What is a common observational technique to obtain very deep images of the sky?
1. Replace film detectors with digital detectors
2. Use science-grade cameras
3. Obtain the average image from a large number of identical images of the same area of the sky
4. Obtain a color image
5. Use a science-grade flash
1. Replace film detectors with digital detectors
2. Use science-grade cameras
3. Obtain the average image from a large number of identical images of the same area of the sky
?……radio telescope lol?
All except #5. #4 is optional, since you can use colored filters on a monochrome camera and stack the resultant images to produce color – which how Hubble does it. Or use one shot color like on a DSLR.Monochrome cameras give you better overall detail.
http://hubblesite.org/gallery/behind_the_pictures/meaning_of_color/
You got me…I think it may useful for u.
http://l14.info/133698/film-detector