Olympus TG-860 has a 16.0MP (6.17 x 4.55 mm ) sized CMOS sensor and features TruePic VII processor. You can shoot at maximum resolution of 4608 x 3456 pixels with aspect ratios of 1:1, 4:3, 3:2 and 16:9. TG-860 has a native ISO range of 125 - 6400 but unfortunately, Olympus TG-860 doesn't have RAW file support. If you need a Compact camera with a RAW support, consider Nikon Coolpix P7800 or Leica Q (Typ 116) in the same price range.
Olympus TG-860 is not the highest resolution Small Sensor camera. Canon SX740 HS with its 21.0MP sensor is leading in this class. Check the comparison of Olympus TG-860 vs Canon SX740 HS or take a look at Highest resolution Waterproof cameras list.
Let's look at how the size of the Olympus TG-860's sensor compares with other standard sensor sizes.
Comparison image of Olympus TG-860 Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field Olympus TG-860 gives you at any given aperture.
You can
calculate
the exact depth of field for the Olympus TG-860
at any focal length, aperture and subject distance, including the hyperfocal distance
for landscapes and how close you can get before the focus zone becomes too thin.
