Originally posted by rawr I don't think that is a crop.
Atmospheric conditions etc make for the haze I expect. Urban Japan probably isn't the best place to do astro-photography.
Well, it most certainly is a crop - but a 100% crop without resizing. You may convince yourself as follows:
1. Jupiter currently has an angular diameter of 48 arcseconds (= 0.01333.. degrees).
2, The focal length of the system is 1600 mm
3. The imagesize on the sensor will then be
diameter = 2*1600mm*tan(0.01333/2)
= 0.372 mm (Note this ONLY depends on the actual focal length and has got noting to do with sensor dimensions and equivalent focal lenghts)
4. The sensor of the Q is a 1/2.3" which is 6.16 by 4.62 milimeters.
5. The sensor of the Q has 4000 * 3000 pixels which gives us a pixel witdth of
0.00154 mm and
6. According to 3. above the image size of Jupiter's diameter with this camera and set-up will then be
0.372/0.00154 = approx. 240 pixels wide.
7. Now, download the original image (sized 2048 * 1536 pixels) from flicker and measure the diameter on your screen in an appropriate imaging program. I find the measured diamter to be 230 pixels. Considering the various sources of error, this is in excellent agreement with "therory"!
Addendum:
Now, consider my K200D (or any DSLR with an APS-C sensor).
My pixel widths are 0.00606 milimeters and thus, with the same optcal system (1600 mm FL) my Jupiter image would be a lousy 60 pixels wide only - or, said in another way: In order to compete with the sensor resolution (very different from the lens' optical resolution) I would need an optical system with a FL of 6300 mm in order to compete with the image detail we are discussing here.
So, for planetary photography, small is indeed beautiful - but don't give up astrophotography with your K200D, K-x or K-r for that matter. Just choose the right subjects.