You will see dimmer stars in the same field of view with that additional magnitude that will make whatever you’re looking at look really nice. It'll boil down to personal taste and preference. I can’t exactly argue with that – but there’s a fine balance between the two aphorisms. Going from a 5-inch (130mm) to an 8 (203mm) will get you a full magnitude deeper because it’s just a shade more than a 50% increase. With that said, what's the difference in accessories? Apertura AD8, HighPoint DT8, and Zhumell Z8 are all currently unavailable. Press J to jump to the feed. And how much additional costs will I have? Any help would be appreciated, after doing all of this research it appeared that the Zhumell and Apertura were the two most recommended and both are unavailable, and I was taken aback by the high price of the Orion Skyline relative to other 8" dobsonians. Just enough so it provides good quality for a beginner. This is because stars are a point source of light: no matter how much or little magnification you use on a star, a star will always be a point source, a dot through your eyepiece. This is based on the severity of the other four factors beyond the first one: maybe your optics are collimated well, but not perfectly; your optics aren’t as clean as when they left the factory, or maybe you scratched ’em up a bit the last time you cleaned ’em (oops); your aging eyes just ain’t what they used to be, etc. You’re observing from a truly dark site that lets you get all the way down to 6th magnitude, no humidity or water vapor, and no dust or other particulates in the air (smog, wildfires) to diminish that; Your optics are collimated perfectly, so that all the light is getting to your eyeball, and there’s no stray light entering the tube from off to the side of what you’re observing to diminish contrast; There are no scratches or significant dust on any of your optical surfaces that would diminish or scatter light; in other words your optics are practically pristine; Your eyes are in excellent shape – no astigmatism or other visual aberrations (other than near- or far-sightedness; the scope acts as your glasses in those two circumstances), you don’t have cataracts or yellowing of your eye lens, your pupils dilate nice and wide; you have all the rods you’re supposed to have on your retina to detect light under low-light conditions, meaning, you’ve eaten all your carrots so that your night vision is good. I read the sticky, but unfortunately 3 of the recommended 8" are unavailable. As we have talked …the way to increase your scope performance is with EAA. But the Skywatcher S11610 comes with a 9×50 finderscope, is it really much worse than the 8x50 with the Skyline? “Extended object” means anything that isn’t a star – anything that’s larger than a single point source of light, which includes, of course, nebulae, galaxies, and globular clusters. If you’re observing from the suburbs where you’re under 4th mag skies, then the 8-inch will only let you see down to 11.5. Obviously, it only really works if the place you keep the scope and the place you’ve gotta get the scope to, to observe, are both relatively on the same level. It’s not for me because I’m already deep into middle-age, I’ve always been a deskbound nerd, I never work out, I’m outta shape, and as weak as I am now, I want a scope to last me for the rest of my life, not something I’ll use as a gym substitute. Brightness is measured logarithmically, just like sound is. Vega is obviously brighter, but does it look over 6 times as bright? The magnitudes provided are under optically perfect conditions all the way around. See? The brightest stars are 1st magnitude, even zeroth (0th) magnitude, like Vega, which is defined as being magnitude 0.0 (it’s actually 0.03). It looks like the finder scope is a pricy one, as getting the Skyline's is about $100. To explain this, let’s discuss magnitude. The choice between Dobsonian models is usually based on the accessories bundled with it. Orion’s Intelliscope versions of each of these apertures weigh basically the same, as do Skywatcher’s dobs. The AD8 might be available at some point in the future but not right now. He has now moved to Denver, partially to alleviate that light pollution problem. It also lacks the SkyWatcher's bundled 10mm eyepiece, even though any of the EPs included with any of the scopes aren't worth writing home about. Yes, you read that correctly. Yet! Just to move scopes around. Let’s first take a look at the weight differences between two popular lines of 8 and 10-inch dobs. 3 magnitudes is 2.512 cubed = 15.8 times brighter. A one magnitude difference at the eyepiece will let you see a ton more dimmer objects that the smaller aperture won’t let you see, as I’ll discuss below. Where the hell did I get the name Shaula from? Point sources are stars, double stars, open clusters, and to some extent, globular clusters. For sure , as we age, our eyes change chemically and that detracts from our ability to decern contrast. Picture this. The dimmest stars you can see with the naked eye are around 6th magnitude – and that’s under perfectly dark skies (far, far away from any light pollution), with good, sharp eyesight (if your vision isn’t sharp, the dim light from a 6th magnitude star will blur into the background), good night vision (eat your carrots), good dark adaptation (up to half an hour without looking at any white light sources), as well as good, steady, stable, still, and dry and clear atmospheric conditions (no dust, no wildfires, and relatively low humidity). Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. Adhara is in Canis Major. Orion’s XT8, probably the most popular 8-inch dob out there, is 41 lbs., which breaks down almost exactly evenly between the tube and the base at about 20 1/2 lbs. ( Log Out / The Orion Skyline 8 is now up to $550, so I'm questioning if that's still a good value relative to other much cheaper 8-inch telescopes. The 12-inch will let you get down to 14.4, and that’s almost an entire magnitude deeper. Change ), Jon is a former attorney who formerly lived in Manhattan, who enjoyed using his 5-inch Mak there under the world's worst light-polluted skies. ( Log Out / Yet even something as bright as the Triangulum Galaxy (M33), which has an integrated magnitude of 5.7 is a difficult catch – even out there – because that magnitude is spread out from a point source to almost a full square degree.