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| Tonight's Image; M42 The Orion Nebula | |
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| Tweet Topic Started: Nov 28 2010, 12:15 AM (459 Views) | |
| Piano*Dad | Dec 9 2010, 07:03 PM Post #26 |
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Bull-Carp
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Very useful information. Thanks. Why do you want such low magnification for deep space objects. Don't you want to magnify small galaxies to make them fill a bit more of the screen? Or do you just get a white blob that way? It sounds like we may need two more eyepieces right off the bat. A higher power than the 12mm 100X, and a lower power than the 28mm 43X. |
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| Mark | Dec 9 2010, 08:19 PM Post #27 |
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HOLY CARP!!!
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As you increase magnification you effectively increase the f-ratio/focal length which permits less light through to your eye as you increase these numbers. There is only so much light a given aperture can collect. When you exceed the limits of the aperture all you end up with is dim, fuzzy, blurry crap. |
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___.___ (_]===* o 0 When I see an adult on a bicycle, I do not despair for the future of the human race. H.G. Wells | |
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| dolmansaxlil | Dec 10 2010, 02:47 PM Post #28 |
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HOLY CARP!!!
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These are so amazing, Mark. I envy your talent at this (and your tenacity in capturing and processing the images!) |
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"Your first 10,000 photographs are your worst." ~ Henri Cartier-Bresson My Flickr Photostream | |
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| Mark | Dec 10 2010, 04:23 PM Post #29 |
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HOLY CARP!!!
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Thanks Dol! I envy your talent for terrestrial photography. You have "the eye". ![]() P*D, another note on why you cannot magnify deep space (or deep sky) objects very much... As you increase magnification as I stated earlier, you are effectively stopping down the telescope's aperture ( just like the aperture or f-stop in a camera) which darkens the field. When you are out hunting for 12th magnitude or higher objects you need as many photons hitting your rods and cones as possible to even discern the object from the background. Most of these objects are small although some can fill the view which can lead to not even seeing them at all as there is nothing in the field of varying contrast to allow your eye to discern any difference between the object and the background. Some of the galaxies can withstand a certain amount of magnification but their apparent brightness determines how much. A lot of the "faint fuzzies" actually cannot be viewed straight on but you have to learn to use averted vision where you see the object only when it is not centered in your vision. The "blinking planetary" is one such object but many share this characteristic. It's a game of patience with a small helping of madness thrown in. |
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___.___ (_]===* o 0 When I see an adult on a bicycle, I do not despair for the future of the human race. H.G. Wells | |
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| Piano*Dad | Dec 10 2010, 06:36 PM Post #30 |
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Bull-Carp
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I suspect the "faint fuzzies" won't grab P*S's attention right off the bat. We'll want to look first for the wow factor objects. What are the best "first" things to locate with this kind of scope? |
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| KlavierBauer | Dec 10 2010, 07:05 PM Post #31 |
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HOLY CARP!!!
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P*D: Is this his first scope? If he's anything like me - everything will inspire awe - to the point that family members will stop responding to the "come here and look at this!" shouts from the yard. The moon can be absolutely amazing with any optical device - it's so close, and so detailed, that it's just really fascinating to look at. It can be really really (dangerously) bright though. The sun is fascinating as well if you have the proper filters. Jupiter has always been a favorite of mine, but part of that is just me really loving Jupiter's mass/size, and its oddities (like Red and Red Jr.). You'll have a great view of its moons as well, which will be cool. Outside of our own solar system there will be plenty of "wow" objects to look at. Here's a list of non-Messier objects that was compiled in 2000 after a question on Usenet asked hobbyists their favorite objects for 8-12" scopes. |
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"I realize you want him to touch you all over and give you babies, but his handling of the PR side really did screw the pooch." - Ivory Thumper "He said sleepily: "Don't worry mom, my dick is like hot logs in the morning." - Apple | |
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| KlavierBauer | Dec 10 2010, 07:08 PM Post #32 |
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HOLY CARP!!!
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Of course, these will all be accessible to you too: Messier Objects |
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"I realize you want him to touch you all over and give you babies, but his handling of the PR side really did screw the pooch." - Ivory Thumper "He said sleepily: "Don't worry mom, my dick is like hot logs in the morning." - Apple | |
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| Piano*Dad | Dec 10 2010, 07:13 PM Post #33 |
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Bull-Carp
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Yes, this is his first scope. I had a 2" refractor "toy" when I was a kid. But he's 17 now and actually contemplating studying astrophysics or some flavor of aerospace engineering next year as he starts the university experience. Frankly, I bought more than the usual 'starter scope' for the average twelve year old. Since he is genuinely interested in astrophysics/engineering, I decided to go a little better than a tiny starter scope. As I mentioned earlier, I thought first about a 5" or 6" reflector. Then I realized that the kid is only here for about nine more months, and then the scope is going to sit with ...... ME. I too am interested in observing, and my budget is larger than his. Get my drift. Hence the 10" Dobson reflector with a computerized GoTo motor built into the mount. It should arrive in a week. Can't wait! |
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| KlavierBauer | Dec 10 2010, 08:00 PM Post #34 |
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HOLY CARP!!!
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Had I the $$ for a scope right now (still saving for drums!) That's *exactly* what I would be buying. I think every "local" object you look at is going to wow you both. And just the ability to see some deep space stuff is going to "wow" you even more. There are lots of Messier objects that should look pretty fantastic. Mark can answer better which specifically you might be able to see from your specific location (not sure of your "limiting magnitude," etc.). You're going to love this... |
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"I realize you want him to touch you all over and give you babies, but his handling of the PR side really did screw the pooch." - Ivory Thumper "He said sleepily: "Don't worry mom, my dick is like hot logs in the morning." - Apple | |
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11:06 AM Jul 11