Aug 2013
  • Loc: Dallas, Texas

Posted 21 January 2017 - 04:06 PM

Consider that they could've call their product anything they wanted and they called it an IMAGING reflector, likely for a reason. I suspect it may be a quite short focal length and, while it may work for visual astronomy, may also be compromised in some way if used for that purpose.

Counselling patience to a young man is a fool's game, I know. But holding your water and stacking your nickels a bit higher so you can make that step to a 12" aperture might really pay off in the long run. That step IS significant, for sure.

Regardless, your enthusiasm and continued observing is admirable and I, and certainly all of us, wish you the best in your development in the hobby. 


  • SeaBee1, Augustus, Redbetter and 1 other like this

#9 nickcodybarrett

nickcodybarrett

    Vanguard

  • *****
  • topic starter
  • Posts: 2011
  • Joined: 17 Apr 2016
  • Loc: Jackson, MS

Posted 21 January 2017 - 04:10 PM

I do like the Celestron avx series. I got to use the 6" newt version one night before and it performed as well as my 8. If I got the 8" version then it'd probably perform better than my dob.

 

I'd have room for accessories such as a much needed dew heater system.



#10 junomike

junomike

    Hubble

  • *****
  • Moderators
  • Posts: 16991
  • Joined: 07 Sep 2009
  • Loc: Ontario

Posted 21 January 2017 - 04:11 PM

In my location going from an 8" - 10" is significant and more noticeable than going from the 10" to 14" (or even 16").

YMMV.

 

Mike


  • Pinbout, mogur and nickcodybarrett like this

#11 Justin Fuller

Justin Fuller

    Messenger

  • *****
  • Posts: 495
  • Joined: 08 Jul 2012
  • Loc: Los Angeles, CA

Posted 21 January 2017 - 04:20 PM

Do you have an equatorial mount that can hold a 10" OTA? If I've read correctly, you've got the 8" Dob and have a budget of $1500; you may want to consider spending your money on a coma corrector and top quality eyepieces, there's still a lot you can pull out of your 8" before you move on to a new scope.


Edited by Justin Fuller, 21 January 2017 - 04:28 PM.

  • Jon Isaacs, Max T, havasman and 1 other like this

#12 nickcodybarrett

nickcodybarrett

    Vanguard

  • *****
  • topic starter
  • Posts: 2011
  • Joined: 17 Apr 2016
  • Loc: Jackson, MS

Posted 21 January 2017 - 04:39 PM

Well I've always wanted go-to.



#13 Garyth64

Garyth64

    Soyuz

  • *****
  • Posts: 3931
  • Joined: 07 May 2015
  • Loc: SE Michigan

Posted 21 January 2017 - 04:41 PM

Here on CN there's a couple of 10 inch scopes on hd mounts, if you want to go in that direction.  One is $700.  These are older classics.

 

There was also a 10 or a 12-1/2" Cave some where too. for $1100.


  • Augustus likes this

#14 Justin Fuller

Justin Fuller

    Messenger

  • *****
  • Posts: 495
  • Joined: 08 Jul 2012
  • Loc: Los Angeles, CA

Posted 21 January 2017 - 04:47 PM

Well I've always wanted go-to.

Ahh, I see. One option you have is to get just an equatorial mount (maybe something like the Orion Atlas EQ-G), some tube rings and dovetail and put your current 8" tube on it.


  • nickcodybarrett likes this

#15 Augustus

Augustus

    Fly Me To The Moon

  • *****
  • Posts: 8036
  • Joined: 26 Dec 2015
  • Loc: Connecticut

Posted 21 January 2017 - 04:48 PM

Well I've always wanted go-to.

You'd be better off with a used Schmidt-Cass for $1500.


  • Jon Isaacs likes this

#16 nickcodybarrett

nickcodybarrett

    Vanguard

  • *****
  • topic starter
  • Posts: 2011
  • Joined: 17 Apr 2016
  • Loc: Jackson, MS

Posted 21 January 2017 - 05:53 PM

Im not sure I like sct's that much. Im a reflector type of person. I like big aperture, and moderate wide fields. That's something a sct doesn't offer.

 

I've always considered taking the bearings off my 8 and putting it on an cgem, but I still want something easy to setup when I don't want to lug out a huge eq mount. 



