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Equipment Discussions >> Reflectors

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David PavlichAdministrator
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Reged: 05/18/05

Loc: Mandeville, LA USA
Re: Does your reflector give "refractor like" images? new [Re: GOLGO13]
      #5778243 - 04/04/13 06:07 PM

Quote:

I think one thing that is often overlooked is comparing apples to apples quality levels between reflectors and refractors.




Very common. I always question when someone wants to compare a basically handcrafted refractor to an off the shelf Newt or SC and do it in an apples to apples context. And 9 times out of 10, it's comparing planetary views. That's fine if all you do is look at Jupiter and Saturn and the Moon, but that 10" off the shelf Newt is a big winner when you compare it to a 4" top shelf refractor when looking at NGC891.

David


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Daniel Mounsey
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Reged: 06/12/02

Re: Does your reflector give "refractor like" images? new [Re: jnewton]
      #5778749 - 04/04/13 10:55 PM

Quote:

I am curious on this topic as I sometimes see that claim by scope makers. I am especially curious as to honest opinions regarding the <f/4 large dobs. We all know you get a brighter image and can see more, but does anyone feel that you get as crisp an image as an APO?




In some cases they actually can, but if you want a view that's more often like a refractor, then you'll just need to get a refractor. BTW, that's the short version.


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Daniel Mounsey
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Reged: 06/12/02

Re: Does your reflector give "refractor like" images? new [Re: Starman1]
      #5778773 - 04/04/13 11:14 PM

Quote:


Nah, 12.5" will ALWAYS show more.








Oh really, how about Collinder 70 Don.


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okieav8rModerator
I'd rather be flying!
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Reged: 03/01/09

Loc: Oklahoma!
Re: Does your reflector give "refractor like" images? new [Re: David Pavlich]
      #5778789 - 04/04/13 11:23 PM

Quote:

Quote:

I think one thing that is often overlooked is comparing apples to apples quality levels between reflectors and refractors.




Very common. I always question when someone wants to compare a basically handcrafted refractor to an off the shelf Newt or SC and do it in an apples to apples context. And 9 times out of 10, it's comparing planetary views. That's fine if all you do is look at Jupiter and Saturn and the Moon, but that 10" off the shelf Newt is a big winner when you compare it to a 4" top shelf refractor when looking at NGC891.

David




I agree David. Due to a reflector's low cost per inch of aperature, I'm going to employ the light gathering capability of a big newt every time when it comes to looking at faint objects like distant galaxies. Observing such objects are where big reflectors really shine. On the other hand, I love the views of open clusters and rich field views of the Milky Way that I get with my 4" refractor. Different uses for different scopes.

Edited by okieav8r (04/05/13 09:58 AM)


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Jon Isaacs
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Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: Does your reflector give "refractor like" images? new [Re: jgraham]
      #5778808 - 04/04/13 11:37 PM

Quote:

The image through the unobstructed refractor is just so darned clean. You can also easily max-out the exit pupil without having to dodge around the shadow of the secondary.




It's F/8... if your NEwtonian were F/8...

Jon


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Starman1
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Reged: 06/24/03

Loc: Los Angeles
Re: Does your reflector give "refractor like" images? new [Re: Daniel Mounsey]
      #5778890 - 04/05/13 01:20 AM

Quote:

Quote:


Nah, 12.5" will ALWAYS show more.








Oh really, how about Collinder 70 Don.



Or Kemble's Cascade, or Collinder 399 (The Coathanger), or..., or..., or...
So THAT'S why they made the NP101!


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Sean Puett
Carpal Tunnel
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Reged: 09/06/10

Loc: always cloudy, washington
Re: Does your reflector give "refractor like" images? new [Re: Starman1]
      #5779075 - 04/05/13 07:58 AM

NP 101 was made for guys with large reflectors. It is the perfect companion to a large reflector. It does well everything that a large reflector does not. The np127 is even better but, twice the price or so.

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azure1961p
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Reged: 01/17/09

Loc: USA
Re: Does your reflector give "refractor like" images? new [Re: Sean Puett]
      #5779081 - 04/05/13 08:02 AM

I agree . A refractor capable of low power wide fields is the perfect compliment to a large scope . In my case, large is 8" so 70mm fits the bill perfectly

Pete


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Ed D
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Reged: 04/30/10

Loc: Sunny South Florida
Re: Does your reflector give "refractor like" images? new [Re: azure1961p]
      #5779235 - 04/05/13 09:40 AM

I couldn't agree more. In my case it's a 6" f/8 Dob and a 72mm f/6 refractor , and throw in my 8x56 binos for good measure .

Ed D


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Mike B
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Reged: 04/06/05

Loc: shake, rattle, & roll, CA
Re: Does your reflector give "refractor like" images? new [Re: Ed D]
      #5779343 - 04/05/13 10:42 AM

Quote:

NP 101 was made for guys with large reflectors. It is the perfect companion to a large reflector.




In my case they're a 15" & a WO ZS66 'fractor .



Fine companions!


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bherv
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Reged: 03/10/06

Loc: WMass
Re: Does your reflector give "refractor like" images? new [Re: Mike B]
      #5779535 - 04/05/13 12:31 PM

My reflectors: 16" f4.5, 8" f/6 and 5" f/5. My refractors: 4" f/9.8, 80mm f/5.6 and a handful of 60mm's.
Barry


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jgraham
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Reged: 12/02/04

Loc: Miami Valley Astronomical Soci...
Re: Does your reflector give "refractor like" images? new [Re: bherv]
      #5779596 - 04/05/13 12:55 PM

"It's F/8... if your NEwtonian were F/8..."

Hmmm, wellll, I've made dozens (yes dozens) of Newtonians from f/3.7 to f/10. My pair of biggos are a 16.5" f/6.5 and a 16" f/4.5. What I wasn't expecting from my 6" f/8 achro is how well it performs as an RFT. Prior to this my favorite was my trusty olde 6" f/4. The little f/4 is still one of my favorite compact scopes. I often sweep the sky with it craddled in my arms.

What a neat time to be an amateur astronomer!


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Sean Puett
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Reged: 09/06/10

Loc: always cloudy, washington
Re: Does your reflector give "refractor like" images? new [Re: jgraham]
      #5779937 - 04/05/13 03:39 PM



What a neat time to be an amateur astronomer!




This is what I say. Has there ever been a time with so much affordable quality astronomy gear? No. Scopes that some of us complain about would have cost a fortune 100+ years ago. And before that, you had to be nobility to afford a telescope. Now we reflector vs refractor and apo vs achro to death. Sorry for sidetracking the thread but, we are the most fortunate amateurs and some of us do not realize it.


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