Quote:
Originally Posted by Mark_Heli
Hi Peter,
Thanks for the detailed response - much appreciated. In your experience with the ONAG, have you found that there are any limitations in the objects you can image using the ONAG because of the lack of NIR going to the imaging camera?
In reading up more on ONAG's today, I also came across Scott Rosen's website ( http://www.astronomersdoitinthedark.com/index.php) and he has taken some pretty impressive pictures with his ONAG.
Cheers,
Mark |
There is plenty of IR flux in almost all parts of the sky. If I compare an image through a blue filter and through a photometry I filter that samples in the near IR, the IR image will be brighter than the blue image. Except for the relatively rare very hot O, B or A class stars, all other stars have greater flux in the IR than in the visual. As the cooler stars are the most common then there are always stars visible in the IR for the guider.