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Equipment Discussions >> Cats & Casses

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m00nless
sage


Reged: 08/06/08

Maksuton-Newtonian vs Schmidt-Cassegrain
      #5644005 - 01/26/13 09:16 AM

How would a SkyWatcher 190mm f/5.3 Maksuton-Newtonian compare to a Celestron 200mm f/10 Schmidt-Cassegrain?

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microstar
Pooh-Bah


Reged: 01/05/08

Loc: Canada
Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: m00nless]
      #5644083 - 01/26/13 10:09 AM

Are you doing astrophotography? If so the Mak-Newt wins hands down. My SW 190MN is my main astrophotography workhorse. Very flat field and sharp stars to the edge of field while still reasonably fast and a FOV suited to a wide range of deep sky objects. I rarely observe with it visually so will let others comment on visual use.
...Keith


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coopman
Post Laureate
*****

Reged: 04/23/06

Loc: South Louisiana
Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: microstar]
      #5644159 - 01/26/13 10:51 AM

I would take the MN any day over a SCT. I do visual only.

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m00nless
sage


Reged: 08/06/08

Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: coopman]
      #5644313 - 01/26/13 12:28 PM

No astrophotography for now. Would there be a real reason to switch to a MN from a SCT for visual?

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JohnH
Carpal Tunnel
****

Reged: 10/04/05

Loc: Squamish BC Moved!!!!!
Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: m00nless]
      #5644381 - 01/26/13 01:10 PM

Image scale is one reason I could think of, but the use barlows and short focus EPs level the playing field considerably.

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CottsModerator
Just Wondering
*****

Reged: 10/10/05

Loc: Toronto, Ontario
Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: m00nless]
      #5644411 - 01/26/13 01:29 PM

Visual only? The Mak Newt. The 190mm f/5.3 will have a much smaller central obstruction than the SCT - (around 20% rather than >than 30% for the SCT) which makes the changes to the diffraction pattern almost indistinguishable from an unobstructed telescope. Your planetary and Lunar viewing will be enhanced.

The f/5.3 focal ratio of the M-N will be better for wide field viewing than the f/10 of the SCT.

The two scopes are equally excellent for chromatic aberration.

I have an INTES 6" f/8 Mak Newt (16% central obstruction) which can run with any 6" refractor on the planet and is very much the equal of a 200mm SCT except for light grasp. The 190mm MN should be noticeably better than the 200mm SCT.

Dave


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HenryB
member


Reged: 01/11/13

Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: m00nless]
      #5644416 - 01/26/13 01:32 PM

The Mak-Newt gives a wider field and depending on what you observe, that may be an advantage. I have a 10" Mak-Newt and a C11 and enjoy both, but the wider field is nice on clusters.

Bryan


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Yu Gu
member


Reged: 06/18/06

Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: HenryB]
      #5644498 - 01/26/13 02:27 PM

I had both scope, as well as a TEC140 at the same time. The 190 was kept and the other two were sold. It's really a 185mm F5.4. The CO is 31% for the older version (mine) and larger for the newer ones. On my sample, the figure was exceptionally smooth and accurate, rivials any top maker. The planetary performance is a step above the TEC140, not to mention the light gathering. It's just not as beautiful a machine as a TEC. The C8 had an accurate but less smooth figure (due to high magnification of the secondary).

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rmollise
Postmaster
*****

Reged: 07/06/07

Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: m00nless]
      #5644566 - 01/26/13 03:01 PM

Quote:

No astrophotography for now. Would there be a real reason to switch to a MN from a SCT for visual?




The MNT is a fine telescope, but the SCT is a little more versatile. It works well at f/10, f/3.3, and f/6.3. It is as suited for high resolution planetary imaging as deep sky work. It's, very impotantly, got a short, relatively light tube that will not stress a mount. Finally, counteless accessories have been developed for the SCT over the last 40 years.


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NHRob
Post Laureate
*****

Reged: 08/27/04

Loc: New Hampshire
Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: rmollise]
      #5644625 - 01/26/13 03:46 PM

Yu Gu,
Which model 190 Mak-Newt do you have? Is it the Skywatcher brand?


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BillP
Postmaster
*****

Reged: 11/26/06

Loc: Vienna, VA
Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: Yu Gu]
      #5644665 - 01/26/13 04:15 PM

Yu Gu,

How did you find that the thermal issues differed between the SCT and MN you had? Was one faster to acclimate than the other?


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titanio
sage


Reged: 02/15/09

Loc: Alicante, Spain
Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: BillP]
      #5644702 - 01/26/13 04:43 PM

I prefer the MN to the SCT.
As for thermal issues, it is much better in my MN than in my C9 HD, the MN has a fan which make the telescope to be ready in a few minutes

Toni


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Yu Gu
member


Reged: 06/18/06

Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: titanio]
      #5644729 - 01/26/13 05:00 PM

The one I have is the white version. It has a removable door at the back. I typically use a fan to force air in from the back and keep the focuser end open for the air to get out. It works great! I typically set the scope out at sunset and let the fan run for an hour and I haven't had any thermal issue at all! (unlike many other scopes I had). I live in West Virginia and the temperature can drop pretty quickly at night. I can see white ovals on Jupitor consistantly with the MN190, which was not the case for TEC140. The only issue is that I have not yet had a success to get my Denk II working properly with this scope...

