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Skywatcher newton

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paul16mj

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Minor Planet

Posts: 73

Joined: Mon Jan 18, 2016 9:17 am

Location: Netherlands breda (noord brabant)

Post Sat Jun 02, 2018 12:10 pm

Skywatcher newton

I narrowed down my decision to 2 scopes:

Sky-Watcher Quattro-10S f/4 250mm Dual-Speed Foto Newton https://www.robtics.nl/product_info.php?cPath=21_25_767_424&products_id=3810

or

Sky-Watcher Explorer-300PDS (OTA) 30cm Dual-Speed Newton https://www.robtics.nl/product_info.php?cPath=21_25_767_94&products_id=1807

But i wish to know the difference with the quattro scope and this one.

I have no idea what the quattro means
Bresser Pollux 150/1400
Skywatcher AZ-EQ6 GT
Canon 450d EOS (with adapter)
25mm plösl oculair
10mm plösl oculair
6mm Plösl Oculair
Sky-Watcher light pollution filter
Mannfrotto 290 light camera tripod (very good quality)
DSS and Registax
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gardenfish

Kiloparsec

Posts: 1055

Joined: Fri Feb 05, 2016 9:18 am

Location: Phoenix Az.

Post Sat Jun 02, 2018 6:29 pm

Re: Skywatcher newton

From what I see it is the focal length and f-stop. The Quatro has a smaller focal length but faster f-stop. So you can get a sub with less exposure times, but the other has a longer focal length so it is looking deeper in space.

I would suggest to use Stellarium. It is a free download if you do not already have it. In Stellarium you can input your sensor size and your scope size. When you do this you can select an object in the sky and then see what it will look like with the 1000mm or 1500mm focal length. Then you can decide which would be best for you.

If you have major light pollution like I do your lrgb pics will have a shorter sub time so the faster f-stop would help...the f4 Quatro. On Narrow band it wont matter as much so you can do longer or shorter exposure times which means you can choose either Focal length scope you want, which ever you like in Stellarium.

If you are doing color camera that is another discussion.


Rick
Takahashi TSA120 - SV70T
CEM60 - PierTech2 pier
QSI6120 WSG-8
Astrodon 31mm LRGB E Series -Ha-3nm - OIII-3nm - SII-3nm

G3 Mono - ASI290MM Mini - ST80

ES 152 AR - Atlas mount
16" goto Dob

Nikon D5200 Modded

Roll-off roof Observatory
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MikeM

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Magellanic Cloud

Posts: 1925

Joined: Thu Jan 29, 2009 6:24 am

Location: NJ, USA

Post Mon Jun 04, 2018 6:56 am

Re: Skywatcher newton

I believe the Quattro stands for nothing more than the F ratio - f4. There are a couple of pros & cons to each.
Quattro f4-
1000mm focal length
Fast f ratio which is good for imaging but difficult to collimate since the CFZ is narrower
10" scope weighs ~36.5 pounds (without imaging equipment) with approx 11.5 inch tube
Comes with a Vixen type dovetail which I believe is not sufficient for a scope of this size
300 PDS
F5 which produces 1500mm focal length - easier to collimate
Gathers 44% more light than the Quattro
May need a coma corrector ( so another optic to flatten the edges)
12" scope with ~14" tube; ~4 feet tall & weighs ~50 pounds without any accessories
Comes with Losmandy style dovetail

So while the 300PDS may be a tad slower in the F ratio department, the light grasp more than makes up for it. I think the main drawback of this scope is its unwieldy size and weight and as nice of a mount that you just acquired, I believe it is too much scope for it and your results may suffer. Last thing that one needs is more aggravation.
Of the two I would go for the Quattro even though I think that it will test your mounts limits. But you decide.
Clear Skies!
Mike

AT8RC -- FSQ-106N
G11
Atik 383L+ - EFW2 - OAG
Image
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paul16mj

User avatar

Minor Planet

Posts: 73

Joined: Mon Jan 18, 2016 9:17 am

Location: Netherlands breda (noord brabant)

Post Mon Jun 04, 2018 7:42 am

Re: Skywatcher newton

I saw people use the 300mm scope on an EQ6

So i thought the 250mm would be safe...

There also is a 250mm with an f/4 ratio and 1200mm wich costs 200 dollars less than the quattro.
Bresser Pollux 150/1400
Skywatcher AZ-EQ6 GT
Canon 450d EOS (with adapter)
25mm plösl oculair
10mm plösl oculair
6mm Plösl Oculair
Sky-Watcher light pollution filter
Mannfrotto 290 light camera tripod (very good quality)
DSS and Registax

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