Here is a quick comparison for the Nikon D3300 vs D3400 digital SLR cameras with APS-c sized image sensors.

The newly announced Nikon D3400 offers a 24-megapixel APS-C CMOS sensor.Previous model offers exactly the same resolution and size. So what may be the main differences when consider their specs list.

The Nikon D3400 is an entry-level digital SLR camera. The new model continues to offer an 11-point AF system. The device has a maximum ISO of 25,600, 12-bit RAW support. It has a 3″ rear screen with a resolution of 921,000 dots.

Nikon D3300 features a new 24.2 megapixel CMOS sensor with no optical low-pass filter and an “Expeed 4” image processor.
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http://www.dailycameranews.com/2016/08/nikon-d3300-vs-d3400/