[Stanescu Octavian]

pai eu pozez luna si planete cu focar de 7500 cu pixel de 4,7 microni al DSRL si nu tuseste cipul .pozele ce ies au fost postate pe forum .

[psemil]

Ei haideti ... discutia aceasta cu DSLR nu are final... Din punctul meu de vedere dslr este slab; sunt constient ca o camera astro color ar aduce un plus si sunt foarte sigur ca una A/N ar fi mult mai sensibila avand si plusul rezolutiei.
Ceea ce a spus Tavi Stanescu anterior ilustreaza cel mai bine utilizarea dslr in astronomie.

[nobody]

Atentie, la fotografiile planetare se schimba datele problemei !

MTF-ul este de alta natura si permite folosirea unui oversampling agresiv.
Luminoziteatea este de mii de ori mai mare si permite pierderea cauzata de difractie.
Iar la final, stacking-ul poate face minuni la un seeing slab.


Planetary Pixel Size

In this case, oversampling is a good thing. Some sensitivity is lost, as explained above, but then again the planets are about 1000 to 2000 times brighter than an average 10th magnitude galaxy. Also, oversampling provides more information which can be extracted later using advanced image processing techniques.

A recommended resolution for planetary imaging is 0.25"/pixel. This is much easier to achieve than trying to obtain the proper pixel resolution for deep-sky imaging. For deep-sky you are pretty much limited to the focal length of the telescope being used. With planetary imaging, it is a simple matter to change the focal length by using a Barlow lens, or by using eyepiece projection.
...
http://starizona.com/acb/ccd/advimagingdetail.aspx
http://starizona.com/acb/ccd/advimagingplanet.aspx

[auriga]

ref. la pixel size are si nenea Jerry un articol: http://www.astropix.com/wp/2011/03/01/sampling-and-pixel-size