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laconicsax
super member


Reged: 10/05/10

Loc: Portland, OR
Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: Yu Gu]
      #5644788 - 01/26/13 05:31 PM

The Mak-Newt has more advantages over the SCT than the other way around. As long as you have a mount that can handle it, I'd say go with the Mak-Newt.

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Eddgie
Postmaster
*****

Reged: 02/01/06

Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: m00nless]
      #5644849 - 01/26/13 06:19 PM

The MNs have an excellent reputation as visual scopes but this is due to the fact that at f/6 the central obstruction can be kept very small.

The 190mm MCT you are looking at is sold usually as an astrograph, and while I could not confirm the Specs of the Skywatcher branded scope, the Orion 190mm f/5.3 has a rather large obstruction, which is almost always the case with astrographs.

The Orion version has a 64mm secondary obstruction so in fact, the secondary obstruction is about the same percentage (33%) as a C8.

And since a C8 has more aperture to start with, it should have a slight edge for deep sky and planets.

The MN will have the ability to provide quite a bit larger field, so will do better for large clusters and such, but there are not that many targets that won't fit into the field of a C8 with a 35mm Panoptic.

The MN also weighs in at a hefty 22 lbs. And being a Newt, it will not have the great ergonomics of a C8.

So, pick you posion. A larger field in a heavier (harder on the mount) and less ergonomic package (MN), or a compact scope that will do slightly better on planets and deep sky, will work on a light mount, and will have great ergonomics with an eyepiece that can always quickly be adjusted to the right angle.

Don't discount the ergonomics. This is the weak point of a GEM mounted Newt. Even if you have rotating rings, the eyepeice can sometimes get into uncomfortable positions. This is hardly ever an issue with a C8.

The question is do you mind the extra bulk and weight of the MN for the bigger field it can provide, or do you want the better deep sky and planetary performance that the C8 can provide.


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Jon Isaacs
Postmaster
*****

Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: Eddgie]
      #5644978 - 01/26/13 07:35 PM

Quote:

Don't discount the ergonomics. This is the weak point of a GEM mounted Newt. Even if you have rotating rings, the eyepeice can sometimes get into uncomfortable positions. This is hardly ever an issue with a C8.




In my experience, the ergonomics of an 8 inch F/5 Newtonian are still reasonable, seated viewing is possible even at the zenith. Effective rotating rings can be fashioned with some handiwork and Teflon.

In my mind, a standard Newtonian with a coma corrector is a worthy competitor to a Mak-Newt and has a few advantages such as fewer issues with dew, open tube promoting thermal equilibrium...

Jon


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maknewtnut
Member
*****

Reged: 10/08/06

Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: Yu Gu]
      #5645011 - 01/26/13 07:51 PM

My route to MN's was very similar to that of Yu Gu. I got my first because I couldn't afford a 4" apo to supplement my Ultima 8 (had my eyes on an AP Traveller at the time). It paid off. I then sold the MN56 and the C8 to obtain an MN76. That paid off too.

I later owned a TEC 140, and ran it side by side with the MN76. I sold that fine refractor too (because the advantages on both deepsky and high mag planetary were considerable).

The C8's attribute of size and weight is a very real issue to consider. However, trying to imply parity in image quality at faster focal ratios by simply screwing on a mass produced accessory is misleading. It has become widely accepted that quality will vary widely with C8's. What is not as widely known is that the same applies (if not more so) to the redcucer/correctors made for them.


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NHRob
Post Laureate
*****

Reged: 08/27/04

Loc: New Hampshire
Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: maknewtnut]
      #5645182 - 01/26/13 09:50 PM

Hi Mark,
Didn't I sell you that first MN56?
Wish I still had it.


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maknewtnut
Member
*****

Reged: 10/08/06

Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: NHRob]
      #5645229 - 01/26/13 10:39 PM

That's right Rob O.

I have another I built recently with Deluxe spec optics. I built it with a carbon fiber tube and Delrin primary cell and focuser block. Incredibly tight star images to very near the edge of the field at lower mags, and still sucks up magnification without flinching for planetary and double star observation....although I have to sell it because the stable is too full.

As for my previous post...Rod, sorry if it seems like I might pick on your replies now and then. The SCT is a good choice for many. However.....IMHO, playing them up as having no cons whatsoever is a gross disservice to those asking for opinions on the differences between them and other makes and/or design types. EVERY telescope has pros and cons, and attributes each person can weigh in level of importance to them.


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JohnH
Carpal Tunnel
****

Reged: 10/04/05

Loc: Squamish BC Moved!!!!!
Re: Maksuton-Newtonian vs Schmidt-Cassegrain new [Re: NHRob]
      #5645252 - 01/26/13 11:02 PM

Quote:

Hi Mark,
Didn't I sell you that first MN56?
Wish I still had it.





Vancouver Telescope has an MN 66 with test papers around. If they are selling it or its being spoken for are questions I cant answer


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