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Aperture of ISO telescope 
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#1
May612, 01:01 PM

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a bit random to this but could any of you give me an example aperture for a telescope collecting ISO farinfrared radiation. (to assist a theory about Andromeda)



#3
May712, 11:23 AM

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The aperture (light/radiation gathering area in meter squared) of a telescope collecting ISO Farinfrared radiation :)



#4
May712, 03:27 PM

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Aperture of ISO telescope



#5
May912, 11:36 AM

P: 9

The Aperture is different for every telescope depending on what radiation it is gathering, i kneed to know an aperture for a telescope gathering ISO Farinfrared radiation.



#6
May912, 01:00 PM

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If not then I am confused by your question also??? 


#7
May912, 03:07 PM

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#8
May912, 06:40 PM

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I've moved this discussion to a new thread, since it's not really related to Astrophotography.
According to Wikipedia, the ISO has an aperture of 60 cm. 


#9
May1012, 06:08 PM

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Also, try researching/googling "resolving power" of a telescope.
The ability for a telescope to resolve two objects of an given angular distance is a function of the telescope's aperture. It is also a function of the wavelength of light being observed. This is the result of diffraction. The detail is proportional to the aperture, and inversely proportional to the wavelength. Putting it a different way: The bigger the aperture, the smaller the diffraction. The bigger the wavelength, the bigger the diffraction. Resolving power can be expressed as [tex] \sin \theta = 1.220 \frac{\lambda}{D} [/tex] Where [itex] \theta [/itex] is the minimum angular separation in radians, [itex] \lambda [/itex] is the wavelength of the light, and [itex] D [/itex] is the telescope's aperture. And since [itex] \theta [/itex] is bound to be small for any practical telescope application, you might want to make the approximation (for small [itex] \theta [/itex]), [itex] \sin \theta \approx \theta [/itex] Although the above is fine and good, it really represents the maximum resolving power. Other factors such as atmospheric "seeing" can reduce the effective resolution (for Earth based telescopes) to something worse than what is given above. 


#10
May1112, 11:03 AM

P: 9

@collinsmark Many thanks for you reply and also understanding the question unlike some :)



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