6" Newt or 6" Newt Astrograph for Galaxy imaging?

[TheButcher]

Hey all,

I keep changing my mind. Before I was thinking of upping my Mount (Which I will do Eventually and still may do initially). But it will take some selling off a bit and mainly my New 183mm-Pro camera and my 10" Dob, and the 183mm is kind of growing on me with its different capabilities then the 1600mm-p. I also was looking at the 6" GSO RC for a possibility. Now after reading some info, it seems like my AVX Mount optimal FL capabilities (with out pulling my hair out) should be less then 700 or 800mm for DSO imaging?

Anyway I am all over the place, but my goal is just to get a larger scale image of galaxies with the best bang for the buck, then my 80ED 500mm F6.25 can offer mounted on an auto guided AVX mount. Now using Astronomy.tools I was comparing an Aperatura 6" Newt @F5 to an Aperatura 6" newt Astrograph @ F4. The Astrograph image scale is makes the image a bit bigger then my 80ED Refractor but the Cheaper 6" newt @F5 shows a bigger difference.

Now keep in mind I plan on using my ZWO183mm-Pro mainly for these. But will also use my 1600mm-Pro with it at times, but my filter wheel has 1.25" filters in it. Now would that cause vignetting at F4 if I get the Astrograph 6" Newt? I heard that 1.25" filters can be used only down to a certain F Number? This is just in case I decide to sell off the 183mm-P .

Also besides a shorter Focal length and lesser imaging time, what other benefits would the 6" Astrograph offer that the 6" Newt can't do? I am not worried about the cost, the 6"Newt is $200 and the Astrograph is $300 and an 6" RC is $400.

Thanks all

[Lady Fraktor]

If this is strictly for imaging the RC will always out perform the standard Newtonian.

[TheButcher]

Thanks Lady Fraktor

It will be for strictly imaging and I guess with that said, what kind of reducer would I need for it to work well with the AVX Mount?

[Lady Fraktor]

That question would be best answered by the people using an RC, hopefully they will give you the information right away.

[JayTee]

This is the only reducer you should consider, the Astro-Physics CCDT67. This will bring the 1370mm focal length of the 6" RC down to roughly 920mm. This is what I use and so do many others. https://optcorp.com/products/astro-phys ... 6QQAvD_BwE.

Cheers,
JT

[sdbodin]

You will have to remember that to image with a Newt, you will need a coma corrector also $200 or so. My personal belief is that the RC is the best bet. And you can shoot without the reducer at first as opposed to the Newts that absolutely require the corrector. That optical design was made for photography from the start, in the '30s or '40s if I remember correctly, probably not, memory is the second thing to go. I wouldn't worry about that f9 speed. I shoot at f10 quite often and find that exposures in my normal range of hour to hour and a half are just fine with my 1600 chip.

Good luck,
Steve

[TheButcher]

Thanks all for the help. I think I am settled on the RC.

[TheButcher]

Well I changed my mind again, but still on the route of getting an RC. I just sold the 183mm-p and got the Skywatcher EQ6-R Pro today the latest version with USB on the mount and on the HC. So now after I sell my Dob and AVX I think I will shoot for the 8"RC.

[yobbo89]

Nice, what camera will you use to image now?

[TheButcher]

Nice, what camera will you use to image now?

I kept the 1600 and I ended up selling the 183 to help fund the mount, I figured the 1600 was more versatile.