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01/14/2003 03:31:13 PM · #1 |
ok,
i just saw the second lunar landscape .... someone care to tell me how big your lense has to be to be able to frame the moon almost fully
cause i don't have one that big .. must be a male jealousy thing !
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01/14/2003 03:39:34 PM · #2 |
It is the dof that is hard to do well. eh4?
Message edited by author 2003-01-14 15:42:18.
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01/14/2003 03:40:33 PM · #3 |
heheh.
I think we're talking telescopes here. Have a root through the forums, there was a thread about telescope mounts last week.
If you need more info I'd wait till next week when the peeps who took the shots will be free to talk about them.
And yes, I'm feeling under-endowed (in the lens department) too ; )
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01/14/2003 03:56:03 PM · #4 |
See my shot of Jupiter last week, which did brilliantly well at 3rd last, lol.
This was taken through an 8 inch reflecting telescope at about 150x magnification. It`s not the 8 inch mirror that gives the manification its the eypiece used.
I have an 1200mm scope. So with with a 10mm eyepiece gives 120x mag.
The usefull limit for any telescope is 50x mag for every inch of aperture.400x for my scope.
The moons a piece of cake compared to jupiter.
Message edited by author 2003-01-14 16:44:11. |
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01/14/2003 04:00:58 PM · #5 |
You could try a high crop factor dSLR with a 400 to 600mm tele, with one or two teleconverters. But the shutterspeed must be fast as the moon moves relatively fast, especially when you zoom in like that.
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01/14/2003 04:54:54 PM · #6 |
| I've managed a resonable 'full image' shot of the moon at 640x640, cropped from an image shot on a D60 with a cheapo 300mm lens - so that's an effective 480mm or so. |
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01/14/2003 05:08:24 PM · #7 |
Just curious, 1200mm scope with a 10mm eye piece = 120 x mag. Is this why a 300mm lens on a 35mm film camera will get you close to 10x maginification? If not, what maginification do you get with a 300mm. Is there an easy conversion rule of thumb? Let's get Morgan on this, he's our resident tech guru :)
Originally posted by marbo:
See my shot of Jupiter last week, which did brilliantly well at 3rd last, lol.
This was taken through an 8 inch reflecting telescope at about 150x magnification. It`s not the 8 inch mirror that gives the manification its the eypiece used.
I have an 1200mm scope. So with with a 10mm eyepiece gives 120x mag.
The usefull limit for any telescope is 50x mag for every inch of aperture.400x for my scope.
The moons a piece of cake compared to jupiter. |
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01/14/2003 05:13:01 PM · #8 |
Doesn't this depend on how close you are standing to the moon :- ) I always heard that if you don't have a big lens than you should get closer to your subject.
T
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01/14/2003 05:29:16 PM · #9 |
Magnification of a telescope. I think it works the same for 35mm cameras.
Telescope focal length
---------------------- Divided by
Eye Piece Focal length
= magnification.
so...
300
--- divided by
35
= 8.6 X magnification. |
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01/14/2003 05:36:50 PM · #10 |
Originally posted by Gordon:
I've managed a resonable 'full image' shot of the moon at 640x640, cropped from an image shot on a D60 with a cheapo 300mm lens - so that's an effective 480mm or so. |
Would be nice to see what (for example) a Oly 2100UZ can do with an Eagleeye 5x. Or even better, an eagleeye 5x + Oly B300 1.7x. I read on the eagleeye website that that gives a 35mm equivalent of 3230mm.... No joke!
The eagleeye alone will give 1900mm.
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01/14/2003 05:40:50 PM · #11 |
Not sure about the camera side of things but, magnification is calculated by dividing the telescope's focal length by the focal length of the eyepiece. So, 1200mm/20mm = 60 x power. A 12mm eyepiece yields a higher magnification of 100 x. (1200mm/12mm = 100 x)
It you were closer to the moon you would just have to use a larger mm eyepiece to fill the same amount of view. |
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01/14/2003 05:44:26 PM · #12 |
Bear in mind the Moon is getting farther away by 3.8 centimeters per year.
So you better hurry if you want to get a shot. |
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