#17 MrG

MrG

    Messenger

  • -----
  • Posts: 423
  • Joined: 01 Aug 2016

Posted 21 January 2017 - 06:46 PM

At least in the recent past, 8" reflectors tended to be f/6 while the 10" tended more toward f/4.5 or f/5.  So, the focal length was basically the same between them, but for various related reasons the 8" tended to have better optics - I've seen commercial 8" f/6 Meades which had absolutely awesome optics.  I don't recall ever saying the same about any mass-market 10".



#18 MrG

MrG

    Messenger

  • -----
  • Posts: 423
  • Joined: 01 Aug 2016

Posted 21 January 2017 - 06:49 PM

Indeed, the Orion site lists your 8" at f/5.9.   Going to a "faster" 10" will result in a lot more funny business in the eyepiece, especially if you don't have very fancy eyepieces.  I doubt you'd gain a thing, overall.


  • Jon Isaacs and Augustus like this

#19 nickcodybarrett

nickcodybarrett

    Vanguard

  • *****
  • topic starter
  • Posts: 2011
  • Joined: 17 Apr 2016
  • Loc: Jackson, MS

Posted 21 January 2017 - 09:07 PM

I just pulled the trigger on a celestron avx 8" Newtonian.


  • Cometeer and ram812 like this

#20 Achernar

Achernar

    Voyager 1

  • *****
  • Posts: 11336
  • Joined: 25 Feb 2006
  • Loc: Mobile, Alabama, USA

Posted 22 January 2017 - 11:30 AM

You would see a difference on faint objects that are close to the edge of visibility, but on bright objects the quality of one telescope's optics relative to the other would be more apparent. To get a large improvement on viewing fainter galaxies, nebulae and star clusters, you'll want a 12-inch or larger telescope. The gain in light grasp is about 50 percent, where as going to a 12-inch will be more than double the light grasp.

 

Taras



#21 Roger Corbett

Roger Corbett

    Viking 1

  • -----
  • Posts: 732
  • Joined: 07 Mar 2013

Posted 22 January 2017 - 11:52 AM

Let us know how it goes!



#22 ram812

ram812

    Viking 1

  • -----
  • Posts: 673
  • Joined: 10 Dec 2014
  • Loc: Grants Pass, Oregon

Posted 22 January 2017 - 12:13 PM

If it's just visual the AVX should handle the 8. I use a CGEM on a 10" reflector and visual is killer, however, photographically is pushing it, especially adding guiding, etc. Good luck on your new purchase and just have fun! :waytogo:



#23 CP Kuiper

CP Kuiper

    Surveyor 1

  • *****
  • Posts: 1836
  • Joined: 17 Jun 2015
  • Loc: Central Iowa

Posted 22 January 2017 - 12:16 PM

I just pulled the trigger on a celestron avx 8" Newtonian.

Hopefully, you're aware that a Newtonian on an EQ mount that doesn't have rotating OTA rings the focuser and finder of your new AVX mount w/8" Newtonian will get into some pretty uncomfortable positions for visual use.


  • Jon Isaacs and Augustus like this

#24 Jeff B

Jeff B

    Fly Me to the Moon

  • *****
  • Posts: 5990
  • Joined: 30 Dec 2006

Posted 22 January 2017 - 12:25 PM

 

I just pulled the trigger on a celestron avx 8" Newtonian.

Hopefully, you're aware that a Newtonian on an EQ mount that doesn't have rotating OTA rings the focuser and finder of your new AVX mount w/8" Newtonian will get into some pretty uncomfortable positions for visual use.

 

Yup indeed but there are inexpensive solutions for that which have been in several threads here.

 

The trouble is, the more slop in the ring system, the more you are prone to go to errors, even with modeling.  However you can mitigate that to a degree with tighter tolerances and using a good wide field finder eyepiece.

 

Jeff



#25 nickcodybarrett

nickcodybarrett

    Vanguard

  • *****
  • topic starter
  • Posts: 2011
  • Joined: 17 Apr 2016
  • Loc: Jackson, MS

Posted 22 January 2017 - 05:52 PM

My dad is very mad I got the 8 instead of a 10. He doesn't understand the cons of buying a 10. Someone list all the pros and cons of a 10, then the pros and cons of a 8. Then make your decision of what you would buy for the avx.

 

You'd be a huge help. Thanks


  • Augustus likes this


CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics