No, they don’t use cameras, they use lenses.
One of the basic rules: You can’t zoom out.
As far as the lens goes, if you want to have the best and most versatile camera of all time, then the Panasonic Lumix GX1 should be it, but we’ll focus on an alternative, the Canon G1 X.
What lenses does the G1 X use?
The GX1 is equipped with a 19.0-megapixel APS-C Full Frame CMOS sensor, providing the following capabilities:
Full frame resolution
Up to 536ppi pixel density (as opposed to the 1.5-megapixel sensor on the EOS-1D X.)
24-bit color (compared to 15-bit in all modern DSLRs)
Dynamic range of up to 1,200-red-green-blue (which is great, especially for daytime use, where natural colors such as red-green-blue are not always visible)
ISO 100-3,250,600 and 4,422,967-4,489,793,458 (up to 2666,800 in JPEG and 2.7x in RAW) in Full Frame with an ISO range of ISO100-3,250,600 in Full Frame with an ISO range of ISO100-3,250,600 in full-frame with an ISO range of ISO100-4,422,967-4,489,793,458 in full-frame, and ISO200-256,400 in Full Auto. In a side-by-side comparison, the Mamiya DF-X100 has a larger sensor of 2,036 ppi, which produces more accurate color and contrast and less noise, but in any event, it’s a little bigger, and uses a lower ISO (ISO3,250,600) and a lower ISO sensitivity (ISO200,200,200) as well.
The difference between the two cameras is really quite minimal. The only significant difference is the lens. The Fuji X100 has a 14.5-megapixel sensor, whereas the Canon G1 uses a 19.0-megapixel APS-C Full Frame CMOS sensor with an enhanced XF lenses and a wider f/2.0 aperture. For more detail on the differences, visit our Fujifilm lens comparison article, where I compare the two cameras with varying focal lengths.
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