Dobsonian 8/10 inch. Eyepieces and barlow lens questions? - dobsonian 8
Hello, I'm thinkig or 8inch zhummel dobsonion Dobson / Orion, or 10 inches.
What would the eyepiece of the telescope more than one without those who have become a big blur? and what would be one of the telescopes on top of these skills?
I was thinking about buying a 6.4 mm eyepiece of a telescope and possibly a barlowx2. Was it a good idea? it would be too much work for one of these options for telescopes?
In any case, these proposals are Energy Eye and Barlow lenses, etc., my viewing experience with Mars, improving the Moon, Jupiter, Venus, Saturn, galaxies, etc.
All opinions and help is greatly appreciated.
Friday, February 19, 2010
Dobsonian 8 Dobsonian 8/10 Inch. Eyepieces And Barlow Lens Questions?
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4 comments:
The rule of thumb: an increase of 50-60 times over the opening (in inches) on the resolution of the telescope. That would then mean something 500x INCHER for his 10th In practice, increases of over 200, maybe 300, not viable, because the atmosphere and the stability of the position and the small size of the field.
A 10 "f/4.5 Dobson is usually with a focal length of 45". The 6.4 mm eyepiece would be an increase of 178th I suggest that would be a 2x Barlow lens + 6.4 mm, it will be very useful. If you are really crazy with a little more like cracks double stars or the fine details of the planet in better conditions, then you can try a 4mm eyepiece.
Short focal length eyepieces have a puppy from a very lowHe and the eye relief that their application difficult, especially for beginners. With a Barlow helps with injury time, but the picture quality is still suffering a bit. Superior quality of the eye may also provide greater relief from his eyes.
Go for the 10-inch Orion. There's nothing like Orion customer service if you need help after the sale.
Is not recommended, a Barlow. Adding more glass adds more distortion. It is always a matter of personal taste --- I had hated a good Barlow. I sold it to a man in our club, and he loves it.
Go to the eye instead of a Barlow.
★ I am recommending you to a local astronomy club or astronomical society. When you join a club you can join some of their star parties and their members can contribute face-to-head with its scope and show you how to get the most out of your new room, and help teach, where the treasures in heaven . Most clubs have areas ready and extensive libraries, which receive more information abouto. Most clubs have been monthly meetings with members of the briefing by the members and guest speakers. You can really learn a lot from the clubs and more are added all the great friends you made there. Go to this site to find a club near you. http://www.astroleague.org/societies/lis ...
This is only clubs from the National League of astronomy, there are many more that are not on this list. Also, the Google search engine, if you do not see one here in your area.
★ Do not try to learn everything at once, or you will be excited and discouraged. Patience is the key to astronomy.
★ You have a good program to map and the stars.
http://www.stellarium.org/
This free software is great that you can download. Suchl is the place where you and tell you what you see. We ask that if something is, and will show you. I wish him good
Both the first 2 answers are great, grow only in a few points.
Not join an astronomy club, with a maximum increase would be 300X decent mirror in a good night
where the atmosphere is turbulent. Wherever I live in the northeastern U.S.
the air is very unstable in general and it is rare that I can push to increase 200X.
Glasses that come with the scope, is now in order. Let's update the time if I keep an eye on the first one to get now is a mid-range (eg about 17mm focal length)
The hardest part is finding the objects. Normally, the scope comes with software that can find objects by star charts. There are few books that I recommend. Star Watch by Phil Harringtonexcellent resource, and
The deep sky introduction of Phil Harrington is also an excellent book.
You mentioned that you have 8 inches or 10 inches. I have also heard, and I recommend the 10-inch, if you can afford. There is a subtle but significant difference in the ability to collect light, but the 10-begins to show details in galaxies could not see in an 8 inch.
In case no one has mentioned, I buy a Telrad finder, what a view of a bull of heaven, and there are many free web Telrad maps.
Clear sky.
The rule of thumb: an increase of 50-60 times over the opening (in inches) on the resolution of the telescope. That would then mean something 500x INCHER for his 10th In practice, increases of over 200, maybe 300, not viable, because the atmosphere and the stability of the position and the small size of the field.
A 10 "f/4.5 Dobson is usually with a focal length of 45". The increase would be 6.4 mm eyepiece to 178. I suggest that would be a 2x Barlow lens + 6.4 mm, it will be very useful. If you are really crazy with a little more like cracks double stars or the fine details of the planet in better conditions, then you can try a 4mm eyepiece.
Short focal length eyepieces have a puppy from a very lowHe and the eye relief that their application difficult, especially for beginners. With a Barlow helps with injury time, but the picture quality is still suffering a bit. Superior quality of the eye may also provide greater relief from his eyes.
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