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#1
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Upright image in reflector
Hi
I will be getting my first telescope soon. It will be an Orion SkyQuest XT8 Dobsonian. I have ordered a shorty+ barlow in addition to the included eyepieces. I知 thinking this telescope might also be useful for casual terrestrial observations as I have a very nice view from my terrace. A refractor is probably the best solution for this, but I am not planning to get one anytime soon. So, I was wondering, is there any usable solution to get an upright image in this telescope? Regards Athle |
#2
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Ducky wrote:
Hi I will be getting my first telescope soon. It will be an Orion SkyQuest XT8 Dobsonian. I have ordered a shorty+ barlow in addition to the included eyepieces. I知 thinking this telescope might also be useful for casual terrestrial observations as I have a very nice view from my terrace. A refractor is probably the best solution for this, but I am not planning to get one anytime soon. So, I was wondering, is there any usable solution to get an upright image in this telescope? Regards Athle There is this handy invertor that might help: http://tinyurl.com/awzkz - Alex P.S. (: tsiser t'ndluoc, yrroS |
#3
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Generally, Newtonians have a rather narrow FOV for use as a terrestrial
telescope. You CAN probably see an upright image if you move around the scope until the image looks correct. To get any decent FOV you would need a fairly low power EP, but since you would not be viewing at infinity, you probably could not get such an EP far enough out on the focuser to focus on a terrestrial object. Orion does have some pretty nice spotting scopes, I think that one of those would work much better and hurt your neck much less. Bill "Ducky" wrote in message ... Hi I will be getting my first telescope soon. It will be an Orion SkyQuest XT8 Dobsonian. I have ordered a shorty+ barlow in addition to the included eyepieces. I知 thinking this telescope might also be useful for casual terrestrial observations as I have a very nice view from my terrace. A refractor is probably the best solution for this, but I am not planning to get one anytime soon. So, I was wondering, is there any usable solution to get an upright image in this telescope? Regards Athle |
#4
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Alexander Avtanski wrote:
Ducky wrote: Hi I will be getting my first telescope soon. It will be an Orion SkyQuest XT8 Dobsonian. I have ordered a shorty+ barlow in addition to the included eyepieces. I知 thinking this telescope might also be useful for casual terrestrial observations as I have a very nice view from my terrace. A refractor is probably the best solution for this, but I am not planning to get one anytime soon. So, I was wondering, is there any usable solution to get an upright image in this telescope? Regards Athle There is this handy invertor that might help: http://tinyurl.com/awzkz - Alex P.S. (: tsiser t'ndluoc, yrroS Whee--That will help with extra oxygen to the retina too! |
#5
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I used to have a 6" Orion reflector many years ago. With a 25mm ep and
terrestrial viewing, I could get a nice image, albeit upside down, at about 3/4 of a mile. Anything closer than that was difficult to see. With a 40mm ep, I would "guess" your 8" would be effective for terrestrial at about the same or maybe a mile. Don't expect to see something in your backyard, unless you have a focuser that's 3 feet long, and you want to count the number of feathers on the left leg of a sparrow. Congrats on the new scope! -- Tom "Do, or do not. There is no try" (Yoda, 1980). "Ducky" wrote in message ... Hi I will be getting my first telescope soon. It will be an Orion SkyQuest XT8 Dobsonian. I have ordered a shorty+ barlow in addition to the included eyepieces. I知 thinking this telescope might also be useful for casual terrestrial observations as I have a very nice view from my terrace. A refractor is probably the best solution for this, but I am not planning to get one anytime soon. So, I was wondering, is there any usable solution to get an upright image in this telescope? Regards Athle |
#6
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On 2005-08-02, Ducky wrote:
I will be getting my first telescope soon. It will be an Orion SkyQuest XT8 Dobsonian. I have ordered a shorty+ barlow in addition to the included eyepieces. I知 thinking this telescope might also be useful for casual terrestrial observations as I have a very nice view from my terrace. A refractor is probably the best solution for this, but I am not planning to get one anytime soon. So, I was wondering, is there any usable solution to get an upright image in this telescope? The usual image erectors won't work because you don't have enough back focus. You could lie on your back and look up into the eyepiece, but that is a little awkward. Newtonians aren't much good as terrestrial telescopes: stray daylight reduces contrast and the magnification is way too much. A pair of seven power binoculars or a regular spotting scope (if more magnification is wanted) is better for daytime use. -- The night is just the shadow of the Earth. |
#7
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time to take your pill ...
Sam Wormley wrote: Alexander Avtanski wrote: Ducky wrote: Hi I will be getting my first telescope soon. It will be an Orion SkyQuest XT8 Dobsonian. I have ordered a shorty+ barlow in addition to the included eyepieces. I知 thinking this telescope might also be useful for casual terrestrial observations as I have a very nice view from my terrace. A refractor is probably the best solution for this, but I am not planning to get one anytime soon. So, I was wondering, is there any usable solution to get an upright image in this telescope? Regards Athle There is this handy invertor that might help: http://tinyurl.com/awzkz - Alex P.S. (: tsiser t'ndluoc, yrroS Whee--That will help with extra oxygen to the retina too! |
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