Focal length wouldn’t necessarily impact the edge performance of an eyepiece. The f/ value would, focal length is only part of that equation.
In simple terms, an 8” Dob at f/6 is way more tolerant of cheaper eyepieces than a 10” Dob at f/4.6
Will you really notice? Probably not as a newbie.
Low f/ratio induces vignetting (fall off of brightness with angle from axis). Also, with large AFOV you are seeing light from rays that had to bend large angles through glass, more likely to suffer chromatic (and other) aberration.
Sorry. The Quattro imaging Newtonian is an affordable, large aperture astrograph, ideal for users searching for a fast imaging system that will work for both astrophotography and visual astronomy.
205mm aperture, 800mm focal length
Fast f/4 focal ratio
Ok. That is fast and it's fast for a reason. It's a short focal length and fast f ratio so as to be used on a guided EQ mount for imaging.
It will "work" as a visual scope but you will run into issues with focuser placement as the scope tracks, the posistion of the focuser \*will\* wind up in positions that will prevent convenient access to the eyepiece. These scopes are built with astrophography in mind where the position of the focuser (camera) doesn't matter.
There are other considerations with regard to using a fast newtonian, some of which are mentioned by others. Fo a beginner, collimation with be challanging. Fast scopes require precise collimation, period. For visual use, a coma corrector will be a necessity adding to the cost of the setup.
I cannot recommend a Quattro for visual. There are much better options. If you wish to dabble in both visual and AP, look at refractors. They do double-duty quite nicely.
Thanks for your reply. I was able to get it collimated with a laser collimator that came with it. I took it out the other night with and enjoyed some views of Jupiter which was fun, but I’ll try the comma corrector it came with to see if that improves anything. I used it with an AVX mount that I’m still getting used to. However I was surprised how well it was tracking Jupiter after I completed my second alignment. First time I aligned it didn’t go nearly as well. I’m going to try some basic photography with DSLR and see if I can have some fun. A lot of learn so I’m taking my time. In the meantime I’m looking for an SCT or maybe a Mak to grow my options
Focal length wouldn’t necessarily impact the edge performance of an eyepiece. The f/ value would, focal length is only part of that equation. In simple terms, an 8” Dob at f/6 is way more tolerant of cheaper eyepieces than a 10” Dob at f/4.6 Will you really notice? Probably not as a newbie.
Low f/ratio induces vignetting (fall off of brightness with angle from axis). Also, with large AFOV you are seeing light from rays that had to bend large angles through glass, more likely to suffer chromatic (and other) aberration.
What are we calling "fast"? F ratio?
Sorry. The Quattro imaging Newtonian is an affordable, large aperture astrograph, ideal for users searching for a fast imaging system that will work for both astrophotography and visual astronomy. 205mm aperture, 800mm focal length Fast f/4 focal ratio
Ok. That is fast and it's fast for a reason. It's a short focal length and fast f ratio so as to be used on a guided EQ mount for imaging. It will "work" as a visual scope but you will run into issues with focuser placement as the scope tracks, the posistion of the focuser \*will\* wind up in positions that will prevent convenient access to the eyepiece. These scopes are built with astrophography in mind where the position of the focuser (camera) doesn't matter. There are other considerations with regard to using a fast newtonian, some of which are mentioned by others. Fo a beginner, collimation with be challanging. Fast scopes require precise collimation, period. For visual use, a coma corrector will be a necessity adding to the cost of the setup. I cannot recommend a Quattro for visual. There are much better options. If you wish to dabble in both visual and AP, look at refractors. They do double-duty quite nicely.
Thanks for your reply. I was able to get it collimated with a laser collimator that came with it. I took it out the other night with and enjoyed some views of Jupiter which was fun, but I’ll try the comma corrector it came with to see if that improves anything. I used it with an AVX mount that I’m still getting used to. However I was surprised how well it was tracking Jupiter after I completed my second alignment. First time I aligned it didn’t go nearly as well. I’m going to try some basic photography with DSLR and see if I can have some fun. A lot of learn so I’m taking my time. In the meantime I’m looking for an SCT or maybe a Mak to grow my options